In which of the following arrangements are the ions arranged in decreasing order of ionic size?

The filter in a cigarette reduces the amount of nicotine inhaled by 

If 25cm\(^3\) of a saturated solution contains 0.02 moles of the solute, determine the solubility of the solute.

Biotechnology is applied in the following processes except

The percentage by mass of water in Na\(_2\)CO\(_3\).10H\(_2\)O is  [ Na\(_2\)CO\(_3\).10H\(_2\)O = 286, H\(_2\)O = 18 ]