Stoichiometry
An ideal gas can be liquified, because

Forces operative between its molecules are negligible
It gets solidified directly without becoming liquid
Its critical temperature is more than 0°C
Its molecular size is very small

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Stoichiometry
A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the

Atomic weight of the metal is 2
Equivalent weight of the metal is 8
Atomic weight of the metal is 4
Equivalent weight of the metal is 4

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