Question

Give one example of each reaction when the following change takes place.
a) Evolution of gas
b) Release of heat
c) Change of state
d) Precipitate formation
e) Absorption of energy.​

Answer 1

Answer:

c. ice to water

e ice to water .

Answer 2

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i) 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.