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Primary Cells

Consider the ...

Question

Consider the cell reaction:
Cd(s) | Cd²⁺ (1.0 M) || Cu²⁺ (1.0 m) | Cu (s)
If we wish to make a cell with more positive voltage using the same substances, we should:

A

Increase [Cd²⁺] as well as [Cu²⁺] to 2.0 M

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B

Reduce only [Cd²⁺] to 0.1 M

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C

Decrease [Cd²⁺] as well as [Cu²⁺] to 0.1 M

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D

Increase only [Cu²⁺] to 2.0 M

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Solution

The correct option is D
Increase only [Cu²⁺] to 2.0 M

Increase only [Cu²⁺] to 2.0 M

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Similar questions

Q. Consider the cell:

C d (s) | C d^{2 +} (1.0 M) | | C u^{2 +} (0.1 M) | C u (s)

If we wish to make a cell with a more positive voltage using the same substance, we should:

C u^{2 +}

C d^{2 +}

both are present, it is difficult to analyse. A scheme to analyse in a mixture is given below.
KCN forms complex with

C u^{2 +}

C d^{2 +}

C u^{2 +} + 2 C N^{-} ⟶ C u (C N)_{2}

C u (C N)_{2} ⟶ 2 C u C N ↓ + (C N)_{2}

C u C N + 3 K C N K_{3} C u (C N)_{4}] s t a b l e C d^{2 +} + K C N ⟶ K_{2} [C d (C N)_{4}] u n s t a b l e

H_{2} S

gas is passed, unstable complex of

C d^{2 +}

gives yellow ppt

[C d (C N)_{4}]^{2 -} ⇌ C d^{2 +} + 4 C N^{-}

C d^{2 +} + S^{2 -} ⟶ C d S y e l l o w ↓

If true enter 1, else enter 0.

State True or False.

C u^{2 +}

C d^{2 +}

ions react with KCN to form complex.

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

can be used to detect some ions out of

{C d}^{2 +}, {C u}^{2 +}, {Z n}^{2 +}, {F e}^{3 +}, {P b}^{2 +}

{B i}^{3 +}

. Excluded ions are :

Q. In the separation of

C u^{2 +}

C d^{2 +}

in 2nd group of qualitative analysis of eations, tetrammine copper(ll) sulphate and tetraammine cadmium(ll) sulphate react with

K C N

to form the corresponding cyanide complexes; which one of the following pairs of the complexes and their relative stabilities enables the separation of

C u^{2 +}

C d^{2 +}

?

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