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Question

Observing the changes, in which of the following would you say a chemical reaction may be occurring?

A
Heating iodine changes its colour from bluish black to purple
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B
Mixing ammonia and hydrogen chloride gases gives fumes containing a white powdery substance
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C
Mixing an acid and a base solution raises the temperature
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D
Mixing ferrous sulphide and hydrochloric acid gives off a gas with a rotten egg smell
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Solution

The correct options are
A Heating iodine changes its colour from bluish black to purple
B Mixing ammonia and hydrogen chloride gases gives fumes containing a white powdery substance
C Mixing an acid and a base solution raises the temperature
D Mixing ferrous sulphide and hydrochloric acid gives off a gas with a rotten egg smell
The given processes involve:
(i) colour change
(ii) change of state
(iii) change in temperature
(iv) release of a gas

These are the characteristics of a chemical reaction. Therefore, all four of the given processes may be chemical reactions.

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