Give reason for the following. i) Hydrogen is not evolved when metal reacts with nitric acid. ii) Metals like Na, K, and Ca are never found in their free state. iii) Oil and fat containing food items are flushed with nitrogen. iv) When an iron nail kept in copper sulphate solution, blue colour of the solution fades and iron nail becomes brownish.
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Explanation:
1)when metal react with nitric acid hydrogen get oxidized as a result water is formed so hydrogen will not be formed as nitric acid is an oxidizing agent
2) the metals given here are highly reactive as a result in free state they will react with the other elements in nature like Oxygen ,hydrogen etc to form it's relative oxide , hydroxide and all .
3)oil and fat containing food when kept in moist surroundings for a long period of time it will get oxidized that is , it will react with atmospheric oxygen and will get distroyed. so if we flush nitrogen into the container the process of oxidation will not take place as nitrogen will not allow the reaction to take place.
4) when iron nail kept in copper sulphate solution , iron which is a more reactive metal will displace copper (as it is a less reactive metal than iron)from the compound as a result the color of copper sulphate which is blue will turn into pale green due to the formation of iron sulphate. this is the reason for colour change
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