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Standard XII

Chemistry

Entropy

Cu 2+ and Ag...

Question

${C u}^{2 +} a n d {A g}^{+}$ are both present in the same solution. To percipitate one of the ions and leave the other in solution, add :

H_{2} S (a q)

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H C l (a q)

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{H N O}_{3} (a q)

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{N H}_{4} {N O}_{3} (a q)

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Solution

The correct option is B $H C l (a q)$
Silver ions react with dil $H C l$ to form a white precipitate of $A g C l$ .
Copper(II) ions do not form such precipitate
$A g N O_{3} + H C l \to A g C l + H N O_{3}$

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Similar questions

C u^{2 +}

and

A g^{+}

are both present in the same solution. To precipitate one of the ions and leave the other in solution, add :

Q. Both metals

M g

and

F e

can reduce copper from a solution having

{C u}^{2 +}

ion, according to equilibria.

M g (s) + {C u}^{2 +} (a q) ⇌ {M g}^{2 +} (a q) + C u (s); K_{1} = 6 \times 10^{90}

F e (s) + {C u}^{2 +} (a q) ⇌ {F e}^{2 +} (a q) + C u (s); K_{1} = 3 \times 10^{26}

Which metal will remove cupric ion from the solution to a greater extent?

Q. The molality (m) of each ion

(N H_{4}^{+}

and

C l^{-})

, respectively, present in the aqueous solution of

2 M N H_{4} C l

assuming

100 %

dissociation according to given reaction is,

N H_{4} C l (a q) \to N H_{4}^{+} (a q) + C l^{-} (a q)

Given that density of solution

= 3.107

g/ml.

Q. To increase significantly the concentration of free

Z n^{2 +}

ion in a solution of the complex ion

{[Z n {(N H_{3})}_{4}]}^{2 +}

, add some ________ to the solution.

{Z n^{2 +}}_{(a q)} + 4 N H_{3} ⇌ {[Z n {(N H_{3})}_{4}]}^{2 +}_{(a q)}

Q. A test for the complete removal of

C u^{2 +}

ions from a solution of

C u^{2 +} (a q .)

is to add

N H_{3} (a q .)

. A blue colour signifies the formation of complex

[C u (N H_{3})_{4}]^{2 +}

that has

K_{f} = 1.1 \times 10^{13}

and thus confirms the presence of

C u^{2 +}

in the solution. 250 mL of 0.1 M

C u S O_{4} (a q .)

is electrolyzed by passing a current of 3.5 ampere for 1350 seconds. Then, sufficient quantity of

N H_{3} (a q .)

is added to the electrolyzed solution maintaining

[N H_{3}] = 0.1 M

. If

[C u (N H_{3})_{4}]^{2 +}

is detectable upto its concentration as low as

1 \times 10^{- 5}

. Pick the correct statement(s):

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Cu2+andAg+ are both present in the same solution. To percipitate one of the ions and leave the other in solution, add :

The correct option is B HCl(aq)Silver ions react with dil HCl to form a white precipitate of AgCl.Copper(II) ions do not form such precipitateAgNO3+HCl→AgCl+HNO3

${C u}^{2 +} a n d {A g}^{+}$ are both present in the same solution. To percipitate one of the ions and leave the other in solution, add :

The correct option is B $H C l (a q)$
Silver ions react with dil $H C l$ to form a white precipitate of $A g C l$ .
Copper(II) ions do not form such precipitate
$A g N O_{3} + H C l \to A g C l + H N O_{3}$