Question bank
Chapter-1 Matter
Q-1 State True and False
(1) LPG means liquefied petroleum gas
(2) Solid changes into liquid; this is called fusion
(4) The zig-zag motion of gas particles is called spreading motion.
(5) Matter can change from one form to another on changing temperature and pressure.
(3) In gaseous state, the interparticles space are very less
Q-2 Long answer type questions
(1) Write the three differences between solid, liquid and gaseous state.
(2) Explain the kinetic theory of matter.
(3) What do you mean by the change of state? Write the flow chart showing the complete cycle of change of state
(4) Describe an experiment to demonstrate that a substance absorbs heat during melting without change in its temperature.
Q-3 Very short answer type questions
(2) What is melting point?
(3) Out of solid, liquid and gas, which state of matter has the least kinetic energy?
(5) What is Brownian motion?
(1) A gas exerts pressure on the walls of the container. Why?
(4) What is solidification?
Q-4 Fill in the blanks
(2) Solid is very difficult to ________.
(3) ________ have no definite shape.
(4) The change of liquid to gas is called ________.
(5) The process in which solid directly changes into gas is called ______.
(1) The change of state from solid to liquid is called ________.
Q-5 Short Answer Type Questions:
(4) A substance has no mass. Can we regard it as matter?
(1) Write the three characteristics of solid.
(2) Explain Brownian motion
(3) Write the kinetic theory of matter
(5) Give the reason: Naphthalene balls disappear with time without leaving any solid.
Q-6 Long answer type questions
(1) Write the three differences between solid, liquid and gaseous state.
(2) Explain the kinetic theory of matter.
(3) What do you mean by the change of state? Write the flow chart showing the complete cycle of change of state
(4) Describe an experiment to demonstrate that a substance absorbs heat during melting without change in its temperature.
Multiple Choice Questions
Q-1 Which of following is not a matter?
(i)
Air(ii)
Copper sulphate(iii)
Chair(iv)
Vaccum
Q-2 When a substance changes from a solid to a liquid, it is called :
(i)
Melting
(ii)
Boiling(iii)
Sublimation(iv)
CondensationQ-3 Which of the following states of matter possess fluidity?
(i)
Solid, liquid(ii)
Solid, gas(iii)
Liquid, gas(iv)
All of these
Q-4 Which of the following type of matter has the weakest interparticle forces of attraction?
(i)
Steam(ii)
Iron(iii)
Sand
(iv)
MilkQ-5 Which of the following states of matter possess fluidity?
(i)
Solid, liquid(ii)
Solid, gas(iii)
Liquid, gas(iv)
All of these
Q-6 The temperature at which liquid changes into solid:
(i)
Boiling point(ii)
Melting point(iii)
Freezing point
(iv)
Latent pointChapter-2 Physical and Chemical changes
Q-1 State True and False
(1) Cooking of rice is a physical change
(2) Breaking of a china dish is a chemical change
(3) Cutting of wood into pieces is a chemical change.
(4) Rusting of iron is an irreversible change
(5) Eruption of a volcano is a reversible change.
Q-2 Fill in the blanks
(1) Changes in which the formation of new substances takes place are called ________.
(2) Melting of ice is a ________ change.
(3) Burning of wood is a ________ change
(4) Revolution of the Earth around the Sun is a ________ change
(5) A small plant changes into a tree is a ________.
Q-3 Long answer type questions
(1) When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both chemical and physical change take place.
(2) Give four differences between physical and chemical changes.
(3) What happen when magnesium oxide is dissolved in water? Write a word equation for this process. Name the type of change which takes place
Q-4 Very short answer type questions
(1) What are slow changes?
(2) Write the three examples of physical change
(3) What kind of change is shown by tearing of paper?
(4) Give one example of physical change which occurs by the action of heat.
(5) What is a chemical change?
Q-5 Short answer type questions
(4) Write the three characteristics of physical changes.
(1) State one instance where water undergoes a physical change and one in which it undergoes a chemical change
(2) How would you show that the setting of curd is a chemical change?
(3) Explain why burning wood and cutting something into small pieces are considered two different types of changes.
(5) Write the three characteristics of chemical changes.
Multiple Choice Questions
Q-1 Rusting of iron is a ________.
(i)
periodic process(ii)
fast process(iii)
natural process
(iv)
reversible processQ-2 When ice melts into water what types of changes do you observe?
(i)
Physical changes
(ii)
Chemical changes(iii)
Irreversible changes
(iv)
None of theseQ-3 Which of the following changes can be reversed?
(i)
Raw egg to boiled egg(ii)
Wet clothes to dry clothes
(iii)
Bud to flower(iv)
Cow dung to biogasQ-4 A chemical change may bring:
(i)
evolution of gas(ii)
change in colour(iii)
change in taste(iv)
All of these
Q-5 Which one of the steps while burning a candle is not reversible?
(i)
Melting of solid wax(ii)
Liquid wax changes to vapou(iii)
Wax vapour burns into flame
(iv)
All of theseQ-6 A chemical change may bring:
(i)
evolution of gas(ii)
change in colour(iii)
change in taste(iv)
All of these
Chapter-3 Elements and Compounds
Q-1 State True and False
(1) A pure substance has a fixed melting and boiling point.
(2) compounds are pure substances .
(3) Separation of components of a mixture is a useful process.
(4) Nitrogen molecule is formed by mutual sharing of electrons.
(5) Tap water and pond water are alike
Q-2 Short answer type questions
(1) What is the use of alum in loading?
(2) What is the use of decantation?
(3) How will you separate a mixture of sand and salt?
(4) Write short notes on : (i) Distillation (ii) Sieving (iii) Sublimation
(5) Explain diffusion.
Q-3 Very short type answer questions
(1) What substance is used for loading the clay particles suspended in muddy water?
(2) By which method is sugar separated from wheat flour?
(3) Name the method used in separate cashewnut of different size.
(4) Write the opposite process of condensation
(5) Name the process used to recover salt from sea water.
Q-4 Long answer type questions
(1) Explain the fractional distillation with an example
(2) Explain the filtration with an example
(3) Suggest a suitable technique to separate constituents of the following mixtures. Also, give reason for selecting the particular method. (a) Iron from sulphur (b) Chalk powder from water
Q-5 Fill in the blanks
(1) Symbol of gold ________.
(2) Compounds have ________ melting points .
(3) Sugarcane juice is a mixture of ________, water and many other substances.
(4) Separation of components is done to obtain a ________ substance.
(5) Boiling point of pure water is ________ than that of impure water.
Q-6 Very short type answer questions
(1) What substance is used for loading the clay particles suspended in muddy water?
(2) By which method is sugar separated from wheat flour?
(3) Name the method used in separate cashewnut of different size.
(4) Write the opposite process of condensation
(5) Name the process used to recover salt from sea water.
Q-7 Short answer type questions
(1) What is the use of alum in loading?
(2) What is the use of decantation?
(3) How will you separate a mixture of sand and salt?
(4) Write short notes on : (i) Distillation (ii) Sieving (iii) Sublimation
(5) Explain diffusion.
Multiple Choice Questions
Q-1 Chromatography is based on:
(i)
adsorption(ii)
Diffusion(iii)
filtration(iv)
Adsorption
Q-2 Which one of the following is not a method of separating mixture?:
(i)
Threshing(ii)
Sieving(iii)
Loading
(iv)
WinnowingQ-3 Which method is used to separate pebbles and stones from sand?
(i)
Handpicking(ii)
Winnowing(iii)
Sieving
(iv)
All of theseQ-4 A solid is dissolved in water. Which one of the following methods can be used to separate it?
(i)
Filtration
(ii)
Hand-picking(iii)
Magnet(iv)
SievingQ-5 Chromatography is based on:
(i)
adsorption(ii)
Diffusion(iii)
filtration(iv)
Adsorption
Q-6 The components of a solution (common salt in water) can be separated by :
(i)
filtration(ii)
evaporation
(iii)
sedimentation(iv)
decantationChapter-4 Atomic structure
Q-1 Fill in the Blanks:
(1) An ion which has a negative charge is called a ..................
(2) The mass of hydrogen atom ................. g.
(3) Isotopes of an element differ in the number of .................. in their nucleus.
(4) The outermost shell of an atom is known as .................
(5) Neutrons are ............... particles having mass equal to that of protons.
Q-2 Short answer type questions
(2) Why was Thomson’s atomic model compared with a watermelon?
(4) How was neutron discovered by James Chadwick?
(1) How will you represent the fundamental particles, electrons, protons and neutrons?
(3) Write the comparative mass of electron, proton and neutron.
(5) Write the definition of atomic number and mass number
Q-3 State True and False
(1) Thomson proposed that the nucleus of an atom consists proton and neutrons
(2) An electron has a mass that is much less than a proton.
(3) An atom on the whole as neutral.
(4) The maximum number of electrons in the first shell can be 8.
(5) α-particles are the same as helium atom
Q-4 Fill in the Blanks:
(1) An ion which has a negative charge is called a ..................
(2) The mass of hydrogen atom ................. g.
(3) Isotopes of an element differ in the number of .................. in their nucleus.
(4) The outermost shell of an atom is known as .................
(5) Neutrons are ............... particles having mass equal to that of protons.
Q-5 Very short answer type questions
(1) What are cathode rays?
(2) How many times is a neutron heavier than an electron?
(3) What are Rutherford’s experiment and atomic model called?
(4) In an atom, which shell has the least energy?
(5) What are anode rays?
Q-6 Long answer type questions
(1) Explain the Bohr’s atomic model
(2) Explain Rutherford’s model of is atoms and write observation and conclusion of a-ray scattering experiment.
(3) Compare and contrast Rutherford's and Bohr's model of atom.
Multiple Choice Questions
Q-1 Atomic number is equal to
(i)
Number of protons in the nucleus of an atom
(ii)
Number of neutrons in atom(iii)
Number of electrons and neutrons(iv)
Number of protons and neutrons
Q-2 The number of valence electrons present in sodium is
(i)
One
(ii)
two(iii)
three(iv)
zeroQ-3 The sub-atomic particle with positive charge is
(i)
Proton
(ii)
Neutron(iii)
Electron(iv)
NucleonQ-4 What was the conclusion drawn by Thomson after his experiment on cathode ray?
(i)
Atoms consist of protons and neutrons inside the nucleus(ii)
Atoms consist of electrons
(iii)
Atoms consist of electrons, protons and neutrons(iv)
Atoms consist of electrons in continuous motion around the positively charged spherical massQ-5 The sub-atomic particle with positive charge is
(i)
Proton
(ii)
Neutron(iii)
Electron(iv)
NucleonQ-6 An alpha particle is also known as ................ .
(i)
Subatomic particle(ii)
an unionised helium atom
(iii)
a neutral particle(iv)
a doubly charged helium ionChapter-5 Language of chemistry
Q-1 Fill in the blanks
(1) A chemical equation provides information on the ________ of the substance and the reaction condition
(2) The symbol “aq” in a chemical equation represents the physical state of the substance as ________.
(3) Reaction in which heat is absorbed is represented by ________ sign.
(4) Unbalanced equation is known as ________.
(5) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called ________.
Q-2 Long answer type questions
(1) Explain the modern concept of valency?
(2) Copper having electronic configuration 2, 8, 18, 1 that exhibits variable valency. Give a reason for the same & name the compounded CuCl & CuCl2 .
(3) State information provided by a chemical equation. Chemical equations suffer from a number of limitations. State main limitations of a chemical equation.
Q-3 State True and False
(1) In a chemical equation, the products are written on the right-hand side.
(2) A chemical equation can be balanced easily by altering the formula of a reactant or product.
(3) A balanced chemical equation obeys the law of conservation of mass.
(4) Na+ is a anion.
(5) Down arrow (¯) indicates gas evolved.
Q-4 Long answer type questions
(1) Explain the modern concept of valency?
(2) Copper having electronic configuration 2, 8, 18, 1 that exhibits variable valency. Give a reason for the same & name the compounded CuCl & CuCl2 .
(3) State information provided by a chemical equation. Chemical equations suffer from a number of limitations. State main limitations of a chemical equation.
Q-5 Very short answer type questions
(1) What is symbol of an element?
(3) Give an example of exothermic reaction.
(5) What is atomic mass?
(2) What is a chemical equation?
(4) What is molecular formula of a compound?
Q-6 Short answer type questions
(3) Balance the following chemical equations : (i) H2 + N2 - NH3 (ii) MnO2 + HCl - MnCl2 + Cl2 + H2 O
(5) Write a short note on radicals.
(1) Write the characteristics of a chemical equation
(2) Write the definitions of the following : (i) Reactant (ii) Balanced chemical equation
(4) Write the notation used for representing: (i) a precipitate (ii) a gas (iii) a liquid
Multiple Choice Questions
Q-1 Chemical symbol of potassium is :
(i)
PO(ii)
K
(iii)
Si(iv)
ClQ-2 Chemical symbol of potassium is :
(i)
PO(ii)
K
(iii)
Si(iv)
ClQ-3 The chemical symbol for nitrogen gas is :
(i)
Ni(ii)
N(iii)
N+(iv)
N2
Q-4 The combining capacity of electron in compound formation is called :
(i)
Cation(ii)
Anion(iii)
Valency
(iv)
Oxidation numberQ-5 Out of these which one is cupric ?
(i)
Cu(ii)
Cu+(iii)
Cu0(iv)
Cu2+
Chapter-6 Chemical Reactions
Q-1 State True and False
(1) The number of atoms of each element is conserved in any chemical reaction.
(2) Hydrogen sulphide has a rotten egg smell.
(3) Rusting of iron is a fast reaction
(4) The reaction between hydrogen and chlorine is an example of combination reaction.
(5) A black residue is formed when sugar is heated
Q-2 Fill in the blanks
(1) Magnesium ribbon burns in the air on heating with the formation of a white powder called ________.
(2) The substances which undergo chemical change are called ________.
(5) Unbalanced reaction is also known as ________.
(3) AgNO3 + NaCl → AgCl + ________
(4) Decomposition of potassium chlorate on heating in the presence of manganese dioxide is called________.
Q-3 Long answer type questions
(2) Complete and balance the following : (i) CaCO CO ----------->Heat _______ + CO2. (ii) Zn + H2 SO4 ------------> ZnSO4 + .............
(1) What do you observe when : (i) Phenolphthalein is added to NaOH solution? (ii) Red litmus paper is dipped in NaOH?
(3) Give reasons for the following: (i) Burning a paper is a chemical change (ii) Freezing of water to ice and evaporation of water are physical changes.
Q-4 Very short answer type questions
(2) What is metal reactivity series?
(5) Give two examples of enzyme.
(1) What is neutralisation?
(3) What are oxides?
(4) What do you mean by catalyst?
Q-5 Short answer type questions
(5) Define exothermic reaction with an example.
(1) What do you mean by precipitation? Give one example
(2) Write the definitions of the following with one example each : (i) Addition reaction (ii) Decomposition reaction (iii) Displacement reaction (iv) Double displacement reaction
(3) Write the importance of metal reactivity series
(4) Write the definitions of the following with one example each : (i) Acidic oxide (ii) Basic oxide (iii) Amphoteric oxide (iv) Neutral oxide
Multiple Choice Questions
Q-1 Pb + CuCl2 ---------------> PbCl2 + Cu . The above reaction is an example of :
(i)
Combination reaction(ii)
Decomposition reaction(iii)
Displacement reaction
(iv)
Photochemical reactionQ-2 The chemical formula of magnesium oxide is :
(i)
MgO
(ii)
MgO2(iii)
Mg2 O(iv)
Mg(OH)2Q-3 Which of the following processes does not produce decomposition reaction?
(i)
Electrolysis(ii)
Exposure to light(iii)
Distillation
(iv)
ThermalQ-4 A substance ‘X’ is used in whitewashing and is obtained by heating limestone in the absence of air. Identify ‘X’.
(i)
CaOCl2(ii)
Ca(OH)2(iii)
CaO
(iv)
CaCO3Q-5 Out of these, which one is amphoteric oxide?
(i)
MgO(ii)
Na2 O(iii)
SO2(iv)
Al2 O3
Chapter-7 Water
Q-1 Very short answer type questions
(1) What is the freezing point of water?
(2) How much amount of water is found in human blood
(3) Name the four main sources of water.
(6) Why is water a universal solvent?
(5) Explain the state of water.
(4) What is surface water?
Q-2 State True and false
(1) Oceans are the major sources of drinking water.
(2) Our body contains 90% water
(3) The groundwater is actually the rainwater.
(4) Anhydrous substances use a drying agents
(5) Permanent hardness of water can be removed by boiling of water.
Q-3 Long answer type questions
(3) Explain the following terms : (i) Brownian movement (ii) Tyndall effect (iii) Crystallisation
(1) What happens when : (i) Coke reacts with water at 100°C. (ii) Calcium oxide reacts with water. (iii) Nitrogen pentaoxide reacts with water.
(2) Write the differences between suspension and colloidal solution.
(4) Explain water pollution and write the causes of water pollution.
(5) Explain the water cycle.
Q-4 Fill in the blanks
(1) Large part of the Earth’s surface is covered by ________.
(2) Water has maximum density at ________ temperature.
(3) Water has maximum density at ________ temperature.
(4) Boiling removes the ________ hardness of water.
(5) Water can exist in ________ states.
Q-5 Short answer type questions
(1) Write the five benefits of water
(2) Why is water very precious for all living beings?
(3) Explain H2 O as a compound.
(4) Explain the anomalous expansion of water for aquatic plants and animals.
(5) Why does ice float on water?
Multiple Choice Questions
Q-1 Plants release a large amount of water vapour into the atmosphere by the process called
(i)
evaporation(ii)
condensation(iii)
precipitation(iv)
transpiration
Q-2 Circulation of water between ocean and land is known as :
(i)
water cycle
(ii)
rain cycle(iii)
water management(iv)
water harvestingQ-3 Which one is the purest form of water?
(i)
River water(ii)
Groundwater(iii)
Rainwater
(iv)
Ocean waterQ-4 The percentage of water in a human being is :
(i)
88(ii)
75(iii)
70
(iv)
95Q-5 Temporary hardness of water can be removed by :
(i)
filtering(ii)
boiling
(iii)
loading(iv)
sedimentationChapter-8 Hydrogen
Q-1 Fill in the blanks
(1) Hydrogen is the first and ________ element
(2) Hydrogen constitutes about ________ per cent by weight of the Earth’s crust
(3) Iron reacts with hydrochloric acid to produce ________ with hydrogen gas.
(4) Water gas is a mixture of hydrogen and ________.
(5) Reduction is the addition of hydrogen or ________ element.
Q-2 Long answer type questions
(2) Explain the commercial preparation of dihydrogen by Bosch process.
(4) . Complete and balance the following equations : (i) H2 + Cl2 -----------> ............... (ii) H2 + S ------------>............... (iii) 2 1100 C CH4 C ---------------> ............... (iv) Fe3 O4 + 4H2 -------------> ............... + 4H2 O
(1) Describe the preparation of dihydrogen in the laboratory
(3) Explain the electrolysis of water
(5) Write any four uses of hydrogen.
Q-3 Very short answer type questions
(1) Write the names of three isotopes of hydrogen.
(2) What is oxidation?
(3) Write the two examples of non-electrolytes.
(4) What is hard water?
(5) Which gas is produced when sodium reacts with sulphuric acid?
Q-4 State True and false
(1) Hydrogen is a diatomic molecule
(2) Concentrated nitric acid can be used for the preparation of dihydrogen
(3) Rancid foodstuff changes the smell and taste.
(4) Hydrogen is a oxidising agent.
Q-5 Short answer type questions
(1) What happen when zinc reacts with sodium hydroxide?
(2) Give reasons for the following. (i) Hydrogen can be used as a fuel. (ii) Nitric acid is not used for the preparation of dihydrogen.
(3) Write any three physical properties of dihydrogen.
(4) Give answers of the following : (i) Name two metals which give hydrogen with cold water. (ii) The process in which oxygen is added or hydrogen removed
Multiple Choice Questions
Q-1 The metal which gives hydrogen on treatment with acid as well as NaOH is-
(i)
Fe(ii)
Cu(iii)
Zn(iv)
HgQ-2 The metal which reacts with cold water to produce hydrogen is :
(i)
magnesium(ii)
aluminium(iii)
calcium(iv)
ironQ-3 Hydrogen is used for producing-
(i)
heat and light(ii)
hydrogenated oil(iii)
fertilizers(iv)
All of the aboveQ-4 When H2 reacts with Na, it acts as
(i)
oxidising agent(ii)
reducing agent(iii)
precipitating agent(iv)
none of theseQ-5 The metal which gives hydrogen on treatment with acid as well as NaOH is-
(i)
Fe(ii)
Cu(iii)
Zn(iv)
HgQ-6 Equal volume of hydrogen gas and chlorine gas is exposed to diffused sunlight to prepare-
(i)
hydrogen chloride(ii)
Water(iii)
water gas(iv)
sodium hydroxideChapter-9 Carbon and its compounds
Q-1 State True and false
(1) Graphite is a crystalline form of carbon
(2) Carbon is the fifth most abundant element in the universe.
(3) The allotropes of the same element have different physical properties but may have the same chemical properties.
(4) Water gas is a mixture of carbon monoxide and hydrogen.
(5) Activated Charcoal is a good conductor of heat and electricity
Q-2 Very short answer type questions
(1) What is catenation?
(2) Name one crystalline allotrope of carbon
(3) What is destructive distillation?
(4) Write the uses of lamp black
(5) What is carbonisation?
(7) Why is carbon monoxide considered as a poisonous gas?
(6) Write the industrial uses of CO2 .
Q-3 Fill in the blanks
(1) Diamond and graphite are ________ forms of carbon
(2) Lamp black, charcoal and coal are examples of ________ allotropic forms of carbon.
(3) Lack of oxygen and excess of carbon dioxide in the blood causes ________.
(4) In Buckminsterfullerene, carbon atoms are held together by ________ bonds.
(5) All carbonates upon reaction with dilute acids give ________.
Q-4 Short answer type questions
(1) What is meant by the term 'fullerenes'?
(2) Give four physical properties of graphite
(3) How is wood charcoal made?
(4) State the poisonous nature of carbon monoxide.
Q-5 Long answer type questions
(1) Write equations to show the reaction of carbon dioxide with: (a) H2 O (b) Ca(OH)2 (c) Mg (d) K2 O (e) NaOH
(2) Write any two methods used for preparing CO2 . Write two uses as well
(3) Write the uses of the following: (a) Diamond (b) Lamp black (c) Charcoal (d) Graphite (e) Soot
(4) Describe the formation of coal. Explain the four types of coal in brief.
Multiple Choice Questions
Q-1 Destructive distillation of coal yields:
(i)
coal tar(ii)
coke(iii)
coal gas(iv)
all of the aboveQ-2 Which of the following allotropes of carbon is an electrode?
(i)
Graphite(ii)
Coke(iii)
Diamond(iv)
CharcoalQ-3 Which of the following is produced on burning carbon?
(i)
Carbon monoxide(ii)
Oxygen(iii)
None of these(iv)
Carbon dioxidQ-4 Buckminsterfullerene is the allotropic form of:
(i)
Phosphorus(ii)
Carbon(iii)
Nitrogen(iv)
Sulphur