Copper II Chl...

Copper II Chloride

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Q. The brown ring for

N O_{2}^{-}

and

N O_{3}^{-}

is due to the formation of complex ion with formula :

${[F e {(H_{2} O)}_{6}]}_{6}^{2 +}$
${[F e (N O) {(C N)}_{5}]}_{5}^{2 -}$
${[F e {(H_{2} O)}_{5} N O]}_{5}^{2 +}$
${[F e {(H_{2} O)}_{5}]}_{5}^{2 +}$

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Q. Dimethylglyoxime in a suitable solvent was refluxed for 10 minutes with pure pieces of nickel sheet, it will result in

red precipitate
blue precipitate
yellow precipitate
no precipitate

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Q. A white powder when strongly heated gives off brown fumes. A solution of this powder gives a yellow precipitate with a solution of

K I

. When a solution of barium chlorine is added to solution of powder, a white precipitate results. This white powder may be:

$B a (N O_{3})_{2}$
$A g N O_{3}$
$K B r or N a B r$
A soluble sulphate

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Q. The reaction of

K_{3} [F e (C N)_{6}]

with freshly prepared

F e S O_{4}

solution produces a dark blue precipitate called Turnbull’s blue. Reaction of

K_{4} [F e (C N)_{6}]

with the

F e S O_{4}

solution in complete absence of air produces a white precipitate

X

, which turns blue in air. Mixing the

F e S O_{4}

solution with

N a N O_{3},

followed by a slow addition of concentrated

H_{2} S O_{4}

through the side of the test tube produces a brown ring.

Among the following, the brown ring is due to the formation of

$[F e (N O)_{2} (S O_{4})_{2}]^{2 -}$
$[F e (N O)_{2} (H_{2} O)_{4}]^{3 +}$
$[F e (N O)_{4} (S O_{4})_{2}]$
$[F e (N O) (H_{2} O)_{5}]^{2 +}$

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Q. State whether the following statements are true or false.

S_{1}

A g I

is less soluble in water than

A g F

due to more polarization of

I^{-}

in comparison to

F^{-}

ion.

S_{2}

: The melting point of

B a C l_{2}

is higher than the melting point of

B e C l_{2}

due to greater ionic nature of

B a C l_{2}

S_{3}

: The order of hydrated radii is :

A l^{3 +} (a q) > M g^{2 +} (a q) > N a^{+} (a q)

F T T
T T F
T F T
T T T

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Q. Dissolution of a solute is an exothermic process, if:

Lattice Energy > Hydration Energy
Hydration Energy > Lattice energy
All of the above
Hydration Energy = Lattice Energy

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Q. The reagent(s) that can selectively precipitate

S^{2 -}

from a mixture of

S^{2 -}

and

S O_{4}^{2 -}

in aqueous solution is/are:

$N a_{2} [F e (C N)_{5} N O]$
$P b (O O C C H_{3})_{2}$
$C u C l_{2}$
$B a C l_{2}$

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Q. Which of the following statement(s) is/are correct with reference to the ferrous and ferric ions ?

$F e^{3 +}$ gives brown colour with potassium ferricyanide
$F e^{2 +}$ gives blue colour with potassium ferricyanide
$F e^{3 +}$ gives red colour with potassium thiocyanate
$F e^{2 +}$ gives brown colour with ammonium thiocyanate

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Q. Dimethylglyoxime in a suitable solvent was refluxed for 10 minutes with pure pieces of nickel sheet, it will result in

red precipitate
blue precipitate
yellow precipitate
no precipitate

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Q. In how many of the following reactions one of the products is obtained as a black precipitate ?
(i)

B i (O H)_{3} ↓ + [S n (O H)_{4}]^{2 -} (a q) ⟶ P r o d u c t s

(ii)

B i^{3 +} (a q) + I^{-} (a q) (n o t i n e x c e s s) ⟶ P r o d u c t s

(iii)

A g^{+} (a q) + H_{2} S (g) H^{+} - - \to P r o d u c t s

(iv)

[B i I_{4}]^{-} (a q) + H_{2} O (l) D i l u t i o n - ---- \to P r o d u c t s

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Q. Name the techniques used to separate a solid from its solution.

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Q. The reagent(s) that can selectively precipitate

S^{2 -}

from a mixture of

S^{2 -}

and

S O_{4}^{2 -}

in aqueous solution is/are:

$C u C l_{2}$
$B a C l_{2}$
$P b (O O C C H_{3})_{2}$
$N a_{2} [F e (C N)_{5} N O]$

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Q. Assertion :Statement-I: Nessler's reagent gives a brown precipitate with

N H_{3}

.
Reason: Statement-II :

N H_{4} O H

gives a brown precipitate with

F e^{3 +}

Read the above assertion and reason and choose the correct option regarding it.

Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.
Statement-I is true, Statement-II is true ; Statement-II is NOT a correct explanation for Statement-I.
Statement-I is true, Statement-II is false.
Statement-I is false, Statement-II is true.

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State True or False.

K I

solution identifies

P b^{2 +}

True
False

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