Electrochemistr...

Corrosion of iron may be prevented by

Fuel cells are ________ that are designed to convert the energy of combustion of fuels like hydrogen, methane, methanol, etc. directly into_________.

The resistance of 0.01 N solution of an electrolyte was found to be 210 ohm at 298 K, using a conductivity cell of cell constant 0.66 cm⁻¹. The equivalent conductance of the solution is

In the primary batteries

Same amount of electric current is passed through solutions AgNO₃ and HCl. If 1.08 g of silver is obtained in the first case, the volume of hydrogen liberated at STP in the second case is

According to Faraday’s Second Law of Electrolysis, the amounts of different substances liberated by the same quantity of electricity passing through different  electrolytic solution connected in series are proportional to

When a rod of metallic lead was introduced into 0.01 M solution of Co (en)₂²⁺, it was found that 68% of the cobalt complex was reduced to Co (en)₃²⁺ by the lead. was -0.126 V.

of the reaction was

Why is KCl used in a salt bridge?

In an electrolysis of an aqueous solution of NaOH, 2.8 L of oxygen gas at STP was liberated at the anode. The volume of hydrogen gas at STP liberated at the cathode would be

Which of the following statements is correct about an electrolytic cell?

On passing electric current, the quantity of deposition of a metal on cathode depends on the

Calculate the mass of copper that will be deposited at the cathode in the electrolysis of a 0.2 M solution of copper sulphate when quantity of electricity equal to that required to liberate 2.24 L of hydrogen at NTP from a 0.1 M aqueous sulphuric acid is passed. (Atomic mass of Cu = 63.5 u) 

Consider the cell:

Cd (s) | Cd²⁺ (1.0 M) || Cu²⁺ (1.0 M) | Cu (s)

If we want to make a cell with a more positive voltage using the same substances, we should

If four moles of electrons are transferred from anode to cathode in an experiment on electrolysis of water, the total volume of the two gases produced at STP will be

In an electrolytic cell, which of the following statements is not true?

Salts of A (atomic weight 7), B (atomic weight 27) and C (atomic weight 24) were electrolysed under identical conditions using the same quantity of electricity. It was found that when 2.1 g of A was deposited, the weights of B and C deposited were 2.7 g and 3.6 g, respectively. The respective valencies of A, B and C are

Which of the following compounds is prepared on a large scale by the electrolysis of NaCl? 

Which of the following solutions is used as an anti-rusting solution? 

A secondary cell after use  can be ________ by passing current through it in the ________ so that it can be used again.

Which of the following statements regarding dilution of an electrolytic solution is correct?

In corrosion, a metal is ______ of electrons which --------- to form oxides and hydroxides.

A solution containing one mole per litre of each Cu(NO₃)₂, AgNO₃, Hg₂(NO₃)₂ and Mg(NO₃)₂, is electrolysed by using inert electrodes. The values of standard electrode potentials in volts are Ag/Ag⁺ = +0.80, 2Hg/Hg₂²⁺ = +0.79, Cu/Cu²⁺ = +0.34, Mg/Mg²⁺ = -2.37. With increasing voltage, the correct sequence of deposition of metals on the cathode will be

When electric current is passed through a cell having an electrolyte, the cations move towards the cathode and the anions towards the anode. If cathode is pulled out of the solution, then

How many hours does it take to reduce 3 mol of Fe³⁺ to Fe²⁺ with 2.0 A current? [F = 96500 C]

Which of the following metals forms a protective layer of oxide to prevent corrosion?