Which of the following is not tetrahedral in shape?

$1. {\mathrm{NH}}_4^{+}$
$2. {\mathrm{SiCl}}_4$
$3. {\mathrm{SF}}_4$
$4. {\mathrm{SO}}_4^{2-}$

Which of the following are peroxoacids of sulphur?

$1.{\mathrm{H}}_2{\mathrm{SO}}_{5 } \mathrm{and} {\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$
$2.{\mathrm{H}}_2{\mathrm{SO}}_{5 } \mathrm{and} {\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$
$3.{\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7 \mathrm{and} {\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$
$4.{\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_6 \mathrm{and} {\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$

Hot conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which of the following element is oxidised by conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ into two gaseous products?

1.  Cu

2.  S

3.  C

4.  Zn

A black compound of manganese reacts with a halogen acid to give greenish-yellow gas. When an excess of this gas reacts with ${\mathrm{NH}}_3$ an unstable trihalide is formed. In this process, the oxidation state of nitrogen changes from-

1. -3 to +3

2. -3 to 0

3. -3 to +5

4. 0 to -3

In the preparation of compounds of Xe, Bartlett had taken ${\mathrm{O}}_2^{+}{\mathrm{PtF}}_6^{-}$ as a base compound. This is because-

In solid-state, PCl₅ exists as: 

Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidising power.

$1. {\mathrm{ClO}}_4^{-} > {\mathrm{IO}}_4^{-} > {\mathrm{BrO}}_4^{-}$
$2. {\mathrm{IO}}_4^{-} > {\mathrm{BrO}}_4^{-} > {\mathrm{ClO}}_4^{-}$
$3. {\mathrm{BrO}}_4^{-} > {\mathrm{IO}}_4^{-} > {\mathrm{ClO}}_4^{-}$
$4. {\mathrm{BrO}}_4^{-} > {\mathrm{ClO}}_4^{-} > {\mathrm{IO}}_4^{-}$

Which of the following is isoelectronic pair?

1. ${\mathrm{ICl}}_2$ , ${\mathrm{ClO}}_2$

2. ${\mathrm{BrO}}_2^{-}$ , ${\mathrm{BrF}}_2^{+}$

3. ${\mathrm{ClO}}_2$ , $\mathrm{BrF}$

4. ${\mathrm{CN}}^{-}$ , ${\mathrm{O}}_3$

If chlorine gas is passed through a hot NaOH solution, two changes are observed in the oxidation number of chlorine during the reaction. These are ......... and  .............

a. 0 to +5

b. 0 to +3

c. 0 to -1

d. 0 to +1

Choose the correct option

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)

Which of the following options are not in accordance with the property mentioned against them?

a. F₂ > Cl₂ > Br₂ > I₂                                   Oxidising power

b. MI > MBr > MCI > MF                            lonic character of metal halide

c. F₂ >Cl₂ > Br₂ > I₂                                     Bond dissociation enthalpy

d. HI < HBr < HCl < HF                               Hydrogen-halogen bond strength

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)