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Q. No.

Which has highest melting point?

1. Cr

2. Fe

3. Cu

4. Mo

Subtopic:  d-Block Elements- Properties & Uses |
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The colour of KMnO4 is due to

1. d – d transition

2. Charge transfer spectra

3. Polarisation of ion

4. p – d transition

Subtopic:  Chemistry of Mn and Cr Compounds |
 68%

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

1. Fe

2. Mn

3. Cu

4. Zn

Subtopic:  d-Block Elements- Properties & Uses |
 88%
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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- + X →H+ Cr3+ + H2O + oxidised product of X
X in the above reaction can not be:
 

1. C2O42-

2. Fe2+

3. SO42-

4. S2-

Subtopic:  Chemistry of Mn and Cr Compounds |
 61%
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Lanthanoid which is radioactive is

1. Promethium

2. Europium

3. Plutonium

4. Neptunium

Subtopic:  f-Block Elements- Properties & Uses |
 64%

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In dichromate dianion

1. 4 Cr – O bonds are equivalent

2. 6 Cr – O bonds are equivalent

3. All Cr – O bonds are equivalent

4. All Cr – O bonds are non equivalent

Subtopic:  Chemistry of Mn and Cr Compounds |
 66%
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Basic oxide is

1. CrO

2. Cr2O3

3. CrO3

4. Cr2O4

Subtopic:  Chemistry of Mn and Cr Compounds |
 74%
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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 |
 82%
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Reason for lanthanoid contraction is:

1. Negligible screening effect of 'f' orbitals

2. Increasing nuclear charge

3. Decreasing nuclear charge

4. Decreasing screening effect

Subtopic:  f-Block Elements- Properties & Uses |
 75%
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