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22
MCQ (Single Correct Answer)

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?

A
Cu
B
S
C
C
D
Zn
23
MCQ (Single Correct Answer)

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

A
$-$3 to +3
B
$-$3 to 0
C
$-$3 to +5
D
0 to $-$3
24
MCQ (Single Correct Answer)

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

A
both $\mathrm{O}_2$ and Xe have same size.
B
both $\mathrm{O}_2$ and Xe have same electron gain enthalpy.
C
both $\mathrm{O}_2$ and Xe have almost same ionisation enthalpy.
D
both Xe and $\mathrm{O}_2$ are gases.
25
MCQ (Single Correct Answer)

In solid state $\mathrm{PCl}_5$ is a ........... .

A
covalent solid
B
octahedral structure
C
ionic solid with $\left[\mathrm{PCl}_6\right]^{+}$octahedral and $\left[\mathrm{PCl}_4\right]^{-}$tetrahedral
D
ionic solid with $\left[\mathrm{PCl}_4\right]^{+}$tetrahedral and $\left[\mathrm{PCl}_6\right]^{-}$octahedral
26
MCQ (Single Correct Answer)

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

Ion $\mathrm{
CIO_4^-}$		 $\mathrm{IO_4^-}$` $\mathrm{BrO_4^-}$
Reduction potential $E^-/\mathrm{V}$ $E^o=1.19\mathrm{~V}$ $E^s=1.65\mathrm{~V}$ $E^s=1.74\mathrm{~V}$

A
$\mathrm{ClO}_4^{-}>\mathrm{IO}_4^{-}>\mathrm{BrO}_4^{-}$
B
$\mathrm{IO}_4^{-}>\mathrm{BrO}_4^{-}>\mathrm{ClO}_4^{-}$
C
$\mathrm{BrO}_4^{-}>\mathrm{IO}_4^{-}>\mathrm{ClO}_4^{-}$
D
$\mathrm{BrO}_4^{-}>\mathrm{ClO}_4^{-}>\mathrm{IO}_4^{-}$
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