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Q. No.The point of dissimilarity between lanthanides and actinides is:
1.
Three outermost shells are partially filled.
2.
They show oxidation state of +3 (common).
3.
They are called inner transition elements.
4.
They are radioactive in nature.
Subtopic: f-Block Elements- Properties & Uses |
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Subtopic: d-Block Elements- Properties & Uses |
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| Statement 1: | Highest oxidation state of a metal is exhibited in its oxide or fluoride only. |
| Statement 2: | Both oxide and fluoride ions are able to oxidise metals. |
| 1. | Statement 1 is true, Statement 2 is false. |
| 2. | Statement 1 is false, Statement 2 is true. |
| 3. | Both Statements 1 and Statement 2 are true. |
| 4. | Both Statements 1 and Statement 2 are false. |
Subtopic: d-Block Elements- Properties & Uses |
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Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of:
| 1. | Lanthanoid contraction |
| 2. | Having similar chemical properties |
| 3. | Belonging to the same group |
| 4. | Diagonal relationship |
Subtopic: d-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |
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Consider the following graph.
Based on the graph above, it can be concluded that the element with a melting point higher than 3000 K will be:
| 1. | Y | 2. | X |
| 3. | Z | 4. | None of the above |
Subtopic: d-Block Elements- Properties & Uses |
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MnO2 when fused with KOH and oxidized in the air gives a dark green compound X. In an acidic solution, X undergoes disproportionation to give an intense purple compound Y and MnO2.
The compounds X and Y, respectively are:
1. Mn2O7 and KMnO4
2. K2MnO4 and KMnO4
3. KMnO4 and K2MnO4
4. KMnO4 and Mn2O7
The compounds X and Y, respectively are:
1. Mn2O7 and KMnO4
2. K2MnO4 and KMnO4
3. KMnO4 and K2MnO4
4. KMnO4 and Mn2O7
Subtopic: Chemistry of Mn and Cr Compounds |
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For M2+/M, and M3+/M2+, the values of some metals are given in the table below:
| Cr+2/Cr = -0.9 V | Cr+3/Cr+2 = -0.4V |
| Mn+2/Mn = -1.2V | Mn+3/Mn+2 = +1.5 V |
| Fe+2/Fe = -0.4V | Fe+3/Fe+2 = +0.8 V |
The correct inference(s) from the above data is/are:
| 1. | The increasing order of their stability is Mn3+< Fe3+< Cr3+ |
| 2. | The increasing order of the above-mentioned metals ability to get oxidized is: Fe < Cr < Mn |
| 3. | The increasing order of the above-mentioned metals ability to get oxidized is: Fe > Cr > Mn |
| 4. | Both 1 and 2 |
Subtopic: d-Block Elements- Properties & Uses |
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The reaction(s) involved in the preparation of potassium dichromate from iron chromite ore is/are:
| 1. | FeCr2O4 + NaOH + O2 → Na2CrO4 + Fe2O3 + H2O |
| 2. | Na2CrO4 + H2SO4 (conc.) → Na2Cr2O7 + Na2SO4 + H2O |
| 3. | Na2Cr2O7 + KCl→ K2Cr2O7 + NaCl |
| 4. | All of the above. |
Subtopic: Chemistry of Mn and Cr Compounds |
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The correct statement(s) about transition elements are:
| 1. | +2, and +3 oxidation states are more common for elements in the first transition series, while higher oxidation states are more common for the heavier elements. |
| 2. | The heavier transition elements form low-spin complexes only. |
| 3. | The atomic sizes of the elements of the first transition series are smaller than those of the heavier elements (elements of 2nd and 3r transition series). |
| 4. | All of the above. |
Subtopic: d-Block Elements- Properties & Uses |
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Match the List I with List II:
| List I (Metal ion ) |
List II (Number of unpaired electrons) |
| i. Mn3+ | a. 2 |
| ii. Cr3+ | b. 4 |
| iii. V3+ | c. 1 |
| iv. Ti3+ | d. 3 |
Choose the most appropriate options:
| i | ii | iii | iv | |
| 1. | c | d | b | a |
| 2. | b | d | a | c |
| 3. | d | b | a | c |
| 4. | b | d | c | a |
Subtopic: d-Block Elements- Properties & Uses |
82%
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