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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Which of the following elements has the strongest metallic bond?

1. Fe 2. Sc
3. V 4. Cr
Subtopic:  d-Block Elements- Properties & Uses |
 56%
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The ionization potential values of d-block elements as compared to the ionization potential values of f-block elements are:

1. Higher 2. Equal
3. Lower 4. Can't compare.
Subtopic:  d-Block Elements- Properties & Uses |
 68%
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The incorrect statement among the following regarding Cerium is :  

1. The +4 oxidation state of cerium is not known in solutions.
2. The +3 oxidation state of cerium is more stable than the +4 oxidation state.
3. The common oxidation states of cerium are +3, and +4.
4. Cerium (IV) acts as an oxidizing agent.

Subtopic:  Lanthanoid & Actinoids Contraction |
 64%
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