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Q.

Identify the correct statments

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a

Mass of H–atom is 1.66 × 10–27 kg.

b

Cu dissolves in H2SO4 and liberates H2.

c

H2 is liberated by the action of Al with con.NaOH

d

Hydrogen contains at room temperature 25% para and 75% ortho form

answer is A, C, D.

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Detailed Solution

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Copper does not reacts with dilute sulphuric acid, liberating hydrogen because copper is lower in the electromotive series than hydrogen.

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