Give reasons why a tightly fitting metal cap is opened by heating slightly.

Give reason why amines are reactive?

Give reason. Why a finely divided substance is more effective as an adsorbent?

Give the reason why temperature of ice is lowered when salt is added to it ?

Give reasons why hybrid seeds are to be produced year after year.

(i) Give reason why phenol does not give protonation easily. (ii) Complete the following reaction. underset((A))("Benzene")overset(Ac_2O)underset(+AlCl_3)rarrBunderset((ii)H_3O^(+))overset((i)MeMgBr)rarrCunderset(H_2SO_4)overset("Conc.")rarrDunderset((ii)H_2O_2//OH^(-))overset((i)BH_3//"THF")rarrE

Give reason for the statement. Thermite process is used for the reduction of metal oxide.

Give reason for the statement. Gold is leached with NaCN to obtain the metal in solution as complex. Gold (Au) react with NaCN to give a complex. This complex react with Zn to give metal.