Q. No.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.
Iron does not get oxidised in:
| 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 a high temperature |
The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution will be:
1. +2
2. +3
3. +4
4. +6
Which of the following is a result of the lanthanide contraction?
1. Zr and Y have nearly the same atomic radius.
2. Zr and Zn have the same oxidation state.
3. Zr and Hf have nearly the same atomic radius.
4. Zr and Nb have similar oxidation states.
Actinoids show a greater number of oxidation states than lanthanoids because:
| 1. | 4f- orbitals are more diffused than 5f-orbitals |
| 2. | Lesser energy difference between 5f, and 6d orbitals than between 4f, and 5d orbitals |
| 3. | More energy difference between 5f, and 6d orbitals than between 4f, and 5d orbitals |
| 4. | More reactive nature of the actinoids than the lanthanoids. |
Match the following characteristics to the appropriate metal:
| Column I - Aspects | Column II - Metal | ||
| (a) | The metal which reveals the maximum number of oxidation states | (i) | Scandium |
| (b) | The metal although placed in 3d block is considered not as a transition element | (ii) | Copper |
| (c) | The metal which does not exhibit variable oxidation states | (iii) | Manganese |
| (d) | The metal which in +1 oxidation state in aqueous solution undergoes disproportionation | (iv) | Zinc |
Select the correct option :
| (a) | (b) | (c) | (d) | |
| 1. | (i) | (iv) | (ii) | (iii) |
| 2. | (iii) | (iv) | (i) | (ii) |
| 3. | (iii) | (i) | (iv) | (ii) |
| 4. | (ii) | (iv) | (i) | (iii) |
Urea reacts with water to form A, which decomposes to form B. When B is passed through (aq), a deep blue-colored solution C is formed
The formula of C is:
2.
3.
4.
The values of X, Y, P, and Q are, respectively:
1. , Mn2O7, conc. H2SO4, and K2MnO4
2. K2MnO4, conc. H2SO4, Mn2O7, and
3. Na2CO3, MnO2, K2MnO4, and Mn2O7
4. H+, K2MnO4, , and Mn2O7
The increasing order of oxidising power among the following species is:
1. \(\mathrm{VO}_2^{+}<\mathrm{Cr}_2 \mathrm{O}_7^{2-}<\mathrm{MnO}_4^{-}\)
2. \(\mathrm{VO}_2^{+}<\mathrm{MnO}_4^{-}<\mathrm{Cr}_2 \mathrm{O}_7^{2-}\)
3. \(\mathrm{Cr}_2 \mathrm{O}_7^{2-}<\mathrm{VO}_2^{+}<\mathrm{MnO}_4^{-}\)
4. \(\mathrm{Cr}_2 \mathrm{O}_7{ }^{2-}<\mathrm{MnO}_4^{-}<\mathrm{VO}_2^{+}\)
A pair among the following that has both coloured ions in the aqueous solution is-
(At. no : Sc =21, Ti = 22, Ni = 28, Cu = 29, Co = 27)
| 1. | Ni2+, Ti3+ | 2. | Sc3+, Ti3+ |
| 3. | Sc3+, Co2+ | 4. | Ni2+, Cu+ |
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