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CBSE

NEET Chemistry : Electrochemistry

Multiple Choice Questions

31.

When an iron object is plated with tin, tin does not act as sacrificial anode in protecting against corrosion, because

tin is more reactive than iron
tin is less reactive than iron
reactivity of tin and iron is same
tin is oxidising agent while iron is not so

32.

The value of reaction quotient [Q], for the following cell

Zn(s)|Zn²⁺ (0.01 M)|| Ag⁺ (1.25 M | Ag (s) is

156
125
1.25 x 10^-2
6.4 x 10^-3

33.

When a lead storage battery is discharged;

SO₂ is evolved
lead sulphate is consumed
lead is formed
sulphuric acid is consumed

34.

Concentration of the Ag+ ions in a saturated solution of Ag₂C₂O₄ is 2.2 ×10^–4 mol L^–1. Solubility product

2.42 × 10^–8
2.66 × 10^–12
4.5 × 10^–11
4.5 × 10^–11

35.

The standard reduction potential for Zn²⁺/Zn, Ni²⁺/Ni and Fe²⁺/Fe are -0.76, -0.23 and -0.44 V, respectively.

The reaction X + Y²⁺ → X²⁺ + Y will be spontaneous when

X = Ni, Y = Fe
X = Ni, Y = Zn
X =Fe, Y = Zn
X = Zn, Y = Ni

36.

The E^$°$ values for Mn and Zn are more negative than expected because

they have either half-filled and fully-filled configurations
they can easily donate electrons
it is quite easy to remove electrons from their orbitals
None of the above

37.

A hypothetical electrochemical cell is shown below
A^- | A⁺ (xM)|| B⁺ (yM)|B⁺

The emf measured is +0.20 V. The cell reaction is:

A⁺ + B → A + B⁺
A⁺ + e^- → A ; B⁺ + e^- → B^-
the cell reaction cannot be predicted
the cell reaction cannot be predicted

38.

In the reaction,

X + I₂ + 2HCl $\to$ SnCl₄ + 2HI

The correct option regarding X is/ are

It is an strong reducing agent
It is an angular molecule
It is used as a reagent in test of Hg²⁺ radical
All of the above

39.

In the electrochemical cell :
Zn|ZnSO₄(0.01M)||CuSO₄(1.0 M)|Cu, the emf of this Daniel cell is E₁. When the concentration of ZnSO₄ is changed to 1.0 M and that of CuSO₄ changed to 0.01 M, the emf changes to E₂. From the following, which one is the relationship between E₁ and E₂?
(Given, RT/F= 0.059)