Which is true about an electron?

Chemistry Structure of Atom General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

Rest mass of electron is 9.1 × 10 –28 g

Mass of electron increases with the increase in velocity

Molar mass of electron is 5.48 × 10 –4 g/mole

e/m of electron is 1.7 × 10 8 coulomb/g

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

(a,b,c,d) m e = 9.1 × 10 –31 kg = 9.1 × 10 –28 g.

m = (m 0 : rest mass ; m : dynamic mass).

As v , ↓ ∴ m

Molar mass of e = 9.1 × 10 –28 × 6.023 × 10 23 = 5.48 × 10 –4 g/mole.

For electron, = = 1.7 × 10 8 c/g.

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