Q. No.Which of the following element does not show a variable oxidation state?
1. Fe
2. Mn
3. Cu
4. Zn
1. Fe
2. Mn
3. Cu
4. Zn
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In dichromate dianion
1. 4 Cr – O bonds are equivalent
2. 6 Cr – O bonds are equivalent
3. All Cr – O bonds are equivalent
4. All Cr – O bonds are non equivalent
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Reason for lanthanoid contraction is:
1. Negligible screening effect of 'f' orbitals
2. Increasing nuclear charge
3. Decreasing nuclear charge
4. Decreasing screening effect
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Which of the statement is not true?
1. On passing through acidified solution, a milky colour is observed
2. is preffered over in volumetric analysis
3. solution in acidic medium is orange
4. solution becomes yellow in increasing the pH beyond 7
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It is because of-
| 1. | The greater metallic character of the lanthanoids than that of the corresponding actinoids. |
| 2. | More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals. |
| 3. | The lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals. |
| 4. | The more active nature of the actinoids. |
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