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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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 |
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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

Subtopic:  d-Block Elements- Properties & Uses |
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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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Name the gas that can readily decolourise acidified KMnO4 solution.

(1) CO2           

(2) SO2           

(3) NO2             

(4) P2O5

Subtopic:  d-Block Elements- Properties & Uses | Chemistry of Mn and Cr Compounds |
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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-

Subtopic:  d-Block Elements- Properties & Uses | Chemistry of Mn and Cr Compounds |
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Which one of the following statements related to lanthanons is incorrect?

(1) Europium shows +2 oxidation state

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

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

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

Subtopic:  f-Block Elements- Properties & Uses |
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Which one of the following statements is correct when SO2 is passed through acidified

K2Cr2O7 solution?

1. The solution is decolourized

2. SO2 is reduced

3. Green Cr2(SO4)3 is formed

4. The solution turns blue

Subtopic:  Chemistry of Mn and Cr Compounds |
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