Q. No.Assuming complete ionization, same moles of which of the following compounds will require the the least amount of acidified KMnO4 for complex oxidation?
1.
2.
3.
4.
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2. Zr (40) and Nb (41)
3. Zr (40) and Hf (72)
4. Zr (40) and Ta (73)
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The reaction can go to completion by removing OH– ions by adding:
2. CO2
3. SO2
4. HCl
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Identify the alloy containing a non-metal as a constituent in it.
1. Invar
2. Steel
3. Bell metal
4. Bronze
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For the four successive transition elements (Cr, Mn, Fe and Co), the correct order of stability of +2 oxidation state among the following is:
(At. No Cr= 24, Mn= 25, Fe=26, Co= 27)
1. Fe>Mn>Co>Cr
2. Co>Mn>Fe>Cr
3. Cr>Mn>Co>Fe
4. Mn>Fe>Cr>Co
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The acidified \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) solution turns green when \(\mathrm{Na}_2 \mathrm{SO}_3\) is added to it. This is due to the formation of:
| 1. | \(\mathrm{CrO}_4^{2-} \) | 2. | \(\mathrm{Cr}_2 \mathrm({SO}_3)_3 \) |
| 3. | \(\mathrm{CrSO}_4 \) | 4. | \(\mathrm{Cr}_2 \mathrm({SO}_4)_3\) |
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A colored ion in aqueous solutions among the following is:
1. La3+ (Z=57)
2. Ti3+ (Z=22)
3. Lu3+ (Z=71)
4. Sc3+ (Z=21)
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1. Cr > Mn > V > Ti
2. V > Mn > Cr > Ti
3. Mn > Cr > Ti > V
4. Ti > V > Cr > Mn
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