Magnetic moment of K3[Fe(CN)5(H2O)] is

1. 0

2. 4.92

3. 3.87

4. 2.83

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
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Electronic configuration of a transition element X in +3 Oxidation state is [Ar]3d5. What is its atomic number?

1. 25

2. 26

3. 27

4. 24

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d-Block Elements,Physical and Chemical properties.
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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

 

Concept Questions :-

Chemistry of KMnO4, K2Cr2O7 & CrO5 and others
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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

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
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The main reason for a larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids is

1. The lesser energy difference between 5f and 6d orbitals than 4f and 5d orbitals

2. Larger atomic size of actinoids than the lanthanoids

3. More energy difference between 5f and 6d orbitals than between 4f and 5d orbitals

4. Greater reactive nature of the actinoids than the lanthanoids

Concept Questions :-

f-Block Elements,Physical and Chemical properties
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Which is colourless in water?

1. Ti3+

2. V3+

3. Cr3+

4. Sc3+

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d-Block Elements,Physical and Chemical properties.
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Which of the following is most basic?

1. Ce(OH)3

2. Lu(OH)3

3. Yb(OH)3

4. Tb(OH)3

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f-Block Elements,Physical and Chemical properties
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Name the gas that can readily decolourise acidified KMnO4 solution.

(a) CO2            (b) SO2            (c) NO2              (d) P2O5

Concept Questions :-

Chemistry of KMnO4, K2Cr2O7 & CrO5 and others
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HgCl2 and I2 both when dissolved in water containing I- ions the pair of species formed is

(a) HgI2I3-                              (b) HgI2, I-

(c) HgI42-, I3-                             (d) Hg2I2, I-

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d-Block Elements,Physical and Chemical properties.
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Which one of the following statements related to lanthanons is incorrect?

(a) Europium shows +2 oxidation state

(b) The basicity decreases as the ionic radius decreases from Pr to Lu

(c) All the lanthanons are much more reactive than aluminium

(d) Ce (+4) solutuion are widely used as oxidising agent in volumetric analysis

Concept Questions :-

f-Block Elements,Physical and Chemical properties
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