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1 L of methane weighs 1.2 g and 2 L of a...

1 L of methane weighs 1.2 g and 2 L of an alkyne 'X' weighs 8.09 g under identical conditions of temperature and pressure. Unknown gas 'X' is

A

Diamond is exothermic substance

B

Graphite is endothermic substance

C

Graphite is more stable than diamond

D

Both (1) & (2)

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