CBSE
Multiple Choice QuestionsIf equilibrium constant for reaction 2AB A2 + B2 is 49, then the equilibrium constant for reaction
AB A2 + B2, will be;
7
280
49
0.01
How many electrons are de! ivered at the cathode during electrolysis by a current of 1 A in 60 seconds?
3.74 x 1020
6.0 x 1023
7.48 x 1021
6.0 x 1020
At a particular temperature, the ratio of equivalent conductance to specific conductance of a 0.01 N NaCl solution is
105 cm3
103 cm3
10 cm3
105 cm2
The E° for half cells Fe/Fe2+ and Cu/Cu2+ are -0.44 V and +0.32 V respectively. Then :
Cu2+ oxidises Fe
Cu2+ oxidises Fe2+
Cu oxidises Fe2+
Cu reduces Fe2+
Assertion : Copper metal gets readily corroded is an acidic aqueous solution.
Reason : Free energy change for this process is positive.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Which of the following statements is true for the electrochemical Daniell cell?
Electrons flow from copper electrode to zinc electrode.
Current flows from zinc electrode to copper electrode.
Cations move toward copper electrode.
Cations move toward zinc electrode.
Assertion : Galvanised iron does not rust.
Reason : Zinc has a more negative electrode potential than iron.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Time required to deposit one millimole of aluminium metal by the passage of 9.65 amperes through aqueous solution of aluminium ion is
30 s
10 s
30,000 s
10,000 s
A spoon to be electroplated with gold should be
cathode
anode
electrolyte
none of these.
Which of the following reactions is used to make a fuel cell?
Cd(s) + 2Ni(OH)3 → CdO(s) + 2Ni(OH)2(s) + H2O(l)
Pb(s) + PbO2(s) + 2H2SO4(aq) → 2PbSO4(s) + 2H2O(l)
2H2(g) + O2(g) →6 2H2O(l)
2Fe(s) + O2(g) + 4H+ (aq) → 2Fe2+(aq) + 2H2O(l)
