Q. No.Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers).
1. Ti (22) and Zr (40)
2. Zr (40) and Nb (41)
3. Zr (40) and Hf (72)
4. Zr (40) and Ta (73)
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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The incorrect statement among the following is:
| 1. | There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu. |
| 2. | Lanthanoid contraction is the accumulation of successive shrinkages. |
| 3. | As a result of lanthanoid contraction, the properties of the 4d series of the transition elements have no similarities with the 5d series of elements. |
| 4. | The shielding power of 4f electrons is quite weak. |
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