23
MCQ (Multiple Correct Answer)
Which of the following sets contain only isoelectronic ions?
A
$\mathrm{Zn}^{2+}, \mathrm{Ca}^{2+}, \mathrm{Ga}^{3+}, \mathrm{AB}^{3+}$
B
$\mathrm{K}^{+}, \mathrm{Ca}^{2+}, \mathrm{Sc}^{3+}, \mathrm{Cl}^{-}$
C
$\mathrm{P}^{3-}, \mathrm{S}^{2-}, \mathrm{Cl}^{-}, \mathrm{K}^{+}$
D
$\mathrm{Ti}^{4+}, \mathrm{Ar}^2, \mathrm{Cr}^{3+}, \mathrm{V}^{5+}$
24
MCQ (Multiple Correct Answer)
In which of the following options order of arrangement does not agree with the variation of property indicated against it?
A
$\mathrm{AP}^{3+}<\mathrm{Mg}^{2+}<\mathrm{Na}^{+}<\mathrm{F}^{-}$(Increasing ionic size)
B
$\mathrm{B}<\mathrm{C}<\mathrm{N}<\mathrm{O}$ ( Increasing first ionisation enthalpy)
C
$\mathrm{I}<\mathrm{Br}<\mathrm{Cl}<\mathrm{F}$ ( Increasing electron gain enthalpy)
D
$\mathrm{Li}<\mathrm{Na}<\mathrm{K}<\mathrm{Rb}$ ( Increasing metallic radius)
25
MCQ (Multiple Correct Answer)
Which of the following have no unit?
A
Electronegativity
B
Electron gain enthalpy
C
Ionisation enthalpy
D
Metallic character
26
MCQ (Multiple Correct Answer)
Ionic radii vary in
A
inverse proportion to the effective nuclear charge
B
inverse proportion to the square of effective nuclear charge
C
direct proportion to the screening effect
D
direct proportion to the square of screening effect
27
MCQ (Multiple Correct Answer)
An element belongs to 3rd period and group 13 of the periodic table. Which of the following properties will be shown by the element?
A
Good conductor of electricity
B
Liquid, metallic
C
Solid, metallic
D
Solid, non-metallic