Question
Two reactions, M and N, both form carbon dioxide.
$\mathrm{CaCO}_3 \stackrel{\mathrm{M}}{\longrightarrow} \mathrm{CO}_2 \stackrel{\mathrm{N}}{\longleftarrow} \mathrm{CH}_4$
Which types of reaction are M and N?
▶️Answer/Explanation
Ans:B
Question
Which row describes two uses of sulfur dioxide?
▶️Answer/Explanation
Ans:B
Question
Which statement about lime and limestone is correct?
A Calcium oxide is formed from limestone in a displacement reaction.
B Lime is used to treat alkaline soils.
C Limestone is a waste material in the manufacture of iron.
D Slaked lime is used in the process of flue gas desulfurisation.
▶️Answer/Explanation
Ans:D
Question
A white solid Z reacts with dilute hydrochloric acid to produce a gas.
The same gas is produced when compound Z is heated strongly.
What is Z?
A calcium
B calcium carbonate
C calcium hydroxide
D calcium oxide
Answer/Explanation
Ans: B