The difference in the oxidation number of the
two types of sulphur atoms in ${\mathrm{Na}}_2{\mathrm{S}}_4{\mathrm{O}}_6$ is :

1. 4

2. 5

3. 6

4. 7

When Cl₂ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from:

1. zero to +1 and zero to -5

2. zero to -1 and zero to +5

3. zero to -1 and zero to +3

4. zero to +1 and zero to -3

Which of the following compound will not give positive chromyl chloride test?

1. ${\mathrm{CuCl}}_2$

2. NaCl

3. ${\mathrm{ZnCl}}_2$

4. ${\mathrm{C}}_6{\mathrm{H}}_5\stackrel{+}{\mathrm{N}}{\mathrm{H}}_3{\mathrm{Cl}}^{-}$

Which of the following hydrogen halides react with AgNO₃ to give a precipitate that dissolves in hyposolution? 

(I) HCl

(II) HF

(III) HI

(IV) HBr

1. (III), (I), (II)

2. (I), (III), (IV)

3. (IV), (II), (I)

4. (II), (IV), (III)

Strong reducing behavior of H₃PO₂ is due to

1. Presence of one-OH group and two P-H bonds

2. High electron gain enthalpy of phosphorus

3. High oxidation state of phosphorus

4. Presence of two -OH groups and one P-H bonds

The variation of the boiling point of the hydrogen halides is in the order HF > HI >HBr>HCl, What explains the higher boiling point of hydrogen fluoride?

1. The electro negativity of flourine is much higherthan for other elements in the group

2. There is strong hydrogen bonding between HF molecules

3. The bond energy of HF molecules is greater than in other hydrogen halides

4. The effect of nuclear shielding is much reducedin flourine which polarizes the HF molecule

In which of the following arrangement, the order is not according to the property indicated against it

Nitrogen is liberated by the thermal decomposition of only

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 the three

Which of the following pair has bleaching property ?

1. ${\mathrm{O}}_3 \mathrm{and} {\mathrm{NO}}_2$

2. ${\mathrm{O}}_3 \mathrm{and} {\mathrm{H}}_2\mathrm{S}$

3. ${\mathrm{SO}}_2 \mathrm{and} {\mathrm{Cl}}_2$

4. ${\mathrm{Cl}}_2 \mathrm{and} {\mathrm{NO}}_2$