Number of compounds from the following with zero dipole moment is ______. $\mathrm{HF}, \mathrm{H}_{2}, \mathrm{H}_{2} \mathrm{~S}, \mathrm{CO}_{2}, \mathrm{NH}_{3}, \mathrm{BF}_{3}, \mathrm{CH}_{4}, \mathrm{CHCl}_{3}, \mathrm{SiF}_{4}$, $\mathrm{H}_{2} \mathrm{O}, \mathrm{BeF}_{2}$

JEE Main · 2024 · 05 Apr 2024 · Shift 2 · Chemical Bonding and Molecular Structure

Number of compounds from the following with zero dipole moment is ______.

HF, H_{2}, H_{2} S, CO_{2}, NH_{3}, BF_{3}, CH_{4}, CHCl_{3}, SiF_{4}

H_{2} O, BeF_{2}

Answer: 6

Among

H F, H_{2}, H_{2} S, C O_{2}, N H_{3}, B F_{3}, C H_{4}, C H C l_{3}, S i F_{4}, H_{2} O, B e F_{2}

, the molecules with a symmetric charge distribution (net dipole moment zero) are:

H_{2}

(homonuclear diatomic),

C O_{2}

(linear, symmetric),

B F_{3}

(trigonal planar),

C H_{4}

(tetrahedral),

S i F_{4}

(tetrahedral), and

B e F_{2}

(linear) — six molecules.

H F

H_{2} S

N H_{3}

C H C l_{3}

and

H_{2} O

each have a net dipole from an asymmetric shape or a lone pair.

JEE Main · 2024 · 05 Apr 2024 · Shift 2 · Integer answer