It is because inability of ns² electrons of the valence shell to participate in bonding that

(a) Sn²⁺ is reducing while Pb⁴⁺ is oxidising agent

(b) Sn²⁺ is oxidising while Pb⁴⁺ is reducing agent

(c) Sn²⁺ and Pb²⁺ are both oxidising and reducing agent

(d) Sn⁴⁺ is reducing while Pb⁴⁺ is oxidising agent

Which of the following on heating produces NO₂?

(1) NaNO₃

(2) AgNO₃

(3) NH₄NO₃

(4) NH₄NO₂

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^-

Which of the following has been arranged in order of decreasing bond dissociation energy:

(1) P-O>Cl-O>S-O

(2) P-O>S-O>Cl-O

(3) S-O>Cl-O>P-O

(4) Cl-O>S-O>P-O

Which set of oxide of nitrogen is paramagnetic in nature?

(1) NO, N₂O

(2) NO₂, NO, N₂O

(3) NO,NO₂

(4) N₂O,NO₂

S-S bond is present in

(1) H₂S₂O₇

(2) H₂SO₅

(3) H₂S₂O₈

(4) H₂S₂O₆

Bleaching action of SO₂ is due to its

(1) acidic property

(2) basic property

(3) reducing property

(4) oxidising property

Which is not hydrolysed with water?

(1) PCl₃

(2) NF₃

(3) NCl₃

(4) BCl₃

Ammonia on reaction with excess of chlorine gives

(1) NCl₃ and HCl

(2) N₂ and NH₄Cl

(3) NCl₃ and NH₄Cl

(4) N₂ and HCl

Nitrogen gas is liberated by the thermal decomposition of:

1. ${\mathrm{NH}}_4{\mathrm{NO}}_2$                                 

2. ${\mathrm{NaN}}_3$

3. ${\left({\mathrm{NH}}_4\right)}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$                           

4. All of the above.