Which of the following ions displays the d-d transition and paramagnetism?
1. CrO42-
2. Cr2O72-
3. MnO4-
4. MnO42-
Subtopic:  d-Block Elements- Properties & Uses |
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Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code:

Column I Column II
a. Co3+  i. √8 B.M.
b. Cr3+ ii. √35 B.M.
c. Fe3+ iii. √15 B.M.
d. Ni2+ iv. √24 B.M.
 
a b c d
1. iv iii ii i
2. i ii iii iv
3. iv i ii iii
4. iii iv i ii

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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A gas that can readily decolorize an acidified KMnO4 solution is:

1. SO2

2. NO2

3. P2O5

4. CO2

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

1. HgI2, I-

2. HgI42-, I3-

3. Hg2I2, I-

4. HgI2, I3-

Subtopic:  d-Block Elements- Properties & Uses | Chemistry of Mn and Cr Compounds |
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The reason for greater range of oxidation states in actinoids is attributed to:

1. Actinoid Contraction

2. 5f, 6d and 7s levels having comparable energies.

3. 4f and 5d levels being close in energies.

4. The radioactive nature of actinoids

Subtopic:  d-Block Elements- Properties & Uses |
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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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Zinc can be coated on iron to produce galvanised iron, but the reverse is not possible because:

1. Zinc is lighter than iron.

2. Zinc has a lower melting point than iron.

3. Zinc has a lower negative reduction potential than iron.

4. Zinc has a higher negative reduction potential than iron.

Subtopic:  d-Block Elements- Properties & Uses |
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When copper is heated with conc. HNO3 it produces : 

1. Cu(NO3) and NO

2. Cu(NO3)2, NO and NO2

3. Cu(NO3)2 and N2O

4. Cu(NO3)2 and NO2

Subtopic:  d-Block Elements- Properties & Uses |
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