1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following two molecular species are Diamagnetic in nature?

$$[\mathrm{A}]=\mathrm{O}_2^{-} \quad[\mathrm{B}] .=\mathrm{N}_2^{+} \quad[\mathrm{C}]=\mathrm{C}_2 \quad[\mathrm{D}]=\mathrm{O}_2{ }^{2-}$$

A
A & B
B
B & C
C
C & D
D
D & A
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Choose the incorrect statement from the following:

A. Isoelectronic molecules/ions have the same bond order.

B. Dipole moment of $$\mathrm{NH}_3$$ is greater than that of $$\mathrm{NF}_3$$.

C. The Carbon in Methyl Carbocation is $$\mathrm{sp}^3$$ hybridised.

D. The stability of an ionic compound is measured in terms of its lattice enthalpy and not simply based on attaining Octet configuration.

A
C
B
A
C
D
D
B
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

On the basis of VSEPR theory, match the molecules listed in Column I with their shapes given in Column II.

No. Column I No. Column II
A $$\mathrm{ClF_3}$$ P Sea saw
B $$\mathrm{BrF_5}$$ Q Pentagonal bipyramidal
C $$\mathrm{SF_4}$$ R Square pyramidal
D $$\mathrm{IF_7}$$ S T-shaped

A
$$ \mathrm{A}=\mathrm{R} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{S} \quad \mathrm{D}=\mathrm{Q} $$
B
$$ \mathrm{A}=\mathrm{R} \quad \mathrm{B}=\mathrm{S} \quad \mathrm{C}=\mathrm{P} \quad \mathrm{D}=\mathrm{Q} $$
C
$$ \mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{R} \quad \mathrm{C}=\mathrm{P} \quad \mathrm{D}=\mathrm{Q} $$
D
$$ \mathrm{A}=\mathrm{Q} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{S} \quad \mathrm{D}=\mathrm{R} $$
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Identify the pair of molecules, both of which have positive values of Dipole moment.

A
$$\mathrm{NF}_3$$ & $$\mathrm{CHCl}_3$$
B
$$\mathrm{BF}_3$$ & $$\mathrm{CHCl}_3$$
C
$$\mathrm{NF}_3$$ & $$\mathrm{CCl}_4$$
D
$$\mathrm{BF}_3$$ & $$\mathrm{CCl}_4$$
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