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1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
The first electron gain enthalpy of oxygen is $-141 \mathrm{~kJ} \mathrm{~mol}^{-1}$, its second electron gain enthalpy is :
A
A positive value
B
Less negative value than the first
C
Maximum negative value than the first
D
Same value as that of the first
2
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
3
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
$$\mathrm{N}>\mathrm{S}>\mathrm{P}$$
4
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
$$ \mathrm{B}<\mathrm{C}<\mathrm{N}<\mathrm{O} \text { [Increasing First Ionisation Enthalpy] } $$
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