Electrochemistry

During electrolysis of aqueous NaCl, the product formed at cathode is

• Na metal

• Cl2 gas

• H2 gas

• All of above

Answer explanation

Discharge potential of H us less than Na so H+ ion reduce before Na+ ion

The charge carry by 1 mole electron is

• 96500 C

• 9650 C

• 965 C

• 96.5 C

Answer explanation

1mole electron 6.02 × 10^23 × 1.6 × 10^-19 C = 96500C

Which is reversible electrode among following?

• Zn- electrode

• SHE

• Calomel electrode

• Cu - electrode

Correct statement/s among following is/are

• SHE can be used as cathode as well as anode

• Bye product of fuel cell used by astronauts for drinking purpose

• The potential difference between metal and its ions in aqueous solution is emf

• In dry cell graphite rod used as anode

During electroplating which metal covering is done on Fe

• Zn

• Mg

• Pb

• Sn

Which statement is incorrect for lead storage battery

• Spongy lead used as anode

• 68% sulphuric acid by mass is used as electrolyte

• Red lead oxide is used as anode

• Red lead oxide is used as cathode

During galvanization, Fe metal is covered with

• Zn metal

• Cu metal

• Mg metal

• Sn metal

Amount of Ca metal deposit at electrode during electrolysis of molten CaCl2 by 15A current for 20 minute is

• 3g approx

• 4g approx

• 5g approx

• 6g approx

At infinite dilution when dissociation is complete every ion make a definite contribution toward molar conductivity irrespective to the nature of other ion with which it is associated is

• Kohlraush's law

• Faraday's law

• Molar conductivity law

• Amonton's law

Which statement is incorrect regarding H2-O2 fuel cell

• H2 gas introduced from anode end

• O2 gas introduced from cathode end

• Molten KOH is used as electrolyte

• Water is end product of cell