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Q. No.Given below are two statements:
Assertion (A):
Transition metals and their compounds are effective catalysts.
Reason (R):
They have the ability to adopt multiple oxidation states and to form complexes.
Choose the correct option:
1.
Both (A) and (R) are true and (R) is the correct explanation of (A).
2.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.
(A) is true but (R) is false.
4.
Both (A) and (R) are false.
Subtopic: d-Block Elements- Properties & Uses |
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The general electronic configuration for the 2nd-row transition series is:
| 1. | [Ne]3d1-10 4s2 | 2. | [Ar]3d1-10 4s1-2 |
| 3. | [Kr]4d1-10 5s1-2 | 4. | [Xe]5d1-10 5s1-2 |
Subtopic: d-Block Elements- Properties & Uses |
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Which of the following is a correct statement regarding transition elements ?
1. They exhibit diamagnetism.
2. They exhibit inert pair effect.
3. They do not form alloys.
4. They show variable oxidation states.
1. They exhibit diamagnetism.
2. They exhibit inert pair effect.
3. They do not form alloys.
4. They show variable oxidation states.
Subtopic: d-Block Elements- Properties & Uses |
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In the preparation of KMnO4, pyrolusite (MnO2) is first converted to dark green potassium manganate. In this conversion, the oxidation state of manganese changes from:
| 1. | +1 to +3 | 2. | +2 to +4 |
| 3. | +3 to +5 | 4. | +4 to +6 |
Subtopic: Chemistry of Mn and Cr Compounds |
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The coloured ion among the following is :
1. \(\mathrm{Cu}^{+} \)
2. \(\mathrm{Cu}^{2+} \)
3. \(\mathrm{Ti}^{4+} \)
4. \(\mathrm{V}^{5+} \)
1. \(\mathrm{Cu}^{+} \)
2. \(\mathrm{Cu}^{2+} \)
3. \(\mathrm{Ti}^{4+} \)
4. \(\mathrm{V}^{5+} \)
Subtopic: d-Block Elements- Properties & Uses |
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When potassium permanganate \(KMnO_4\) acts as an oxidizing agent, it eventually forms \(\mathrm{MnO}_4^{2-}, \mathrm{MnO}_2, \mathrm{Mn}_2 \mathrm{O}_3 \text { and } \mathrm{Mn}^{2+}\). What are the corresponding number of electrons transferred in each of these cases?
| 1. | 1, 3, 4, 5 | 2. | 3, 2, 1, 4 |
| 3. | 1, 5, 3, 7 | 4. | 4, 3, 2, 1 |
Subtopic: Chemistry of Mn and Cr Compounds |
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Which of the following complex ions has zero d-electrons in the central metal atom?
(At. number: Cr = 24, Mn = 25, Fe = 26, Co = 27)
(At. number: Cr = 24, Mn = 25, Fe = 26, Co = 27)
| 1. | \(\mathrm{[MnO_4]^-}\) | 2. | \(\mathrm{[Co(NH_3)_6]^{3+}}\) |
| 3. | \(\mathrm{[Fe(CN)_6]^{3-}}\) | 4. | \(\mathrm{[Cr(H_2O)_6]^{3+}}\) |
Subtopic: d-Block Elements- Properties & Uses |
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Given below are two statements:
In light of the above statements, choose the correct answer from the options given below:
| Assertion (A): | Zinc is not a transition metal. |
| Reason (R): | Zinc has a full d10 configuration in its ground state as well as in its common oxidation states. |
In light of the above statements, choose the correct answer from the options given below:
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: d-Block Elements- Properties & Uses |
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What substance is produced when potassium dichromate (K2Cr2O7) is added to ethanol (C2H5OH) in an acidic solution?
| 1. | \(\mathrm{C}_2 \mathrm{H}_6 \) | 2. | \(\mathrm{CH}_3 \mathrm{COOH} \) |
| 3. | \(\mathrm{K}^{+} \mathrm{C}_2 \mathrm{H}_5 \mathrm{O}^{-} \) | 4. | \(\mathrm{C}_2 \mathrm{H}_5 \mathrm{OC}_2 \mathrm{H}_5\) |
Subtopic: Chemistry of Mn and Cr Compounds |
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Match the statement given in Column I with the corresponding element given in Column II and mark the appropriate choice.
1. (A) → (i), (B) → (ii), (C) → (iii), (D) → (iv)
2. (A) → (ii), (B) → (iii), (C) → (iv), (D) → (i)
3. (A) → (iv), (B) → (i), (C) → (ii), (D) → (iii)
4. (A) → (iii), (B) → (iv), (C) → (ii), (D) → (i)
| Column I | Column II | ||
| (A) | An element that can show +8 oxidation state | (i) | Ce |
| (B) | An element with +7 as the most stable oxidation state in its oxides | (ii) | Pm |
| (C) | Radioactive lanthanoid | (iii) | Os |
| (D) | Lanthanoid which shows +4 oxidation state | (iv) | Mn |
2. (A) → (ii), (B) → (iii), (C) → (iv), (D) → (i)
3. (A) → (iv), (B) → (i), (C) → (ii), (D) → (iii)
4. (A) → (iii), (B) → (iv), (C) → (ii), (D) → (i)
Subtopic: f-Block Elements- Properties & Uses |
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