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

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Stoichiometry
An ideal gas can be liquified, because

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

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