Identify the correct order of solubility of $N{a}_{2}SNa\_2S$, CuS and ZnS in aqueous medium

Potassium chromate solution is added to an aqueous solution of a metal chloride. The precipitate thus obtained are insoluble in acetic acid. These are subjected to flame test, the colour of the flame is

A metal chloride solution on mixing with $K_{2}Cr{O}_{4}K\_2CrO\_4$ solution gives a yellow ppt., insoluble in acetic acid. The metal may be

Lead has been placed in group 1st and 2nd because

Potassium ferrocyanide is used in the detection

Mg is not precipitated in V group because

Manganese achieves its highest oxidation state in its compound

$K_{2}Mn{O}_{4}K\_2MnO\_4$ can be converted into$KMn{O}_{4}KMnO\_4$ using all of the following except

How many moles of iodine are liberated when $11$ mole of $K_{2}C{r}_2{O}_{7}K\_2Cr\_2O\_7$ reacts with potassium iodide?

When $H_2{O}_{2}H\_2O\_2$ is shaken with an acidified solution of $K_{2}C{r}_2{O}_{7}K\_2Cr\_2O\_7$ in presence of ether, the etheral layer turns blue due to the formation of