Which of the following compounds is not an acidic salt?

1. NaH₂PO₂

2. NaH₂PO₃

3. Na₂H₂S₂O₇

4. NaH₂PO₄

Hydrogen peroxide can be generated by the hydrolysis of

1. ${\mathrm{HNO}}_3$

2. ${\mathrm{H}}_2{\mathrm{P}}_2\mathrm{O}$

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

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

Which of the following gases is the easiest to liquefy?

A solid (A) reacts with strong aqueous NaOH, liberating a foul smelling gas (B), which spontaneously burns in the air, giving smoky rings. A and B are, respectively:

1. P₄ (red) and PH₃ 

2. P₄ (white) and PH₃

3. S₈ and H₂S

4. P₄ (white) and H₂S

An element belongs to group 15 and 3^rd period of the periodic table. Its electronic configuration would be:
1. \(\mathrm{1 s^2 2 s^2 2 p^4} \)
2. \(\mathrm{1 s^2 2 s^2 2 p^3} \)
3. \(\mathrm{1 s^2 2 s^2 2 p^6 3 s^2 3 p^2} \)
4. \(\mathrm{1 s^2 2 s^2 2 p^6 3 s^2 3 p^3}\)

The word neon signifies:

(1) new

(2) old

(3) strange

(4) none of these

The mineral Clevite on heating gives:

(1) He

(2) Xe

(3) Ar

(4) Ra

Which of the following statements is false? 

What are the products formed in the reaction of xenon hexafluoride with silicon dioxide?

1. ${\mathrm{XeSiO}}_4$ +HF

2. ${\mathrm{XeF}}_2<mspace\; width="1em"></mspace>+{\mathrm{SiF}}_4$

3. ${\mathrm{XeOF}}_4<mspace\; width="1em"></mspace>+{\mathrm{SiF}}_4$

4. ${\mathrm{XeO}}_3<mspace\; width="1em"></mspace>+{\mathrm{SiF}}_2$

Compound of sulphur that has $-\mathrm{O}-\mathrm{O}-\hspace{0.17em}$linkage among the following is:

1. ${\mathrm{H}}_2{\mathrm{SO}}_4,$ $\mathrm{sulphuric}$ $\mathrm{acid}$

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

3. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7,$ $\mathrm{pyrosulphuric}$ $\mathrm{acid}$

4. ${\mathrm{H}}_2{\mathrm{SO}}_3,$ $\mathrm{sulphurous}$ $\mathrm{acid}$