Match the catalysts given in Column I with the processes given in Column II.

Column I - (Catalyst) Column II - (Process)
A. Ni in the presence of hydrogen 1. Contact process
B. Cu2Cl2 2. Vegetable oil to ghee
C. V2O5 3. Sandmeyer reaction
D. Finely divided iron 4. Haber's process
5.  Decomposition of  KClO3
 

Codes

A B C D
1. 3 4 2 5
2. 2 3 1 4
3. 5 4 3 2
4. 4 5 3 2

Subtopic:  d-Block Elements- Properties & Uses |
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The electronic configuration of gadolinium (atomic number of 64) is:

1. [Xe]4f35d56s2

2. [Xe]4f75d26s1

3. [Xe]4f75d16s2

4. [Xe]4f85d66s2

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The metallic radii of some transition elements are given below. An element that has the highest density is:

Element Fe Co Ni Cu
Metallic radii/pm 126 125 125 128

1. Fe 

2. Ni

3. Co

4. Cu

Subtopic:  d-Block Elements- Properties & Uses |
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Highest oxidation state of manganese in fluoride is +4 (MnF4) but the highest oxidation state in oxides is +7 (Mn2O7). The reason is :

1. Fluorine is more electronegative than oxygen.
2. Fluorine does not possess d orbitals.
3. Fluorine stabilizes lower oxidation state of Mn.
4. In covalent compounds, fluorine can only form a single bond while oxygen forms a double bond.

Subtopic:  Chemistry of Mn and Cr Compounds |
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Among the following, which are amphoteric oxides?

1. V2O5, Cr2O3
2. Mn2O7, CrO3
3. CrO, V2O5
4. V2O5, V2O4

Subtopic:  d-Block Elements- Properties & Uses |
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Colourless ion among the following is:

1. Cr+4 2. Sc+3
3. Ti+3 4. V+3
Subtopic:  d-Block Elements- Properties & Uses |
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AIPMT - 2000
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An element among the following that exhibits the maximum oxidation state is:

1. Cr

2. Mn

3. Fe

4. V

Subtopic:  d-Block Elements- Properties & Uses |
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AIPMT - 2000
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Mn2+ compounds are more stable than Fe2+ compounds towards oxidation in their +3 state because :

1. 3d5 configuration is more stable than 3d6 configuration.
2. 3d6 configuration is more stable than 3d5 configuration.
3. 3p5 configuration is less stable than 3p6 configuration.
4. 3p6 configuration is less stable than 3p5 configuration.

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The oxo metal anions of the 3d series in which the metal exhibits an oxidation state equal to its group number is /are -

1. VO3-

2. CrO42-

3. MnO4-

4. All of the above.

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What is the electronic configuration of transition elements?

1. \((n-1) d^{1-10} n s^{0-2} \) 2. \((n-1) d^{1-10} n s^2 \)
3. \(n f^2~ n p^{1-6} \) 4. \(n d^2~ n p^{1-6}\)
Subtopic:  d-Block Elements- Properties & Uses |
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