5
MCQ (Single Correct Answer)
The exhibition of highest coordination number depends on the availability of vacant orbitals in the central atom. Which of the following elements is not likely to act as central atom in $M \mathrm{~F}_6^{3-}$ ?
A
B
B
Al
C
Ga
D
In
6
MCQ (Single Correct Answer)
Boric acid is an acid because its molecule
A
contains replaceable $\mathrm{H}^{+}$ion
B
gives up a proton
C
accepts $\mathrm{OH}^{-}$from water releasing proton
D
combines with proton from water molecule
7
MCQ (Single Correct Answer)
Catenation i.e., linking of similar atoms depends on size and electronic configuration of atoms. The tendency of catenation in group 14 elements follows the order
A
$\mathrm{C}>\mathrm{Si}>\mathrm{Ge}>\mathrm{Sn}$
B
$\mathrm{C}>>\mathrm{Si}>\mathrm{Ge} \approx \mathrm{Sn}$
C
$\mathrm{Si}>\mathrm{C}>\mathrm{Sn}>\mathrm{Ge}$
D
$\mathrm{Ge}>\mathrm{Sn}>\mathrm{Si}>\mathrm{C}$
8
MCQ (Single Correct Answer)
Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding
A
$\mathrm{MeSiCl}_3$
B
$\mathrm{Me}_2 \mathrm{SiCl}_2$
C
$\mathrm{Me}_3 \mathrm{SiCl}$
D
$\mathrm{Me}_4 \mathrm{Si}$
9
MCQ (Single Correct Answer)
Ionisation enthalpy $\left(\Delta_i \mathrm{H} \mathrm{kJ} \mathrm{mol}^{-1}\right)$ for the elements of group 13 follows the order
A
$\mathrm{B}>\mathrm{Al}>$ Ga $>$ In $>$ TI
B
B $<$ Al $<$ Ga $<$ In $<\mathrm{Tl}$
C
$\mathrm{B}<\mathrm{Al}>\mathrm{Ga}<\mathrm{In}>\mathrm{TI}$
D
$\mathrm{B}>\mathrm{Al}<\mathrm{Ga}>\mathrm{In}<\mathrm{TI}$