Which of the following statement(s) are wrong ?

Chemistry Structure of Atom General Single Correct MCQ

Published on: August 11, 2026

Photons having energy 400 kJ will break 4 mole bonds of a molecule A 2 where A–A bond dissociation energy is 100kJ/mol.

Two bulbs are emitting light having wavelength 2000Å & 3000Å respectively. If the bulbs A & B are 40 watt and 30 watt respectively then the ratio of no. of photons emitted by A & B per day is 1 : 2.

When an electron make transition from lower to higher orbit, photon is emitted.

None of the above

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The correct answer is:

CHECK THE SOLUTION.

(a,b,c) Since the number of photons is not specified (it may or may not be equal to 4 N A ). So, this statement is not always true.

No.of photon emitted per day × Energy of one photon = Energy emitted per day.

For bulb A, × × 1.6 × 10 –19 = 40 × 24 × 3600.

For bulb B, × × 1.6 × 10 –19 = 30 × 24 × 3600.

∴ : = 8 : 9.

When an electron make transition from lower to higher orbit, a photon is absorbed.

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