General Science MCQ – 125 (Chemistry)

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1. The aqueous solution of which of the following compounds is the best conductor of electric current?
(A) Acetic acid
(B) Hydrochloric acid
(C) Ammonia
(D) Fructose

2. An increase in the conductivity equivalent of a solid electrolyte with dilution is primary due to?
(A) Increase ionic mobility of ions
(B) 100 percent electrolyte ionization with natural dilution
(C) Increase in both ion numbers and ionic mobility
(D) A rise in in counts

3. The equivalent conductance of Ba²⁺ and Cl^– are respectively 127 and 76 ohm^-1 cm^-1 eq^-1 at infinite dilution. The equivalent conductance of BaCl₂ at infinite dilution will be?
(A) 139.5
(B) 203
(C) 279
(D) 101.5

4. When heating one end of a metal plate, the other end gets hot because of?
(A) The resistance of the metal
(B) Mobility of atoms in the metal
(C) Energized electrons moving to the other end
(D) Minor perturbation in the energy of atoms

5. The weight of silver displaced by a quantity of electricity that displaces 5600ml of O2 at STP will be?
(A) 5.4 g
(B) 10.8 g
(C) 54.9 g
(D) 108.0 g

6. Once a current of 1.0 ampere was passed through one liter of CuCl₂ solution for 16 min and 5 sec, all of the solution’s copper was deposited at the cathode. The strength of solution CuCl₂ was (Molar mass of Cu = 63.5; Faraday constant = 96,500 C/mol)?
(A) 0.01 N
(B) 0.01 M
(C) 0.02 M
(D) 0.2 N

7. On electrolysis of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be?
(A) Hydrogen
(B) Oxygen
(C) Hydrogen sulfide
(D) Sulphur dioxide

8. A device that converts the energy of combustion of fields like hydrogen and methane directly into electrical energy is known as?
(A) Electrolytic cell
(B) Dynamo
(C) Ni-Cd cell
(D) Fuel cell

9. Which reaction is not feasible?
(A) 2KO + Br₂ → 2KBr + I₂
(B) 2KBr + I₂ → 2KI + Br₂
(C) 2KBr + Cl₂ → 2KCl + Br₂
(D) 2H₂O + 2F₂ → 4HF + O₂

10. Without losing its concentration ZnCl₂ solution cannot be kept in contact with?
(A) Au
(B) Al
(C) Pb
(D) Ag

General Science MCQ – 124 (Biology)