03. ELECTROCHEMISTRY
ELECTROCHEMISTRY

20070 A solution containing one mole per litre of each \(Cu{(N{O_3})_2},\,\,AgN{O_3},\,\,H{g_2}{(N{O_3})_2}\) and \(Mg{(N{O_3})_2},\) is being electrolysed by using inert electrodes. The values of standard electrode potentials in volts (reduction potentials) are \(Ag/A{g^ + } = + 0.80,\,\,2Hg/Hg_2^{2 + } = + 0.79,\,\,Cu/C{u^{2 + }} = + 0.34,\)\(Mg/M{g^{2 + }} = - 2.37\)with increasing voltage, the sequence of deposition of metals on the cathode will be

1 \(Ag,\,\,Hg,\,\,Cu,\,\,Mg\)
2 \(Mg,\,\,Cu,\,\,Hg,\,\,Ag\)
3 \(Ag,\,\,Hg,\,\,Cu\)
4 \(Cu,\,\,Hg,\,\,Ag\)
ELECTROCHEMISTRY

20071 The standard reduction electrode potentials of four elements are\(A = - 0.250\,V\)\(B = - 0.136\,V\)\(C = - 0.126\,V\)\(D = - 0.402\,V\)The element that displaces \(A\) from its compounds is

1 \(B\)
2 \(C\)
3 \(D\)
4 None of these
ELECTROCHEMISTRY

20072 The standard oxidation potential of zinc and silver in water at  \(298\,K\) are \(Zn\,\,(s)\,\, \to \,\,Z{n^{2 + }} + 2{e^ - }\,;\,E = 0.76\,V\)\(Ag\,\,(s)\,\, \to \,A{g^{2 + }} + 2{e^ - }\,;\,E =  - 0.80\,V\)  Which of the following reactions actually take place

1 \(Zn(s) + 2A{g^ + }(aq)\, \to \,Z{n^{ + + }}(aq) + 2Ag(s)\)
2 \(Z{n^{ + + }}(aq) + 2Ag(s)\, \to \,2A{g^ + }(aq) + Zn(s)\)
3 \(Zn(s) + Ag(s)\, \to \,Z{n^{ + + }}(aq) + A{g^ + }(aq)\)
4 \(Z{n^{ + + }}(aq) + A{g^ + }(aq)\, \to \,Zn(s) + Ag(s)\)
ELECTROCHEMISTRY

20073 Beryllium is placed above magnesium in the second group. Beryllium dust, therefore when added to \(MgC{l_2}\) solution will

1 Have no effect
2 Precipitate \(Mg\) metal
3 Precipitate \(MgO\)
4 Lead to dissolution of \(Be\) metal
ELECTROCHEMISTRY

20074 The name of equation showing relation between electrode potential \((E)\)standard electrode potential \(({E^o})\) and concentration of ions in solution is

1 Kohlrausch's equation
2 Nernst's equation
3 Ohm's equation
4 Faraday's equation
ELECTROCHEMISTRY

20070 A solution containing one mole per litre of each \(Cu{(N{O_3})_2},\,\,AgN{O_3},\,\,H{g_2}{(N{O_3})_2}\) and \(Mg{(N{O_3})_2},\) is being electrolysed by using inert electrodes. The values of standard electrode potentials in volts (reduction potentials) are \(Ag/A{g^ + } = + 0.80,\,\,2Hg/Hg_2^{2 + } = + 0.79,\,\,Cu/C{u^{2 + }} = + 0.34,\)\(Mg/M{g^{2 + }} = - 2.37\)with increasing voltage, the sequence of deposition of metals on the cathode will be

1 \(Ag,\,\,Hg,\,\,Cu,\,\,Mg\)
2 \(Mg,\,\,Cu,\,\,Hg,\,\,Ag\)
3 \(Ag,\,\,Hg,\,\,Cu\)
4 \(Cu,\,\,Hg,\,\,Ag\)
ELECTROCHEMISTRY

20071 The standard reduction electrode potentials of four elements are\(A = - 0.250\,V\)\(B = - 0.136\,V\)\(C = - 0.126\,V\)\(D = - 0.402\,V\)The element that displaces \(A\) from its compounds is

1 \(B\)
2 \(C\)
3 \(D\)
4 None of these
ELECTROCHEMISTRY

20072 The standard oxidation potential of zinc and silver in water at  \(298\,K\) are \(Zn\,\,(s)\,\, \to \,\,Z{n^{2 + }} + 2{e^ - }\,;\,E = 0.76\,V\)\(Ag\,\,(s)\,\, \to \,A{g^{2 + }} + 2{e^ - }\,;\,E =  - 0.80\,V\)  Which of the following reactions actually take place

1 \(Zn(s) + 2A{g^ + }(aq)\, \to \,Z{n^{ + + }}(aq) + 2Ag(s)\)
2 \(Z{n^{ + + }}(aq) + 2Ag(s)\, \to \,2A{g^ + }(aq) + Zn(s)\)
3 \(Zn(s) + Ag(s)\, \to \,Z{n^{ + + }}(aq) + A{g^ + }(aq)\)
4 \(Z{n^{ + + }}(aq) + A{g^ + }(aq)\, \to \,Zn(s) + Ag(s)\)
ELECTROCHEMISTRY

20073 Beryllium is placed above magnesium in the second group. Beryllium dust, therefore when added to \(MgC{l_2}\) solution will

1 Have no effect
2 Precipitate \(Mg\) metal
3 Precipitate \(MgO\)
4 Lead to dissolution of \(Be\) metal
ELECTROCHEMISTRY

20074 The name of equation showing relation between electrode potential \((E)\)standard electrode potential \(({E^o})\) and concentration of ions in solution is

1 Kohlrausch's equation
2 Nernst's equation
3 Ohm's equation
4 Faraday's equation
ELECTROCHEMISTRY

20070 A solution containing one mole per litre of each \(Cu{(N{O_3})_2},\,\,AgN{O_3},\,\,H{g_2}{(N{O_3})_2}\) and \(Mg{(N{O_3})_2},\) is being electrolysed by using inert electrodes. The values of standard electrode potentials in volts (reduction potentials) are \(Ag/A{g^ + } = + 0.80,\,\,2Hg/Hg_2^{2 + } = + 0.79,\,\,Cu/C{u^{2 + }} = + 0.34,\)\(Mg/M{g^{2 + }} = - 2.37\)with increasing voltage, the sequence of deposition of metals on the cathode will be

1 \(Ag,\,\,Hg,\,\,Cu,\,\,Mg\)
2 \(Mg,\,\,Cu,\,\,Hg,\,\,Ag\)
3 \(Ag,\,\,Hg,\,\,Cu\)
4 \(Cu,\,\,Hg,\,\,Ag\)
ELECTROCHEMISTRY

20071 The standard reduction electrode potentials of four elements are\(A = - 0.250\,V\)\(B = - 0.136\,V\)\(C = - 0.126\,V\)\(D = - 0.402\,V\)The element that displaces \(A\) from its compounds is

1 \(B\)
2 \(C\)
3 \(D\)
4 None of these
ELECTROCHEMISTRY

20072 The standard oxidation potential of zinc and silver in water at  \(298\,K\) are \(Zn\,\,(s)\,\, \to \,\,Z{n^{2 + }} + 2{e^ - }\,;\,E = 0.76\,V\)\(Ag\,\,(s)\,\, \to \,A{g^{2 + }} + 2{e^ - }\,;\,E =  - 0.80\,V\)  Which of the following reactions actually take place

1 \(Zn(s) + 2A{g^ + }(aq)\, \to \,Z{n^{ + + }}(aq) + 2Ag(s)\)
2 \(Z{n^{ + + }}(aq) + 2Ag(s)\, \to \,2A{g^ + }(aq) + Zn(s)\)
3 \(Zn(s) + Ag(s)\, \to \,Z{n^{ + + }}(aq) + A{g^ + }(aq)\)
4 \(Z{n^{ + + }}(aq) + A{g^ + }(aq)\, \to \,Zn(s) + Ag(s)\)
ELECTROCHEMISTRY

20073 Beryllium is placed above magnesium in the second group. Beryllium dust, therefore when added to \(MgC{l_2}\) solution will

1 Have no effect
2 Precipitate \(Mg\) metal
3 Precipitate \(MgO\)
4 Lead to dissolution of \(Be\) metal
ELECTROCHEMISTRY

20074 The name of equation showing relation between electrode potential \((E)\)standard electrode potential \(({E^o})\) and concentration of ions in solution is

1 Kohlrausch's equation
2 Nernst's equation
3 Ohm's equation
4 Faraday's equation
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
ELECTROCHEMISTRY

20070 A solution containing one mole per litre of each \(Cu{(N{O_3})_2},\,\,AgN{O_3},\,\,H{g_2}{(N{O_3})_2}\) and \(Mg{(N{O_3})_2},\) is being electrolysed by using inert electrodes. The values of standard electrode potentials in volts (reduction potentials) are \(Ag/A{g^ + } = + 0.80,\,\,2Hg/Hg_2^{2 + } = + 0.79,\,\,Cu/C{u^{2 + }} = + 0.34,\)\(Mg/M{g^{2 + }} = - 2.37\)with increasing voltage, the sequence of deposition of metals on the cathode will be

1 \(Ag,\,\,Hg,\,\,Cu,\,\,Mg\)
2 \(Mg,\,\,Cu,\,\,Hg,\,\,Ag\)
3 \(Ag,\,\,Hg,\,\,Cu\)
4 \(Cu,\,\,Hg,\,\,Ag\)
ELECTROCHEMISTRY

20071 The standard reduction electrode potentials of four elements are\(A = - 0.250\,V\)\(B = - 0.136\,V\)\(C = - 0.126\,V\)\(D = - 0.402\,V\)The element that displaces \(A\) from its compounds is

1 \(B\)
2 \(C\)
3 \(D\)
4 None of these
ELECTROCHEMISTRY

20072 The standard oxidation potential of zinc and silver in water at  \(298\,K\) are \(Zn\,\,(s)\,\, \to \,\,Z{n^{2 + }} + 2{e^ - }\,;\,E = 0.76\,V\)\(Ag\,\,(s)\,\, \to \,A{g^{2 + }} + 2{e^ - }\,;\,E =  - 0.80\,V\)  Which of the following reactions actually take place

1 \(Zn(s) + 2A{g^ + }(aq)\, \to \,Z{n^{ + + }}(aq) + 2Ag(s)\)
2 \(Z{n^{ + + }}(aq) + 2Ag(s)\, \to \,2A{g^ + }(aq) + Zn(s)\)
3 \(Zn(s) + Ag(s)\, \to \,Z{n^{ + + }}(aq) + A{g^ + }(aq)\)
4 \(Z{n^{ + + }}(aq) + A{g^ + }(aq)\, \to \,Zn(s) + Ag(s)\)
ELECTROCHEMISTRY

20073 Beryllium is placed above magnesium in the second group. Beryllium dust, therefore when added to \(MgC{l_2}\) solution will

1 Have no effect
2 Precipitate \(Mg\) metal
3 Precipitate \(MgO\)
4 Lead to dissolution of \(Be\) metal
ELECTROCHEMISTRY

20074 The name of equation showing relation between electrode potential \((E)\)standard electrode potential \(({E^o})\) and concentration of ions in solution is

1 Kohlrausch's equation
2 Nernst's equation
3 Ohm's equation
4 Faraday's equation
ELECTROCHEMISTRY

20070 A solution containing one mole per litre of each \(Cu{(N{O_3})_2},\,\,AgN{O_3},\,\,H{g_2}{(N{O_3})_2}\) and \(Mg{(N{O_3})_2},\) is being electrolysed by using inert electrodes. The values of standard electrode potentials in volts (reduction potentials) are \(Ag/A{g^ + } = + 0.80,\,\,2Hg/Hg_2^{2 + } = + 0.79,\,\,Cu/C{u^{2 + }} = + 0.34,\)\(Mg/M{g^{2 + }} = - 2.37\)with increasing voltage, the sequence of deposition of metals on the cathode will be

1 \(Ag,\,\,Hg,\,\,Cu,\,\,Mg\)
2 \(Mg,\,\,Cu,\,\,Hg,\,\,Ag\)
3 \(Ag,\,\,Hg,\,\,Cu\)
4 \(Cu,\,\,Hg,\,\,Ag\)
ELECTROCHEMISTRY

20071 The standard reduction electrode potentials of four elements are\(A = - 0.250\,V\)\(B = - 0.136\,V\)\(C = - 0.126\,V\)\(D = - 0.402\,V\)The element that displaces \(A\) from its compounds is

1 \(B\)
2 \(C\)
3 \(D\)
4 None of these
ELECTROCHEMISTRY

20072 The standard oxidation potential of zinc and silver in water at  \(298\,K\) are \(Zn\,\,(s)\,\, \to \,\,Z{n^{2 + }} + 2{e^ - }\,;\,E = 0.76\,V\)\(Ag\,\,(s)\,\, \to \,A{g^{2 + }} + 2{e^ - }\,;\,E =  - 0.80\,V\)  Which of the following reactions actually take place

1 \(Zn(s) + 2A{g^ + }(aq)\, \to \,Z{n^{ + + }}(aq) + 2Ag(s)\)
2 \(Z{n^{ + + }}(aq) + 2Ag(s)\, \to \,2A{g^ + }(aq) + Zn(s)\)
3 \(Zn(s) + Ag(s)\, \to \,Z{n^{ + + }}(aq) + A{g^ + }(aq)\)
4 \(Z{n^{ + + }}(aq) + A{g^ + }(aq)\, \to \,Zn(s) + Ag(s)\)
ELECTROCHEMISTRY

20073 Beryllium is placed above magnesium in the second group. Beryllium dust, therefore when added to \(MgC{l_2}\) solution will

1 Have no effect
2 Precipitate \(Mg\) metal
3 Precipitate \(MgO\)
4 Lead to dissolution of \(Be\) metal
ELECTROCHEMISTRY

20074 The name of equation showing relation between electrode potential \((E)\)standard electrode potential \(({E^o})\) and concentration of ions in solution is

1 Kohlrausch's equation
2 Nernst's equation
3 Ohm's equation
4 Faraday's equation