1
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
The first ionisation enthalpy of Al in $\mathrm{kJ} \mathrm{mol}^{-1}$ is: [Given the first ionisation enthalpy of $\mathrm{Na}, \mathrm{Mg}$ and Si in $\mathrm{kJ} \mathrm{mol}^{-1}$ are 497,738 and 787 respectively]
A
769
B
578
C
488
D
857
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

With reference to Pauling's Electronegativity scale, which one of the following options shows the correct order of electronegativity values of elements?

A
$$\mathrm{Na}>\mathrm{Cs}>\mathrm{K}$$
B
$$\mathrm{Mg}>\mathrm{Al}>\mathrm{Si}$$
C
$$\mathrm{B}>\mathrm{C}>\mathrm{Al}$$
D
$$\mathrm{N}>\mathrm{S}>\mathrm{P}$$
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Among the following, which is not according to the property indicated against it?

A
$$ \mathrm{Mg}^{2+}<\mathrm{Na}^{+}<\mathrm{F}^{-}<\mathrm{O}^{2-} \text { [Increasing Ionic Size] } $$
B
$$ \mathrm{I}<\mathrm{Br}<\mathrm{F}<\mathrm{Cl} \text { [Increasing Elecrtron Gain Enthalpy with negative sign] } $$
C
$$ \mathrm{Na}<\mathrm{K}<\mathrm{Rb}<\mathrm{Cs} \text { [Increasing Metallic Radii] } $$
D
$$ \mathrm{B}<\mathrm{C}<\mathrm{N}<\mathrm{O} \text { [Increasing First Ionisation Enthalpy] } $$
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The correct decreasing order of negative electron gain enthalpy for $$\mathrm{C}, \mathrm{Ca}, \mathrm{Al}, \mathrm{F}$$ and $$\mathrm{O}$$ is

A
$$\mathrm{F}>\mathrm{O}>\mathrm{C}>\mathrm{Al}>\mathrm{Ca}$$
B
$$\mathrm{Ca}>\mathrm{Al}>\mathrm{O}>\mathrm{F}>\mathrm{C}$$
C
$$\mathrm{Al}>\mathrm{F}>\mathrm{Ca}>\mathrm{C}>\mathrm{O}$$
D
$$\mathrm{F}>\mathrm{C}>\mathrm{O}>\mathrm{Ca}>\mathrm{Al}$$
COMEDK Subjects
EXAM MAP