Assertion: Eo for Mn3+/Mn2+ couple is more positive than for Fe3+/Fe2+.

Reason: Mn3+ has d4 configuration and Fe3+ has a d5 configuration.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Subtopic:  d-Block Elements- Properties & Uses |
 79%
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Assertion: Transition metals exhibit higher enthalpies of atomization.

Reason: The atoms of transition metals are held together by strong metallic bonds.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  d-Block Elements- Properties & Uses |
 88%
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Assertion : The transition elements form interstitial compounds.

Reason: Steel and cast iron are hard due to the formation of an interstitial compound with carbon.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  d-Block Elements- Properties & Uses |
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When iron becomes passive by "X", it is due to the formation of "Y". X and Y, respectively, are:

1. Dil. HCl, Fe2O3

2. 80% Conc. HNO3, Fe3O4

3. Conc. H2SO4, Fe3O4

4. Conc. HCl, Fe3O4

Subtopic:  d-Block Elements- Properties & Uses |
 60%
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When KMnO4 solution is added to hot oxalic acid solution, the decolorization is slow in the beginning but becomes instantaneous after some time. This is because : 

1. Mn2+ acts as auto catalyst.

2. CO2 is formed.

3. Reaction is exothermic.

4. MnO4- catalyses the reaction.

Subtopic:  d-Block Elements- Properties & Uses | Chemistry of Mn and Cr Compounds |
 65%
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Which of the following statements is false? 

1. MnO2 dissolves in conc. HCl, but does not form Mn4+ ions.
2. MnO2 oxidizes hot concentrated H2SO4 liberating oxygen.
3. K2MnO4 is formed when MnO2 infused KOH is oxidized by air, KNO3, PbO2 or NaBiO3
4. The decomposition of acidic KMnO4 is not catalyzed by sunlight.

Subtopic:  d-Block Elements- Properties & Uses |
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The addition of non-metals like B and C to the interstitial sites of a transition metal increases

1. Ductility

2. Melting Point

3. Shining

4. Conductivity

Subtopic:  d-Block Elements- Properties & Uses |
 68%
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Which of the following metals does not form amalgam?

1. Fe

2. Au

3. Zn

4. Ag

Subtopic:  d-Block Elements- Properties & Uses |
 61%
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The element of the first transition series having lowest oxidation potential value (MM2++2e-) is -

1. Mn

2. Fe

3. Ni

4. Cu

Subtopic:  d-Block Elements- Properties & Uses |
 53%
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The incorrect statement among the following about the chemistry of 3d and 4f series elements is 

1. 3d elements show more oxidation states than 4f series elements.
2. The energy difference between 3d and 4s orbitals is very little.
3. Europium (ll) is more stable than Ce (ll).
4. The paramagnetic character of the 3d series elements increases from scandium to copper.

Subtopic:  d-Block Elements- Properties & Uses |
 62%
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