NEET

Which one is not called a anode reaction from the following

Cl^- ⟶ \(\frac{1}{2}\)Cl₂ + e^-
Cu ⟶ Cu⁺⁺ + 2e^-
Hg⁺ ⟶ Hg⁺⁺ + e^-
Zn²⁺ + 2e^- ⟶ Zn

Solution

The element that is easiest to be reduced:

Solution

Ag is easiest to be reduced among the given choices because its reduction potential is highest among the given choices.

The standard hydrogen electrode potential is zero, because

hydrogen oxidized easily
electrode potential is considered as zero
hydrogen atom has only one electron
hydrogen is a very light element

Solution

Electrode potential is considered as zero.

The reference electrode is made by using

ZnCl₂
CuSO₄
HgCl₂
Hg₂Cl₂

Solution

Calomel electrode is used as reference electrode.

In electrolysis of dilute H₂SO₄, what is liberated at anode?

H₂
\(SO_{4}^{2-}\)
SO₂
O₂

Solution

Solution

2Cr³⁺ + 7H₂O ⟶ \(Cr_{2}O_{7}^{-2}\)
O.S. of Cr changes from +3 to +6 by loss of electrons.At anode oxidation takes place.

0.5328 V
0.3552 V
0.1773 V
0.7104 V

Solution

The number of electrons passing per second through a cross-section of copper wire carrying 10–6 amperes of current per second is found to be

1.6 × 10^–19
6× 10^–35
6× 10^–16
6 × 10¹²

Solution

What is the time (in sec) required for depositing all the silver present in 125 mL of 1 M AgNO₃ solution bypassing a current of 241.25 A?(1 F = 96500 C)

10
50
1000
100

Solution

On passing C ampere of electricity through a electrolyte solution for t second. m gram metal deposits on cathode.The equivalent weight E of the metal is

E = \(\frac{c \times t}{m \times 96500}\)
E = \(\frac{c \times m}{t \times 96500}\)
E =\(\frac{m \times 96500}{c \times t}\)
E = \(\frac{c \times t \times 96500}{m}\)

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