DIRECTIONS : These are Assertion-Reason type questions. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these question from the following four options.

Statement-1 :Galvanised iron does not rust.
Statement-2 :Zinc has a more negative electrode potential than iron

DIRECTIONS : These are Assertion-Reason type questions. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these question from the following four options.

Statement-1 :On increasing dilution, the specific conductance keep on increasing.
Statement-2 :On increasing dilution, degree of ionisation of weak electrolyte increases and molality of ions also increases.

DIRECTIONS : These are Assertion-Reason type questions. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these question from the following four options.

Statement-1 :The resistivity for a substance is its resistance when it is one meter long and its area of cross section is one square meter.
Statement-2 :The SI units of resistivity is ohm metre (m).

DIRECTIONS: Read the passage given below and answer the question that follow :A solution that is relatively resistant to change in pH is called a buffer solution. We can also say that the solution is buffered the simplest way to achieve substantial conc. of both acid and base in the same solution to use a conjugate acid-base pair. The most common form of buffer solution contains a weak acid and its conjugate base or a weak base and its conjugate acid.By using buffer concept. A student prepare 2L buffer solution of 0.330 M NaH₂PO₄ and 0.330 M Na₂HPO₄. The solution is divided in half between the two compartment (each containing 1L buffer)of an electrolytic cell, the electrodes used are Pt. Assume that the only reaction is the electrolysis of water. If electrolysis is carried out for 212 min with a constant current of 1.25 ampere. [Assume that p_ka(\(H_{2}PO_{4}^{-}\)) = 7.2]

pH in 2^nd compartment cell(at cathode) is :

DIRECTIONS: Read the passage given below and answer the question that follow :A solution that is relatively resistant to change in pH is called a buffer solution. We can also say that the solution is buffered the simplest way to achieve substantial conc. of both acid and base in the same solution to use a conjugate acid-base pair. The most common form of buffer solution contains a weak acid and its conjugate base or a weak base and its conjugate acid.By using buffer concept. A student prepare 2L buffer solution of 0.330 M NaH₂PO₄ and 0.330 M Na₂HPO₄. The solution is divided in half between the two compartment (each containing 1L buffer)of an electrolytic cell, the electrodes used are Pt. Assume that the only reaction is the electrolysis of water. If electrolysis is carried out for 212 min with a constant current of 1.25 ampere. [Assume that p_ka(\(H_{2}PO_{4}^{-}\)) = 7.2]
pH in 1^st compartment cell (at anode) is :

Given:
E°_Fe³⁺/Fe = -0.036V
E°_Fe²⁺/Fe = -0.439V

The value of standard electrode potential for the change,
Fe³⁺(aq) + e^– Fe²⁺(aq) will be:

Molar conductivities(?°_m) at infinite dilution of NaCl, HCl and CH₃COONa are 126.4, 425.9 and 91.0 S cm² mol^– respectively. ?°_m for CH₃COOH will be :

Standard reduction potentials of the half reactions are given below :
F₂(g) + 2e^– ⟶ 2F^– (aq);E° = + 2.85 V
Cl₂(g) + 2e^– ⟶ 2Cl^–(aq); E° =+ 1.36 V
Br₂(l) + 2e^– ⟶ 2Br^–(aq);E° = + 1.06 V
I₂(s) + 2e^– ⟶ 2I^–(aq); E° = + 0.53 V
The strongest oxidising and reducing agents respectively are :