Chemistry — Practice

Question 1

Which of the following is an example of a chemical change?

Accepted Answer

C

Question 2

An atom of an element has atomic number 11 and mass number 23. The number of neutrons in this atom is

Accepted Answer

B

Question 3

Calcium (valency 2) combines with chlorine (valency 1) to form calcium chloride. The correct chemical formula is

Accepted Answer

C

Question 4

Elements in the same group of the modern periodic table have the same number of

Accepted Answer

D

Question 5

Which of the following elements is classified as a metalloid, showing properties of both metals and non-metals?

Accepted Answer

B

Question 6

Brass, commonly used for utensils and decorative fittings, is an alloy of

Accepted Answer

B

Question 7

Sodium chloride (NaCl) is formed by

Accepted Answer

B

Question 8

The reaction CaCO₃ →(heat) CaO + CO₂ is an example of a

Accepted Answer

A

Question 9

Which of the following is the correctly balanced equation for the reaction of magnesium with hydrochloric acid?

Accepted Answer

B

Question 10

An iron nail placed in a copper sulphate (CuSO₄) solution turns the blue solution pale green and gets coated with a reddish-brown deposit. This happens because

Accepted Answer

B

Question 11

Which of the following pH values represents the most strongly acidic solution?

Accepted Answer

D

Question 12

Phenolphthalein indicator turns pink when added to

Accepted Answer

C

Question 13

Baking soda, commonly used in antacids and as a leavening agent, has the chemical formula

Accepted Answer

B

Question 14

CNG (Compressed Natural Gas), widely used as a cleaner automobile fuel, consists mainly of

Accepted Answer

B

Practice — Chemistry

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