Which of the following solutions has the highest equivalent conductance?
1. 0.01 M NaCl
2. 0.05 M NaCl
3. 0.005 M NaCl
4. 0.02 M NaCl
A solution of Na2SO4 in water is electrolyzed using pt electrodes. The products at the cathode and are respectively
1. H2, SO2
2. O2, NaOH
3. H2, O2
4. O2, SO2
The reduction potential of the two half cell
reactions (occuring in an electrochemical cell)
are
The feasible reaction will be
1.
2.
3.
4.
Given that
The most reactive metal which displaces other metals from their salts in solution is
1. Ag
2. Cu
3. Co
4. Zn
The emf of the cell
Tl | Tl+(0.001 M) || Cu2+ (1M) | Cu is 0.83V. The
emf of this cell could be increased by
1. Increasing in the concentration of Tl+
ions
2. Increasing in the concentration of Cu+
ions
3. Increasing in the concentration of both
4. None of the above
Zinc is used to protect corrosion of iron because
1. Eoxi of Zn < Eoxi of iron
2. Ered of Zn < Ered of iron
3. Zn is cheaper than iron
4. Zn is abundantly avalable
For a reaction, A(s) + 2B+ A2+ + 2B(s) ; KC has been found to be 1012. The is
1. 0.354 V
2. 0.708V
3. 0.0098 V
4. 1.36V
The solution of nickel sulphate in which nickel rod dipped is diluted to 10 times. The potential of nickel
1. Decreases by 60 mV
2. Increases by 30 mV
3. Decreases by 30 mV
4. Decreases by 60 mV
Pick out the incorrect statement
1. Equivalent conductance increase with dilution
2. Molar conductance increase with dilution
3. Specific conductance increase with dilution
4. Specific resistance increase with dilution
In passing 3 faraday of electricity through the
three electrolytic cells connected in series
containing Ag+, Cu2+ and Al3+ respectively. The
molar ratio in which the three metal ions are
liberated at the electrode is
1. 1 : 2 : 3
2. 3 : 2 : 1
3. 6 : 3 : 2
4. 3 : 4 : 2
Given that
Predict which of the following is true
1. I¯ ions will be able to reduce bromine
2. Br¯ ion will be able to reduce iodine
3. Iodine will be able to reduce bromide ions
4. Bromine will be able to reduce iodide ions
The potential of a hydrogen electrode having a pH = 10 is :
1. 0.59 V
2. –0.59 V
3. 0.0 V
4. –5.9 V
Zinc gives H2 with H2SO4 and HCl but not with HNO3
because
1. Zinc acts as oxidising agent when reacts with
HNO3
2. HNO3 is a weaker acid then H2SO4 and HCl
3. In electrochemical series zinc is above hydrogen
4. is reduced is preference to hydronium ion
An aqueous solution containing one mole per
litre of each is
being electrolysed using inert electrodes.
The values of standard electrode potential in
volts (reduction potential) are
Ag | Ag+ = +0.80 2Hg | Hg2+ = +0.79
Cu | Cu2+ = +0.34 Mg | Mg2+ = –2.37
With increasing voltage, the sequence of
deposition of metals on cathode will be
1. Ag, Hg, Cu, Mg
2. Mg, Cu, Hg, Ag
3. Ag, Hg, Cu
4. Cu, Hg, Ag
Standard electrode potential data are useful for
understanding the suitability of an oxidant in
aredox titration. Some half cell reactions and
their standard potential are given below
Identify the only incorrect statement regarding
the quantitative estimation of aqueous Fe(NO3)2
1. can be used in aqueous HCl
2. can be used in aqueous HCl
3. can be used in aqueous H2SO4
4. can be used in aqueous H2SO4