Standard Reduction electrode potential of three metals X, Y, and Z are -1.2 V, +0.5 V and -3 V respectively. The reducing power of these metals will be :
1. | Y > X >Z | 2. | Z > X > Y |
3. | X > Y > Z | 4. | Y > Z > X |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhen a copper wire is immersed in a solution of AgNO3, the colour of the solution becomes blue because copper:
1. Forms a soluble complex with \(AgNO_3\)
2. Is oxidised to \(Cu^{2+}\)
3. Is reduced to \(Cu^{2-}\)
4. Splits up into atomic form and dissolves
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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 & BiologyA hypothetical electrochemical cell is shown below.
A|A+(x M) || B+(y M)|B
The Emf measured is +0.20 V. The cell reaction is:
1. A+ + B → A + B+
2. A+ + e- → A ; B+ + e- → B
3. The cell reaction cannot be predicted.
4. A + B+ → A+ + B
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe negative sign in the expression EoZn2+/Zn = -0.76 V indicates :
1. Metal reactivity increases.
2. Metal reactivity decreases.
3. No effect on metal.
4. None of the above.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe most stable oxidized species among the following is:
\(E_{{\mathrm{Cr}_2 \mathrm{O}_7^2}/ \mathrm{Cr}^{3+}}^{o} =1.33 \mathrm{~V} ; E_{\mathrm{Cl}_2 / \mathrm{Cl}^{-}}^{o}=1.36 \mathrm{~V} \)
\( E_{\mathrm{MnO_{4}}^{-} / \mathrm{Mn}^{2+}}^{o}=1.51 \mathrm{~V} ; E_{\mathrm{Cr}^{3+} / \mathrm{Cr}}^{o}=-0.74 \mathrm{~V}\)
1. | Cr3+ | 2. | MnO4- |
3. | Cr2O72- | 4. | Mn2+ |
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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 & BiologyA solution containing one mole per litre each of Cu(NO3)2, AgNO3, Hg2(NO3)2 and Mg(NO3)2 is being electrolyzed by using inert electrodes. The values of standard electrode potentials in volt (reduction potentials) are,
Ag+ /Ag = 0.80 V, /2Hg = 0.79 V,
Cu2+/Cu = +0.34 V and Mg2+/Mg = -2.37 V
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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology