Question

Q6 Give reasons : -

(i) All decomposition reactions are endothermic reactions.

(ii) Photosynthesis is considered as an endothermic reaction.

(iii) An iron knife kept dipped in a blue copper sulphate solution turns the blue solution light green.

(iv) When carbon dioxide is passed through lime water, it turns milky.

(v) Hydrogen being a highly inflammable gas and oxygen being a supporter of combustion, yet water which is a

compound made up of hydrogen and oxygen is used to extinguish fire.​

Answer 1

Answer:

1) Decomposition reactions require energy (either in the form of heat, light or electricity) for breaking down the reactants. Hence, all decomposition reactions are endothermic.

2) Photosynthesis is an endothermic reaction because sunlight energy is absorbed by green plants during this process.

3) An iron knife kept dipped in blue copper sulphate solution changes to light green because iron being more reactive than copper displaces it from copper sulphate solution and forms iron sulphate

4) When carbon dioxide gas is passed through or over limewater, it turns milky due to the formation of calcium carbonate.

5) Hydrogen being a highly inflammable gas and oxygen being a supporter of combustion yet water which is a compound made up of hydrogen and oxygen is used to extinguish fire.

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