If 1.2 g of a metal displaces 1.12 litre of hydrogen at NTP

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Problem

If 1.2 g of a metal displaces 1.12 litre of hydrogen at NTP. Equivalent mass of the metal would be - (1)

1.2 \times 11.2

(2) 12 (3) 24 (4)

1.2 + 11.2