Stoichiometry
In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is

Independent of the temperature
Unchanged by the pressure change
Decreased with the increase in pressure
Increased with the increase in pressure

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

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