MCQ Questions

Question No. 1

Give one term for each description.

Answer :

(a) The study of carbon compounds

(b) Atoms of elements that form different molecular forms

(c) The hardest known natural mineral

(d) The burning of fossil fuels releases excess carbon dioxide into the atmosphere that can cause this global phenomenon

(e) The class of hydrocarbons that has one or more benzene rings

(f) The main component of natural gas

Question No. 2

Name the processes labelled A, B and C in the diagram below.

Answer :

Question No. 3

Name the compounds below.

Answer :

Question No. 4

Fossil fuels are the main source of energy on Earth.

Answer :

(a) Name three fossil fuels.

(b) Why are fossil fuels non-renewable?

(c) Describe the formation of fossil fuels.

(d) Name the process whereby plants store energy from sunlight.

(e) Name the process whereby energy stored in fossil fuels is released through burning.

(f) What substance is needed for the previous process to take place?

Question No. 5

The compounds in crude oil are separated in a refinery by means of the apparatus shown in the diagram.

Answer :

(a) What is the name of the apparatus?

(b) What is the name of the process that is used to separate the compounds in crude oil?

(c) Which physical property of the compounds in the mixture is usedfor the separation?

(d) Use the letters A to E to describe where the following could be found:

i) The fraction that represents gases
ii) The fraction with the largest molecules
iii) The fraction that represents liquids with the lowest boiling point
iv) The fraction that is used to tar roads
v) The fraction used as diesel
vi) The fraction used as petrol
vii) The fraction that is used to make candles
viii) The fraction that is used as domestic kerosene

Question No. 6

Calcium carbonate can decompose in a kiln at high temperatures.

Answer :

(a) Give one common name for calcium carbonate.

(b) Write a balanced equation for this reaction.

(c) Give the name and formula for clear limewater.

(d) What compound causes the milky colour in limewater?

(e) Which gas causes a positive result in limewater?

Question No. 7

You want to investigate what happens when vinegar is poured onto baking soda. Your teacher supplies baking soda (NaHCO3 ), vinegar (CH3COOH) and universal indicator. Below is a diagram of the experimental apparatus.

Answer :

(a) Vinegar is an acid and its pH is around 3. What will be the colourof the universal indicator in vinegar?

(b) The baking soda reacts with the vinegar in a neutralisation reaction. Will the pH of the reaction mixture increase or decrease as more baking soda is added to the vinegar?

(c) The colour of the universal indicator finally turns green. What is the final pH of the solution?

(d) Explain what the word ‘neutralise’ means.

(e) Write a balanced equation for the reaction.

Question No. 8

Match the statements in Column A with the correct answer in Column B.

Answer :

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