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1
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
$$\mathrm{BF}_3$$ & $$\mathrm{CCl}_4$$
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Given below are 4 molecular species/ions. Identify the species/ion which exhibits diamagnetic nature.

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

A
[C]
B
[A]
C
[D]
D
[B]
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which of these represents the correct order of decreasing bond order?

A
$$\mathrm{C}_2^{2-}>\mathrm{O}_2^{2+}>\mathrm{O}_2^{-}>\mathrm{He}_2^{2+}$$
B
$$\mathrm{O}_2^{-}>\mathrm{O}_2^{+}>\mathrm{He}_2^{+}>\mathrm{C}_2^{2-}$$
C
$$\mathrm{He}_2^{+}>\mathrm{O}_2^{-}>\mathrm{C}_2^{2-}>\mathrm{O}_2^{+}$$
D
$$\mathrm{He}_2^{+}>\mathrm{O}_2^{2-}>\mathrm{O}_2^{+}>\mathrm{O}_2^{-}$$
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Pick up the correct statement.

A
Dipole moment of ammonia is due to orbital dipole and resultant diapole in same direction.
B
$$\mathrm{O}_2, \mathrm{H}_2$$ shown bond diapole due to polarisation.
C
Dipole moment is scalar quantity.
D
In $$\mathrm{BF}_3$$ bond dicopoles are zero but dipole moment is higher.
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