A covalent hydride which does not exist as a gas at room temperature is

In the electrolysis of dilute hydrochloric acid at the anode

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.