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CBSE

Subject

Chemistry

NEET Chemistry : Electrochemistry

Multiple Choice Questions

81.

Assertion : Al becomes passive in conc. HNO_3.

Reason: Conc. HNO₄, has no action on aluminium metal.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

82.

The hydrogen electrode is dipped in a solution of pH = 3 at 25°C .The potential of the cell would be ,

(the value of 2.303 RT/F is 0.059 V)

0.177 V
0.087 V
-0.177 V
0.059 V

83.

Assertion : In electrolysis, the quantity of electricity needed for depositing 1 mole of silver is different from that required for 1 mole of copper.

Reason : The molecular weights of silver and copper are different.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both assertion and reason are false

84.

Salt bridge contains :

calomel
corrosive sublimate
agar-agar paste
H₂O

85.

In the refining ofsilver by electrolytic method, what will be the weight of 100 g Ag anode if 5A current is passed for hours ? The purity of silver anode is 95% by weight.

42.91 g
57.59 g
13.16 g
36.38 g

86.

Which of the following electrolytic solutions has the least specific conductance ?

0.02 N
0.2 N
2 N
0.002 N

87.

Assertion : Pure iron when heated in dry air is covered with a layer of rust.

Reason : Rust has the composition Fe₃O₂.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false

88.

Assertion : Zinc displaces copper from copper sulphate solution.

Reason : The E $_{298 K}^{°}$ of Zn is -0.76 V and that of Cu is +0.34 V.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

89.

What is the amount of chlorine liberated when 2A of current is passed for 60 minutes in an aqueous solution of NaCl?

2.507 g
1.364 g
2.648 g
3.469 g

90.

Which cell will measure standard electrode potential of copper electrode?

${Pt}_{(s)} | H_{2 (g, 0.1 b a r)} | H_{(a . q ., 1 M)}^{+} | | C u_{(a . q ., 1 M)}^{2 +} | C u_{(s)}$
${Pt}_{(s)} | H_{2 (g, 1 b a r)} | H_{(a . q ., 1 M)}^{+} | | C u_{(a . q ., 1 M)}^{2 +} | C u_{(s)}$
${Pt}_{(s)} | H_{2 (g, 1 b a r)} | H_{(a . q ., 1 M)}^{+} | | C u_{(a . q ., 1 M)}^{2 +} | C u_{(s)}$
${Pt}_{(s)} | H_{2 (g, 1 b a r)} | H_{(a . q ., 0.1 M)}^{+} | | C u_{(a . q ., 1 M)}^{} | C u_{(s)}$

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