Copper II Sulphate

Q. When $CuS{O}_4$ is treated with excess KCN solution, what compound(s) is/are formed?

1. $K\left[Cu\right(CN{)}_2]$
2. $K_3\left[Cu\right(CN{)}_4]$
3. $K_2\left[Cu\right(CN{)}_4]$
4. $N\equiv C-C\equiv N$

Q. Upon treatment with ammoniacal $H_{2}S$, the metal ion that precipitates as a sulfide is

1. $Fe\left(III\right)$
2. $Al\left(III\right)$
3. $Zn\left(II\right)$
4. $Mg\left(II\right)$

Q. $CuS{O}_4$ decolourises on addition of KCN, the product is

1. $C{u}^{2+}$ gets reduced to form $\left[Cu\right(CN{)}_4{]}^{3-}$
2. $Cu(CN{)}_2$
3. $\left[Cu\right(CN{)}_4{]}^{2-}$
4. $CuCN$

Q.

Give a chemical test to distinguish between the following pair of compounds

Ferrous sulphate and ferric sulphate solution using sodium hydroxide solution

Q. $100\text{mL}$ each of two sols of $AgI$, one obtained by adding $AgN{O}_3$ to slight excess of $KI$ and another obtained by adding $KI$ to a slight excess of $AgN{O}_3$, are mixed together. Then

1. A true solution will be obtained
2. The two sols will stabilize each other
3. The sol particles will acquire more electric charge
4. The sols will coagulate each other mutually

Q. Hydrogen sulphide gas turns lead acetate paper black.

1. True
2. False

Q.

Which of the following experiments will generate a white precipitate in the test tube?

1. 

2. 

3. 

4. 

Q. When disodium hydrogenphosphate solution is added to a solution containing $M{g}^{2+}$ ions, the colour of the precipitate formed is:

1. Black
2. White
3. Red
4. Yellow

Q. Which of the following statements is wrong about $CuS{O}_4$?

1. It gives $CuO$ on strong heating in the presensce of air
2. Its tartarate complex reacts with $NaOH$ and glucose which on heating gives $C{u}_{2}O$
3. It reacts with $KI$ to give $I_2$
4. It reacts with $KCl$ to give $C{l}_2$

Q. The types of bonds present in $CuS{O}_4.5H_{2}O$ are only

1. Electrovalent and covalent
2. Electrovalent and coordinate covalent
3. Electrovalent, covalent, and coordinate covalent
4. Covalent and coordinate covalent

Q. On adding excess of ammonium hydroxide to a copper sulphate solution:

1. A deep blue solution is obtained
2. No change is observed
3. Blue precipitate of copper hydroxide is obtained
4. Black precipitate of copper oxide is obtained

Q. Why blue colour of copper sulphate solution in water changes to yellow when treated with concentrated hydrochloric acid?

Q. $2CuS{O}_4+K_4\left[Fe\right(CN{)}_6]⟶A+2K_{2}S{O}_4.A$ is

1. None of the above
2. $C{u}_2\left[Fe\right(CN{)}_6]$
3. $Cu\left[Fe\right(CN)z-6]$
4. $C{u}_2\left[Fe\right(CN{)}_4]$

Q. The reagent commonly used to determine hardness of water titrimetrically is:

1. Oxalic acid
2. Disodium salt of EDTA
3. Sodium carbonate
4. Sodium citrate

Q. The types of bonds present in $CuS{O}_4.5H_{2}O$ are only

1. Electrovalent and covalent
2. Electrovalent and coordinate covalent
3. Covalent and coordinate covalent
4. Electrovalent, covalent, and coordinate covalent

Q. If true enter 1, else enter 0.
All the $Al-Cl$ bonds in ${Al}_2{Cl}_6$ are equivalent.

Q. $Pb(CN{)}_2$ $+\text{excess}KCN$ $\to \text{product}$

1. $\left[Pb\right(CN{)}_6{]}^{2-}$
2. $\left[Pb\right(CN{)}_4{]}^{2-}$
3. No reaction takes place
4. $Pb$

Q.

1. True
2. False

Q. $CuS{O}_4$ decolorizes on addition of $KCN$, the product is :

1. $CuCN$
2. $\left[Cu\right(CN{)}_4{]}^{2-}$
3. $Cu(CN{)}_2$
4. $C{u}^{2+}$ get reduced to form $\left[Cu\right(CN{)}_4{]}^{2-}$

Q. No. of double bond present in the Lewis structure of $P{F}_6^{-}$ is :

Q. $K_4\left[Fe\right(CN{)}_6]$ can be used to detect:

1. $F{e}^{2+},F{e}^{3+}$
2. $F{e}^{3+},Z{n}^{2+},C{u}^{2+}$
3. $F{e}^{2+},F{e}^{3+},Z{n}^{2+},C{u}^{2+}$
4. All of the above
   

Q.

1. True
2. False

Q. Correct code for the following thermal composition reaction(s) evolving gas having equal number $\sigma$ and $\pi$ bonds is:
(i) $BeC{O}_3\stackrel{\Delta }{\to }$

1. all of these
2. i, ii, iii
3. i, iii, iv
4. i, ii

Q. Match the statement in Column I with statements in Column II

Q. The chocolate coloured precipitate is_________.

1. $F{e}_2\left[Fe\right(CN{)}_6]$
2. $HgS{O}_4$
3. $C{u}_2\left[Fe\right(CN{)}_6]$
4. $\left[Fe\right(H_{2}O{)}_5\left(NO\right)]S{O}_4$

Q.

Copper sulphate solution reacts with KCN to give :

1. $Cu(CN{)}_2$
2. $CuCN$
3. $K_3\left[Cu\right(CN{)}_4]$
4. $K_4\left[Cu\right(CN{)}_4]$

Q. The colour of light absorbed by an aqueous solution of $CuS{O}_4$ is

1. Orange red
2. Blue green
3. Yellow
4. Violet

Q. Which of the following statements is wrong about $CuS{O}_4$?

1. It reacts with $KI$ to give $I_2$
2. It reacts with $KCl$ to give $C{l}_2$
3. Its tartarate complex reacts with $NaOH$ and glucose which on heating gives $C{u}_{2}O$
4. It gives $CuO$ on strong heating in the presensce of air

Q. If true enter 1, else enter 0.
Blue coloured precipitate of Prussian blue has total of iron atoms(s) 4.

Q. When $CuS{O}_4$ is treated with excess KCN solution, what compound(s) is/are formed?

1. $K\left[Cu\right(CN{)}_2]$
2. $K_3\left[Cu\right(CN{)}_4]$
3. $K_2\left[Cu\right(CN{)}_4]$
4. $N\equiv C-C\equiv N$