Compound $A$ on borax bead test in reducing flame gives green colour bead. Compound $A$ on treatment with $H_2O_2$ followed by treatment with $Pb(OAc)_2$ gives yellow ppt. The metal ion in the compound $A$ is :

Which of these reactions is correct?

Which reagent is used in the qualitative analysis of Group $IV$ cations?

$A$ solution of a metal ion,when treated with $KI$,gives a red precipitate which dissolves in excess $KI$ to give a colourless solution. Moreover,the solution of the metal ion,on treatment with a solution of cobalt$(II)$ thiocyanate,gives rise to a deep blue crystalline precipitate. The metal ion is:

Which of the following ions forms a white precipitate upon the addition of $HCl$ to its aqueous solution?

Choose an incorrect match of the colour of compounds.