NO₂ is the anhydride of

1. HNO₃

2. HNO₂

3. HNO₃ + HNO₂

4. None of the above

Which is not hydrolysed with water?

1. ${\mathrm{PCl}}_3$

2. ${\mathrm{NF}}_3$

3. ${\mathrm{NCl}}_3$

4. ${\mathrm{BCl}}_3$

When ${\mathrm{PCl}}_3$ is hydrolysed then oxyacid of phosphorous is obtained. The basicity of oxyacid is

Which set of oxide of nitrogen is paramagnetic in nature?

1. NO, ${\mathrm{N}}_2\mathrm{O}$

2. ${\mathrm{NO}}_2$, NO, ${\mathrm{N}}_2\mathrm{O}$

3. NO, ${\mathrm{NO}}_2$

4. ${\mathrm{NO}}_2$, ${\mathrm{N}}_2\mathrm{O}$

Correct order of boiling point of group 16 hydrides is

1. H₂O < H₂S < H₂Se < H₂Te

2. H₂Te < H₂Se < H₂S < H₂O

3. H₂S < H₂Se < H₂Te < H₂O

4. H₂O < H₂Te < H₂Se < H₂S

S – S bond is present in

1. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$

2. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$

3. ${\mathrm{H}}_2{\mathrm{SO}}_5$

4. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_6$

Which is incorrectly given according to the order indicated?

The correct order of acidic strength of oxyacids of phosphorous is

Which is mismatched with respect to the shapes of the compounds given?

On addition of conc. H₂SO₄ to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes come out. This is because

1. H₂SO₄ reduces HI to I₂

2. HI is of violet colour

3. HI gets oxidised to I₂

4. HI changes to HIO₃