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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  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 Ï• denotes standard reduction potential, which is true:
•  E_cell^°= Ï•_L+ Ï•_R
•  E_cell^°= Ï•_R- Ï•_L
•  E_cell^°= Ï•_L- Ï•_R
•  E_cell^°=(Ï•_L+ Ï•_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 :
•  2Î»_(A^+)^∞ + Î»_(B^(-2))^∞
•  Î»_(A^+)^∞ +1/2 Î»_(B^(-2))^∞
•  1/2 Î»_(A^+)^∞ + Î»_(B^(-2))^∞
• Î»_(A^+)^∞ + Î»_(B^(-2))^∞
Solution
This is Kohlrausch law for  A-2-B type of electrolytes

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