MCQ Questions

Question No. 1

Ammonia can form a coordinate covalent bond with a hydrogen ion to form NH₄⁺

Answer :

(a) Give the Lewis diagram for the NH₃ molecule.

(b) Refer to the Lewis structure of NH₃and state why it can form a coordinate covalent bond with the H⁺ ion.

(c) Draw Lewis diagrams to show the reaction between NH₃ and a H⁺ ion.

Question No. 2

Give the IUPAC names of the following compounds:

Answer :

(a) K₂O

(b) NaHCO₃

(c) H₃PO₄

Question No. 3

Give the conventional names of the following compounds:

Answer :

(c) NH₄Br

(a) MgCO₃

(b) NaCl

(d) MgSO₄

Give the IUPAC names of the following compounds:

Question No. 4

Copy the blank Periodic Table in your book and fill in

Answer :

(a) the first 20 elements and their atomic numbers

(b) the group numbers.

Question No. 5

Give a brief description of the following states:

Answer :

(a) Gaseous

(b) Liquid

(c) Solid

Question No. 6

Give the formula of the following compounds:

Answer :

(a) Calcium trioxocarbonate(IV)

(b) Sodium trioxophosphate(III)

(c) Potassium oxide

(d) Dihydrogen oxide

Question No. 7

Answer the following question.

Answer :

(1) Give the main differences between the properties of covalently bonded substances and ionic substances.

(2) State the kinetic theory of matter.

(3) Explain in your own words what happens when water molecules change phase from a solid to a liquid state.

Question No. 8

This question is about the Periodic Table of elements. The letters shown in the table are not the symbols of the elements. Use only the letters given in the table where necessary to answer the questions.

Answer :

(a) How many protons are there in an atom of element K?

(b) Name the element that forms ions with a single negative charge.

(c) Name the element that has its electrons arranged in four energy levels.

(d) How many electrons are there in an atom of element J?

(e) Name the element that has the lightest atoms.

(f) Give the elements of Group 1.

(g) Name the element that has three valence electrons.

(h) Give the group number to which element K and L belong.

(i) State why the electron configuration of K and L are important.

Question No. 9

Use Lewis diagrams to show how the following molecules are formed from atoms:

Answer :

(a) Cl₂

(b) CS₂

Question No. 10

³⁵X₁₇ is an unknown element.

Answer :

(a) Draw an electron shell diagram of element X.

(b) Give the electron configuration of element X.

(c) List the number of protons, neutrons and electrons in a neutral atom of X.

(d) Name the element.

Question No. 11

Name the type of intermolecular forces that exist between molecules/basic units in each of the following substances:

Answer :

(a) MgO

(b) NaCl

(c) H₂O and H₂O

(d) HF and HF

(e) C and C

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