On adding $KI$ to a solution of copper sulphate,what happens?

Explain the trends in $M^{2+}/M$ standard electrode potentials.

$Cu^{2+}$ salt reacts with potassium iodide to give:

$\underset{\text{coloured}}{P(\text{soln.})}$ $\xrightarrow{\text{Air}} \underset{\text{coloured}}{Q(\text{soln.})}$ $\xrightarrow{KOH} R \downarrow$
$(R = \text{ppt. Insoluble in both excess } NaOH \text{ and excess } NH_3 \text{ solution})$
Then $P$ contains

Among the following,which is the strongest oxidizing agent?

Which one of the following oxides is ionic?