Question

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Answer 1

$\huge{\mathcal{Bonjour !!}}$

$no. \: of \: atoms \: in \: 1 \: mol \: of \: diatomic \: gas \: \\ \\ = 2 \times N_a \\ \\ no. \: of \: atoms \: in \: 0.2 \: mol \\ \\ = 0.2 \times 2 \times N_a \\ \\ = 0.4 \times 6.022 \times {10}^{23} \\ \\ = 2.4 \times {10}^{23} atoms$

CORRECT OPTION IS 3.