Tincture of iodine is a solution used as an antiseptic to clean wounds. This is prepared by dissolving solid iodine in:

(1) alcohol
(2) water
(3) carbon di sulphide
(4) ether

Which of the following statement is not correct 

(1) The latent heat of fusion of ice is 3.34 × 10⁵ Joule / kg. 
(2) Temperature of melting ice does not rise even though heat is continuously supplied. 
(3) Latent heat of vaporisation of water is 30.4 × 10⁵ Joule / kg. 
(4) All of the above

The dyes of an ink can be separated by.. . . .

(1) filteration
(2) sublimation
(3) fractional distillation
(4) chromatography

If three gases X, Y, Z are arranged in increasing order of their relative molecular mass and the mass of each gas is 10 g at S.T.P state, which gas will contain the least number of molecule and which the most ?

(1) X least and Y maximum 
(2) X maximum and Z least 
(3) Y maximum and Z least 
(4) Y least and Z maximum