Question

2. Salt obtained both from the sea as well as from a lake of salty water have the
same composition.​

Answer 1

So a few lakes are salty because rivers carried salts to the lakes, the water in the lakes evaporated and the salts were left behind. After years and years of river inflow and evaporation, the salt content of the lake water built up to the present levels. The same process made the seas salty.

Answer 2

On salt obtain from sea is different from lake