Question

Which of the following is/are thermochemical equations?

• A. Lighting a candle
• B. Combustion of fuel
• C. Solution of sulphuric acid in water
• D. Respiration

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A

Lighting a candle

B

Combustion of fuel

C

Solution of sulphuric acid in water

D

Respiration

All of the given options expels heat upon reacting. Hence they all are thermochemical reactions. Lighting a candle is the burning up of oxygen releasing heat and light. Combustion of fuel also does the same thing. The energy is used to drive machinery. Adding sulphuric acid to water will react in a very violent reaction with the release of a large amount of heat and energy. Respiration is also a thermochemical reaction in which oxygen is used and carbon dioxide is released.