The mass of $4.48 \mathrm{dm}^3$ of certain gas is 5.6 g at STP. Assuming ideal behaviour, identify the probable gas from following.

Identify the defect developed when an ion of an ionic compound is missing from its regular site and occupies interstitial position between lattice points.

Identify from following an example of intensive property?

Methyl propanoate on hydrolysis with dil NaOH forms a salt that on further acidification with conc. HCl forms