IIT-JEE 2007 Paper 2 Offline

MCQ (Single Correct Answer)

-1

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 metal ion treatment with a solution of cobalt (II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is:

Pb$$^{2+}$$

Hg$$^{2+}$$

Cu$$^{2+}$$

Co$$^{2+}$$

IIT-JEE 2006

MCQ (Single Correct Answer)

-1

A solution when diluted with $\mathrm{H}_2 \mathrm{O}$ and boiled, it gives a white precipitate. On addition of excess $\mathrm{NH}_4 \mathrm{Cl} / \mathrm{NH}_4 \mathrm{OH}$, the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in $\mathrm{NH}_4 \mathrm{OH} / \mathrm{NH}_4 \mathrm{Cl}$.

$\mathrm{Zn}(\mathrm{OH})_2$

$\mathrm{Al}(\mathrm{OH})_3$

$\mathrm{Mg}(\mathrm{OH})_2$

$\mathrm{Ca}(\mathrm{OH})_2$

IIT-JEE 2006

MCQ (Single Correct Answer)

-1

$\mathrm{CuSO}_4$ decolourises on addition of KCN , the product is

$\left[\mathrm{Cu}(\mathrm{CN})_4\right]^{2-}$

$\mathrm{Cu}^{2+}$ get reduced to form $\left[\mathrm{Cu}(\mathrm{CN})_4\right]^{3-}$

$\mathrm{Cu}(\mathrm{CN})_2$

CuCN

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