A hydrogen baloon expands as it goes up in the air. Give reasons in one sentence.

H_2O is a liquid while hydrogen sulphide is a gas at room temperature. Give reasons.

The paramagnetic character in 3d- transition series increases up to maganese and then decreases. Give reason.

On heating a compound A gives compound 'B' which is a constituent of air. This gas when heated with hydrogen in presence of iron catalyst gives gas 'C' which is basic in nature. Gas C on oxidation in moist condition gives compound 'D' which is constituent of acid rain. Identify A, B, C,D and give necessary equation.

Synthetic clothes dry up quicker than cotton clothes / Give reasons.

On heating compound A gives a gas B which is a constituent of air. This gas when treated with 3 moles of hydrogen (H_(2)) in the presence of a catalyst gives another gas C which is basic in nature. Gas Con further, oxidation in moist condition gives a compound D which is a part of acid rain. Identify compounds A to D and also give necessary equations of all the steps involved.

For creating one recombinant vector only one type of restriction endonuclease is required.Give reason.

Consider the following statements each one or two blanks (A) Lippes loops is a overset("i")"___" while multiload 375 is a overset("ii")"___" IUD (B) Surgical methods of contraception are also called as overset("iii") "___" methods (C) High MMR and IMR play a significant role in overset("iv") "____" human population Which one of the following options, gives the correct fill ups for the respective blank numbers from (i) to (iv) in the above statements ?