When a lead storage battery is discharged;

• SO₂ is evolved

• lead sulphate is consumed

• lead is formed

• sulphuric acid is consumed

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

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

For the cell reaction,

Pb + Sn²⁺ $\to$  Pb²⁺ + Sn

Given that, Pb $\to$ Pb²⁺, E$°$ = 0.13 V

Sn²⁺ +2e^- $\to$ Sn, E^$°$ = -0.14 V

What would be the ratio of cation concentration for which E = 0 ?

• $\frac{1}{4}$

• $\frac{1}{2}$

• $\frac{1}{3}$

• $\frac{1}{1}$

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

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

287.

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

Choose the correct statement from the following.

• The greater positive value of ${\mathrm{E}}_{\mathrm{OP}}^{°}$ indicates greater reactivity of metal

• F^- is strong oxidant while Cu²⁺ is weak reductant

• The metals placed above Mg in the electrochemical series do not decompose water at ordinary temperature

• Oxides of Hg do not decompose on heating

The effective neutron capture radius of a nucleus having a cross- section of 1.0 barr is [ Given, 1 barr = 1.0 x 10^-24 cm²]

• 5.6 x 10^-13cm

• 4.3 x 10^-13cm

• 2.3 x 10^-11 cm

• 5.6 x 10^-24cm

C₆H₅ - NHOH + C₆H₅ - NO $\stackrel{\mathrm{NaOH}}{\to }$(X), (X) formed in the above reaction is

• 

• (C₆H₅)₂NOH

• 

•