Q. No.A pair among the following have nearly the 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)
(Numbers in the parenthesis are atomic numbers).
2. Zr (40) and Nb (41)
3. Zr (40) and Hf (72)
4. Zr (40) and Ta (73)
Which of the following processes does not involve the oxidation of iron?
| 1. | Rusting of iron sheets |
| 2. | Decolourisation of blue CuSO4 solution by iron |
| 3. | Formation of Fe(CO)5 from Fe |
| 4. | Liberation of H2 from steam by iron at high temperature |
The number of d -electrons in Fe2+ (atomic number Z = 26) is different from the number of:
1. s-electrons in Mg (Z = 12)
2. p-electrons in Cl (Z = 17)
3. d-electrons in Fe (Z = 26)
4. p-electrons in Ne (Z = 10)
The pair of compounds that can exist together is:
1. FeCl3, SnCl2
2. HgCl, SnCl2
3. FeCl2, SnCl2
4. FeCl3, Kl
The reason for the lanthanoid contraction is:
1. negligible screening effect of 'f' orbitals.
2. increasing nuclear charge.
3. decreasing nuclear charge.
4. decreasing screening effect.
2. Na2S > CuS > ZnS
3. Na2S > ZnS > Cus
4. Cus > ZnS > Na2S
3 MnO 42– + 2 H 2 O ⇌ 2 MnO 4– + MnO 2 + 4 OH–
The reagent that facilitates the removal of OH– ions to ensure the completion of the conversion of K2MnO4 to KMnO4 is:
1. KOH
2. CO2
3. SO2
4. HCl
Which of the following statements is false?
| 1. | On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed. |
| 2. | Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis. |
| 3. | K2Cr2O7 solution in an acidic medium is orange. |
| 4. | K2Cr2O7 solution becomes yellow in increasing the pH beyond 7 |
For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order?
(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
| 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. | More active nature of the actinoids. |
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