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Q1. How many atoms of calcium will be deposited from a solution of CaCl_2 by a current 0.25 mA flowing for 60 s?
  •  0.46 ×〖10〗^18
  •  1.24 ×〖10〗^18
  •  2.34 ×〖10〗^18
  •  4.68 ×〖10〗^18
Solution



Q2.Which is correct about fuel cells?
  •  These are used to provide power and drinking water to astronauts in space programme
  •  All of the above
  •  These are more efficient and free from pollution
  •  Cells continuously run as long as fuels are supplied
Solution
These are characteristics of fuel cells

Q3.  Aluminium oxide may be electrolysed at 1000℃ to furnish aluminium metal (atomic mass = 27 u; 1 F = 96500 C). The cathode reaction is Al^(3+)+〖3e〗^-⟶Al^0 To prepare 5.12 kg of aluminium metal by this method would require
  •   5.49 × 〖10〗^1 C of electricity
  •  5.49 × 〖10〗^4 C of electricity
  •  1.83 × 〖10〗^7 C of electricity
  •  5.49 × 〖10〗^7 C of electricity
Solution


Q4. In a galvanic cell, which is wrong?
  •  Anode has negative polarity
  •  Cathode has positive polarity
  •  Reduction takes place at cathode
  •  Reduction takes place at anode
Solution
Reduction is always carried out at cathode

Q5.Which of the following will form a cell with the highest voltage?
  •  2 M Ag^+,0.1 M Co^(2+)
  •  1 M Ag^+,1 M Co^(2+)
  •  2 M Ag^+,2 M Co^(2+)
  •  0.1 M Ag^+,2 M Co^(2+)
Solution
 



Q6. The oxidation potential of Mg and Al are + 2.37 and + 1.66 volt respectively. The Mg in chemical reactions :
  •  Will be replaced by Al
  •  Will replace Al
  • Will not be able to replace Al
  •  None of the above
Solution
Metal having higher E_OP^° replaces the other from its solution

Q7.The conductivity of strong electrolyte
  •  Depends upon density of electrolyte itself
  •  Does not change with dilution
  •  Increases on dilution slightly
  •  Decreases on dilution
Solution
C
Q8.If ϕ denotes standard reduction potential, which is true:
  •  E_cell^°= ϕ_L+ ϕ_R
  •  E_cell^°= ϕ_R- ϕ_L
  •  E_cell^°= ϕ_L- ϕ_R
  •  E_cell^°=(ϕ_L+ ϕ_R)
Solution

Q9.The standard electrode potential of hydrogen electrode at 1 M concentration and hydrogen gas at 1atm pressure is
  •  1 V
  •  6 V
  •  8 V
  •  0 V
Solution
D

Q10. According to Kohlrausch’s law the limiting value of equivalent conductivity of an electrolyte A_2 B is given by :
  •  2λ_(A^+)^∞ + λ_(B^(-2))^∞
  •  λ_(A^+)^∞ +1/2 λ_(B^(-2))^∞
  •  1/2 λ_(A^+)^∞ + λ_(B^(-2))^∞
  • λ_(A^+)^∞ + λ_(B^(-2))^∞
Solution
This is Kohlrausch law for a_2 b type of electrolytes

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