ELECTROCHEMISTRY
Quiz by RAJI ABISH
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- Q1
Given below are the standard electrode potentials of few half-cells. The correct order of these metals in increasing reducing power will beK+|K = –2.93 V, Ag+|Ag = 0.80 V, Mg2+|Mg = –2.37 V, Cr3+|Cr = –0.74 V
Ag < Cr < Mg < K
Mg < K < Cr < Ag
Cr < Ag < Mg < K
K < Mg < Cr < Ag
45s - Q2
Limiting molar conductivity for some ions is given below (in S cm2 mol–1) :Na+ - 50.1, Cl– - 76. 3, H+ - 349.6, CH3COO– - 40.9,Ca2+ - 119.0.
What will be the limiting molar conductivities (L°m) of CaCl2, CH3COONa and NaCl respectively?
271.6, 91.0 and 126.4 S cm2 mol–1
119.0, 1024.5 and 9.2 S cm2 mol–1
195.3, 182.0 and 26.2 S cm2 mol–1
97.65, 111.0 and 242.8 S cm2 mol–1
45s - Q3
A galvanic cell has electrical potential of 1.1 V. If an opposing potential of 1.1 V is applied to this cell, what will happen to the cell reaction and current flowing through the cell?
The concentration of reactants becomes unity and current flows from cathode to anode.
The reaction continuous but current flows in opposite direction.
The reaction stops and no current flows through the cell.
The cell does not function as a galvanic cell and zinc is deposited on zinc plate.
30s - Q4
In a Daniell cell,
the potential energy of the cell is converted into electrical energy.
the energy of the cell is utilised in conduction of the redox reaction
the electrical energy of the cell is converted to chemical energy
the chemical energy liberated during the redox reaction is converted to electrical energy
30s - Q5
When an aqueous solution of AgNO3 is electrolysed between platinum electrodes, the substances liberated at anode and cathode are
silver is deposited at cathode and H2 is liberated at anode
silver is deposited at cathode and Pt is dissolved in electrolyte.
silver is deposited at cathode and O2 is liberated at anode
hydrogen is liberated at cathode and O2 is liberated at anode
30s - Q6
A standard hydrogen electrode has a zero potential because
hydrogen can be most easily oxidised
hydrogen is the lightest element.
the electrode potential is assumed to be zero
hydrogen has only one electron
30s - Q7
At 25°C, Nernst equation is
30s - Q8
What will be the molar conductivity of Al3+ions at infinite dilution if molar conductivity of Al2(SO4)3 is 858 S cm2 mol–1 and ionic conductance of SO42– is 160 S cm2 mol–1 at infinite dilution?
698 S cm2 mol–1
429 S cm2 mol–1
189 S cm2 mol–1
1018 S cm2 mol–1
45s - Q9
E° value of Ni2+/ Ni is –0.25 V and Ag+ /Ag is +0.80 V. If a cell is made by taking the two electrodes what is the feasibility of the reaction?
Since E° value for the cell will be negative, redox reaction is not feasible.
Ag can reduce Ni2+ to Ni hence reaction is feasible.
Ni cannot reduce Ag+ to Ag hence reaction is not feasible
Since E° value for the cell will be positive, redox reaction is feasible.
30s - Q10
Molar conductivity of 0.15 M solution of KCl at 298 K, if its conductivity is 0.0152 S cm–1 will be
300 S cm2 mol–1
124 S cm2 mol–1
204 S cm2 mol–1
101 S cm2 mol–1
45s - Q11
Mark the correct choice of electrolytes represented in the graph.
A → NH4OH, B → NH4Cl
A → NH4OH, B → NaCl
A → CH3COOH, B → CH3COONa
A → KCl, B → NH4OH
30s - Q12
The graph of EMg2+|Mg vs log [Mg2+] is
30s - Q13
Assertion : The molar conductivity of strong electrolyte decreases with increase in concentration.
Reason : At high concentration, migration of ions is slow
Assertion is correct statement but reason is wrong statement.
Assertion is wrong statement but reason is correct statement.
Assertion and reason both are correct statements but reason is not correct explanation for assertion
Assertion and reason both are correct statements and reason is correct explanation for assertion
45s - Q14
Assertion : If standard reduction potential for the reaction, Ag+ + e– → Ag is 0.80 volt, then for the reaction, 2Ag+ + 2e– → 2Ag, it will be 1.60 volt.
Reason : If concentration of Ag+ ions is doubled, the standard electrode potential remains same.
Assertion and reason both are correct statements and reason is correct explanation for assertion
Assertion is correct statement but reason is wrong statement.
Assertion is wrong statement but reason is correct statement.
Assertion and reason both are correct statements but reason is not correct explanation for assertion
45s - Q15
Assertion : The conductivity of solution is greater than pure solvent. Reason : Conductivity depends upon number of the ions present in solution.
Assertion is correct statement but reason is wrong statement
Assertion is wrong statement but reason is correct statement.
Assertion and reason both are correct statements but reason is not correct explanation for assertion
Assertion and reason both are correct statements and reason is correct explanation for assertion.
45s
