Which of the following element does not show the variable oxidation state?

1. Fe

2. Mn

3. Cu

4. Zn

Subtopic:  d-Block Elements- Properties & Uses |
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With F highest stable oxidation state of Mn is

1. +6

2. +4

3. +7

4. +3

Subtopic:  d-Block Elements- Properties & Uses |
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Cr2O72-+XH+Cr3++H2O + oxidized product of X. X in the above reaction cannot be

1. C2O42-

2. Fe2+

3. SO42-

4. S2-

Subtopic:  Chemistry of Mn and Cr Compounds |
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Basic oxide amongst the following is:

1. CrO

2. Cr2O3

3. CrO3

4. Cr2O4

Subtopic:  d-Block Elements- Properties & Uses |
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The pair having similar magnetic moment is

1. Ti3+,V3+

2. Cr3+,Mn2+

3. Mn2+,Fe3+

4. Fe2+,Mn2+

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 |
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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 subshell

Subtopic:  Lanthanoid & Actinoids Contraction |
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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 |
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Which is colorless in water?

1. Ti3+

2. V3+

3. Cr3+

4. Sc3+

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