Actinide contraction is mainly related to:
1. Poor shielding by 5f subshell
2. Extraordinary decrement in Zeff
3. Both (1) and (2)
4. Strong shielding by 5f subshel

Subtopic:  Lanthanoid & Actinoids Contraction |
 61%
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From the following, which is the most basic hydroxide?

1. Ce(OH)3

2. Lu(OH)3

3. Yb(OH)3

4. Tb(OH)3

Subtopic:  f-Block Elements- Properties & Uses |
 61%
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Which is colorless in water?

1. Ti3+

2. V3+

3. Cr3+

4. Sc3+

Subtopic:  d-Block Elements- Properties & Uses |
 72%
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CrO42- and MnO4- are strong yellow and intense purple  respectively in aqueous solution The darkening of colour is due to

1. charge transfer

2. d-d transition

3. half-filled d-sub shells

4. increasing number of unpaired electron

Subtopic:  d-Block Elements- Properties & Uses |
 68%
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In the dichromate ion Cr2O72-,

1. 4 Cr-O bonds are equivalent

2. 6 Cr-O bonds are equivalent

3. All Cr-O bonds are equivalent

4. None of Cr-O bonds are equivalent

 

Subtopic:  Chemistry of Mn and Cr Compounds |
 62%
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The electronic configuration of a transition element X in +3 Oxidation state is [Ar]3d5.

The atomic number of X is :

1. 25

2. 26

3. 27

4. 24

Subtopic:  d-Block Elements- Properties & Uses |
 79%
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Magnetic moment of K3[Fe(CN)5(H2O)] is

1. 0

2. 4.92

3. 3.87

4. 2.83

Subtopic:  d-Block Elements- Properties & Uses |
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Lanthanoid which is radioactive is:

1. Promethium

2. Europium

3. Plutonium

4. Neptunium

Subtopic:  f-Block Elements- Properties & Uses |
 55%
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A pair of ions having similar magnetic moments is:

1. Ti3+,V3+

2. Cr3+,Mn2+

3. Mn2+,Fe3+

4. Fe2+,Mn2+

Subtopic:  d-Block Elements- Properties & Uses |
 75%
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Basic oxide amongst the following is:

1. CrO

2. Cr2O3

3. CrO3

4. Cr2O4

Subtopic:  d-Block Elements- Properties & Uses |
 63%
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