Stoichiometry
Which of the following is an exothermic reaction?

None of these
Conversion of graphite to diamond
Decomposition of water
Dehydrogenation of ethane to ethylene

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Stoichiometry
An ideal gas can be liquified, because

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

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

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