By heating which of the following, would NO₂ be produced?

1. NaNO₃

2. AgNO₃

3. NH₄NO₃

4. NH₄NO₂

The formation of ${\mathrm{PH}}_4^{+}$ is difficult as 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.

Iodine on reaction with concentrated nitric acid forms:

1. HOI

2. HI

3. HIO₃

4. HIO₄

Among the following reactions,  N₂ is not generated by heating:

1. (NH₄)₂Cr₂O₇

2. NH₄Cl + NaNO₂

3. NH₄Cl + CaO

4. Ba(N₃)₂

 An oxyacid among the following that contains both P-H and P-P bonds simultaneously is:

1. H₄P₂O₅

2. H₄P₂O₇

3. H₄P₂O₆

4. None of the above

Oxidation of nitrogen among the following reactions is indicated by -
1. \(\mathrm{N}_2 \rightarrow 2 \mathrm{NH}_3 \)
2. \(\mathrm{N}_2 \mathrm{O}_4 \rightarrow 2 \mathrm{NO}_2 \)
3. \(\mathrm{NO}_3{ }^{-} \rightarrow \mathrm{N}_2 \mathrm{O}_5 \)
4. \(\mathrm{NO}_2^{-} \rightarrow \mathrm{NO}_3^{-}\)

NO₂ is the anhydride of

1. HNO₃

2. HNO₂

3. HNO₃ + HNO₂

4. None of the above 

\(\mathrm{PCl}_3\) upon hydrolysis gives an oxyacid of phosphorous.
The basicity of that oxyacid is:

Which set of oxide of nitrogen is paramagnetic in nature?

(1) NO, N₂O

(2) NO₂, NO, N₂O

(3) NO,NO₂

(4) N₂O,NO₂

Which is not hydrolysed with water?

(1) PCl₃

(2) NF₃

(3) NCl₃

(4) BCl₃