Stoichiometry
Refluxing of part of the distillate in a fractionating column is a 'recycling operation', aimed primarily at

None of these
Product enrichment
Yield enhancement
Heat conservation

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP