CBSE Class 12 · 2024 · CapacitanceMultiple Choice

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\textit{Case study — dielectrics in capacitors:} A dielectric slab placed in an external field develops opposite bound charges on its faces, setting up an internal field; this raises a capacitor's capacitance and alters its stored energy. Which of the following is a polar molecule?

(A) $O_{2}$
(B) $H_{2}$
(C) $N_{2}$
(D) $HCl$ ✓ Correct

Answer: (D)

Solution

A polar molecule has a permanent dipole moment arising from an asymmetric charge distribution.

O_{2}

H_{2}

and

N_{2}

are symmetric diatomic molecules with zero dipole moment, whereas

HCl

is heteronuclear and permanently polar. Hence (D).

CBSE Class 12 Board · 2024 · Single correct option

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