The species that does not contain peroxide ions is:

(a) PbO₂

(b) H₂O₂

(c) SrO₂

(d) BaO₂

Which of the following on heating produces NO₂?

(1) NaNO₃

(2) AgNO₃

(3) NH₄NO₃

(4) NH₄NO₂

The formation of ${\mathrm{PH}}_4^{+}$ is difficult compared to ${\mathrm{NH}}_4^{+}$ because

1. lone pair of phosphorous is optically inert

2. lone pair of phosphorous resides in almost pure p- orbital

3. lone pair of phosphorous resides at sp³ orbital

4. lone pair of phosphorous resides in almost pure s- orbital

Concentrated nitric acid reacts with iodine to give:

(1) HOI

(2) HI

(3) HIO₃

(4) HIO4

Partial Hydrolysis of one mole of peroxodi-sulphuric acid produces:

(1) two moles of sulphuric acid

(2) two moles of peroxomono-sulphuric acid

(3) one mole of sulphuric acid, one mole of peroxomono-sulphuric acid

(4) one mole of sulphuric acid, one mole of peroxomono-sulphuric acid and one mole of hydrogen peroxide

Which of the following is the correct statement?

(1) F₂ has higher dissociation energy than Cl₂

(2) F has higher electron affinity than Cl

(3) HF is stronger acid than HCl

(4) Boiling point increases down the group in halogens

Incorrectly matched characteristic is:

1. S₈: covalent lattice

2. P₄: tetrahedron

3. S₅^2-: zigzag

4. SiO₂: Covalent lattice

Among the following compounds, which on heating do not produce N₂?

(1) (NH₄)₂Cr₂O₇

(2) NH₄Cl+NaNO₂

(3) NH₄Cl+CaO

(4) Ba(N₃)₂

Which of the following oxyacid contains both P-H and P-P bond simultaneously?

1. H₄P₂O₅

2. H₄P₂O₇

3. H₄P₂O₆

4. None

In which process does the nitrogen undergo oxidation?

(1) N_{2 ^$\to$}2NH₃

(2) N₂O_{4  ^$\to$}2NO₂

(3) NO3^- _$\to$ N₂O₅

(4) NO₂^{-  _$\to$}NO₃^-