E0 for Fe2+ + 2e → Fe is -0.44 volt and E0 for Zn2+ + 2e→ Zn is -0.76 volt, thus:
1. Zn is more electropositive than Fe
2. Fe is more electropositive than Zn
3. Zn is more electronegative
4. none of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe voltage of the cell given below increases due to:
Cell: Sn(s) + 2Ag+(aq) → Sn2+(aq) + 2Ag(s)
1. Increase in size of the silver rod.
2. Increase in the concentration of Sn2+ ions.
3. Increase in the concentration of Ag+ ions.
4. None of the above.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 5A current is passed through a solution of copper sulphate for 40 min. The amount of copper deposited at the cathode is
1. 40.65g
2. 0.45g
3. 3.94g
4. 65.04g
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology, the standard emf of the reaction
will be
1. 0.111V
2. 0.330V
3. 1.653V
4. 1.212V
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe standard electrode potential for Sn4+/Sn2+ couple is +0.15 V and that for the Cr3+/Cr couple is -0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will be:
1. +0.89 V
2. +0.18 V
3. +1.83 V
4. +1.199 V
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf an iron rod is dipped in CuSO4 solution, then:
1. Blue colour of the solution turns red.
2. Brown layer is deposited on iron rod.
3. No change occurs in the colour of the solution.
4. None of the above.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWithout losing it's concentration, ZnCl2 solution cannot be kept in contact with :
1. Au
2. Al
3. Pb
4. Ag
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAl2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 x 104 A of current is passed through molten Al2O3 for 6 h, what mass of aluminium is produced? (Assume 100% current efficiency, atomic mass of Al = 27g mol-1)
1. 9.0 x 103 g
2. 8.1 x 104 g
3. 2.4 x 105 g
4. 1.3 x 104 g
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe standard reduction potential at 290 K for the following half reactions are,
(i) Zn2+ + 2e— → Zn(s); E° = -0.762 V
(ii) Cr3+ + 3e → Cr(s); E° = -0.740 V
(iii) 2H+ + 2e → H2(g); · E° = +0.000 V
(iv) Fe3+ + e → Fe2+; E° = +0.77V
Which is the strongest reducing agent?
1. Zn
2. Cr
3. Fe2+
4. H2
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich graph correctly correlates Ecell as a function of concentrations for the cell (for different values of M and M') ?
1. 2.
3. 4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology