A freshly cut apple is almost white but it turns reddish brown after sometime. Give reason.

On keeping iron nails in a blue coloured copper sulphate solution, it is observed that the colour of the solution turns light green after sometime. Give reasons for this colour change. Name the type of reaction.

Why does the light green colour of a freshly prepared aqueous solution of ferrous sulphate becomes reddish-brown after some time ?

Sometimes exploson occurs during distillation of ether sample. Give the reason.

During cold nights, sometimes dew is formed. Give reason

Ordinary rubber filled with hydrogen get deflated after sometimes. Assign reason.

When copper turnings are added to silver nitrate solution, a blue coloured solution is formed after sometime. It is because, copper