Question

Give reasons for the following:
1. Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.

2. Electrolytic decomposition of water is a reaction involving change of state.

3. A characteristic change of colour is seen when a piece of iron is added to copper (II) sulphate solution.

4. The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow [2] between the reactants & products, formed in the chemical reaction.

5. Silver salts are kept in dark coloured bottles.

PLEASE GIVE CORRECT ANSWER!
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Answer 1

Answer:

Solution:

1) Rusting of iron is a slow reaction and the heat evolved is very less, which is unnoticeable.

2) Electrolytic decomposition of water is due to the passage of electric current through it.

3) When iron is added to copper [II] sulphate solution, iron displaces copper from copper sulphate and forms ferrous sulphate which is pale green coloured and there is a reddish-brown deposit on copper.

4) The double arrow indicates that the reaction is reversible.

5) Silver nitrate is deposited in coloured bottles because it gets decomposed by sunlight.