Question

Give an example of chemical reaction characterized the change in temperature.

Answer 1

Answer:

Evolution of gas--- Reaction between zinc and dilute sulphuric acid

ii) Change in color--- Reaction between citric acid and purple colored potassium permanganate solution gives colourless solution.

iii) Formation of precipitate--- Reaction between potassium iodide and lead nitrate forms a yellow precipitate of lead iodide.

iv) Change in temperature: Reaction between zinc granules and dliute hydrochloric acid.

v) Change in state: Combustion of candle wax is characterized by a change in state from solid to liquid and gas

Explanation:

Answer 2

$Zn(s) + H_2SO_4(aq) -------->ZnSO_4(aq) + H_2(g)$

When dilute sulphuric acid is added to Zinc heat is evolved.

And hence it is type of a change in temperature.