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
$\mathrm{BrO}_4^{-}>\mathrm{ClO}_4^{-}>\mathrm{IO}_4^{-}$
27
MCQ (Single Correct Answer)
Which of the following is isoelectronic pair?
A
$\mathrm{ICl}_2, \mathrm{ClO}_2$
B
$\mathrm{BrO}_2^{-}, \mathrm{BrF}_2^{+}$
C
$\mathrm{ClO}_2, \mathrm{BrF}$
D
$\mathrm{CN}^{-}, \mathrm{O}_3$
28
MCQ (Multiple Correct Answer)
If chlorine gas is passed through 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
29
MCQ (Multiple Correct Answer)
Which of the following options are not in accordance with the property mentioned against them?
A
$\mathrm{F}_2>\mathrm{Cl}_2>\mathrm{Br}_2>\mathrm{I}_2$ Oxidising power
B
$\mathrm{MI}>\mathrm{MBr}>\mathrm{MCl}>\mathrm{MF}$ Ionic character of metal halide
C
$\mathrm{F}_2>\mathrm{Cl}_2>\mathrm{Br}_2>\mathrm{I}_2$ Bond dissociation enthalpy
D
$\mathrm{HI}<\mathrm{HBr}<\mathrm{HCl}<\mathrm{HF}$ Hydrogen-halogen bond strength