Dry `O_(2)` is heavier than moist `O_(2)`.

Why dry air is heavier than moist air?

Assertion : Bond length of O_(2) is more than that of O_(2)^(+) . Reason : Bond order of O_(2)^(+) is more than that of O_(2).

In the preparation of P_(4)O_(6) , a mixture of N_(2) and O_(2) is used rather than pure O_(2) , why ?

Assertion (A) The O-O bond length in H_(2)O_(2) is shorter than that in O_(2) . Reason (R ) H_(2)O_(2) is ionic compound.

Assertion :H_(0)O_(2) is non - ionic compound. Reason : The O-O bond length in H_(2)O_(2) is shorter than that of O_(2)F_(2) .

Which of the following statements are correct regarding D_(2)O and H_(2)O ? I. D_(2)O reacts with Al_(4)C_(3) at a faster rate than does H_(2)O . II. The freezing point of D_(2)O is higher than that of H_(2)O . III. NaCl is more solution in D_(2)O than in H_(2)O . IV. lonic product of D_(2)O is smaller than that if H_(2)O . Select the correct answer using the codes givem below.

A : N_(2) is more stable than O_(2) . R : Bond order of N_(2) is more than that of O_(2) .