Rekha observed that her mother placed shrinked or dried vegetables in water before cutting these for cooking. After sometime, these vegetables looked fresh.
Answer the following questions:
(i) Why did Rekha's mother place the shrinked or dried vegetables in water?
(ii) What is the name of the process used and define it.
(iii) Would the temperature increase accelerate the process or not?

Many food products are available in the market in tin cans. Jayant went to the market to buy tinned cans of a food product. The shopkeeper gave him a can which had scratches, though it had been recently packed. Jayant did not buy that can. How do you agree with Jayant's decision?

In thermal power stations, coal is burnt to produce steam for generation of electricity The smoke produced is passed through electrostatic precipitators before allowing it to escape into the atmosphere

Account for the following:
(i) Iron on reaction with HCI forms FeCl₂ and not FeCI₃.
(ii) Draw structure of XeO_3.

D.D.T is one of the most powerful insecticides which is effective against the mosquitoes that spread malaria. Mukesh's mother wanted to buy D.D.T from the market to use at night to protect her family from mosquitoes. But Mukesh stopped his mother from purchasing D.D.T.
(a) How did Mukesh convince her mother for not using D.D.T at night?
(b) What values are attached to suggestion of Mukesh?