The p -Block Elements

The reaction of NO with N?O? at 250 K gives:

The volume strength of 8.9M H?O? solution calculated at 273 K and 1 atm is (R = 0.0821 Latm K?¹ mol?¹) (rounded off to the nearest integer)
(p-block)

If the boiling point of H?O is 373 K, the boiling point of H?S will be:

On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with H? in the presence of a catalyst gives another gas (C) which is basic in nature. (A) should not be:

When gypsum is heated to $393\mathrm{K}$ $$ , it forms :

The ionic radii of K?, Na?, Al³? and Mg²? are in the order