21
MCQ (Single Correct Answer)
Which of the following are peroxoacids of sulphur?
A
$\mathrm{H}_2 \mathrm{SO}_5$ and $\mathrm{H}_2 \mathrm{S}_2 \mathrm{O}_8$
B
$\mathrm{H}_2 \mathrm{SO}_5$ and $\mathrm{H}_2 \mathrm{S}_2 \mathrm{O}_7$
C
$\mathrm{H}_2 \mathrm{S}_2 \mathrm{O}_7$ and $\mathrm{H}_2 \mathrm{S}_2 \mathrm{O}_8$
D
$\mathrm{H}_2 \mathrm{S}_2 \mathrm{O}_6$ and $\mathrm{H}_2 \mathrm{S}_2 \mathrm{O}_7$
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