How many cc of oxygen will be liberated by 2 A current flowing for 3 min 13 s through acidulated water?

• 11.2 cc

• 33.6 cc

• 44.8 cc

• 22.4 cc

Consider the following statements.
(1) Fuel cells are voltaic cell which convert electrical energy of fuel into chemical energy.

(2) Fuel cells are galvanic cells which convert chemical energy of fuel into electrical energy.

(3) The efficiency of H₂-O₂ fuel cell is approximately 25%.

(4) Fuel cells do not cause pollution problem.

Among these, the correct statements are

• (2) and (3) only

• (1) and (4) only

• (2) and (4) only

• (2), (3) and (4) only

The standard reduction potential E° for half-reactions are

Zn → Zn²⁺ + 2e^- ; E° = +0.76 V

Fe → Fe²⁺ + 2e^- ; E° = +0.41 V

The EMF of the cell reaction

Fe²⁺ + Zn → Zn²⁺ + Fe is

• +1.28 V

• -1.28 V

• +0.35 V

• -0.35 V

Certain electric current for half an hour can collect 11.2 L of hydrogen at NTP. Same current when passed through an electrolytic solution for one hour, can deposite how much silver?

• 216g

• 108 g

• 47 g

• 60 g

How much Coulomb needed to convert 1 mole of MnO₄
into Mn²⁺?

• 482500 C

• 193000 C

• 96500 C

• 36500 C

Aluminium is extracted by the electrolysis of

• alumina

• bauxite

• molten cryolite

• alumina mixed with molten cryolite

Saturated solution of KNO₃ is used to make salt bridge because

• KNO₃ is highly soluble in water

• velocity of K⁺ is greater than that of NO${}_3^{-}$

• Velocity of NO${}_3^{-}$ 1s greater than that of K⁺

• velocity of K⁺ and NO${}_3^{-}$ are almost equal

508.

Which of the following is a highly corrosive salt?

• FeCl₂

• PbCl₂

• Hg₂Cl₂

• HgCl₂

One Faraday of charge passes through solution of AgNO₃ and CuSO₄ connected in series and the concentration of two solutions being in the ratio 1 : 2. The ratio of amount of Ag and Cu deposited on Pt electrode is

• 1079.6354

• 54.3177

• 1079.3177

• 54.6354

On passing 0.5 Faraday of electricity through NaCl, the amount of Cl deposited on cathode is

• 35.5 g

• 17.75 g

• 71 g

• 142 g