The paramagnetic oxides of nitrogen are:

1. NO, N₂O

2. NO₂, NO, N₂O

3. NO, NO₂

4. NO₂, N₂O

The correct order of boiling points for group 16 hydrides is:

1. H₂O < H₂S < H₂Se < H₂Te

2. H₂Te < H₂Se < H₂S < H₂O

3. H₂S < H₂Se < H₂Te < H₂O

4. H₂O < H₂Te < H₂Se < H₂S

Copper on heating with concentrated HNO₃ produces:

1. Cu(NO₃)₂ and NO       

2. Cu(NO₃)₂, NO and NO₂

3. Cu(NO₃)₂ and N₂O       

4. Cu(NO₃)₂ and NO₂

The correct statement about given acids is:

How can one obtain sulphur trioxide?

1. CaSO₄ + C$\stackrel{∆}{\to }$                         

2. Fe₂(SO₄)₃$\stackrel{∆}{\to }$

3. S + H₂SO₄$\stackrel{∆}{\to }$                         

4. H₂SO₄ + PCl₅ $\stackrel{∆}{\to }$

What is the correct order of oxyacids of phosphorous in terms of their acidic strength?

1. H₃PO₂ > H₃PO₃ > H₃PO₄

2. H₃PO₄ > H₃PO₃ > H₃PO₂

3. H₃PO₃ > H₃PO₂ > H₃PO₄

4. H₃PO₂ > H₃PO₄ > H₃PO₃

The bleaching action of SO₂ is due to its

1. Acidic property

2. Basic property

3. Reducing property

4. Oxidising property

Compound among the following with an S-S bond is :

1. H₂S₂O₇

2. H₂SO₅

3. H₂S₂O₈

4. H₂S₂O₆

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

NO₂ is the anhydride of

1. HNO₃

2. HNO₂

3. HNO₃ + HNO₂

4. None of the above