A substance is found to have a magnetic moment of 3.9 B.M. The ion may be 

(1) Fe+3

(2) Mn+2

(3) Co+2

(4) Cu+2

Subtopic:  d-Block Elements- Properties & Uses |
 77%
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When an excess of KCN is added to a solution of CuSO4, the final product obtained is :

1. K2[Cu(CN)4]

2. K3[Cu(CN)4]

3. CuCN

4. K[Cu(CN)2]

Subtopic:  Introduction, Classification and Nomenclature |
 57%
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Which of the following atomic numbers is not the atomic number of the inner transition element: 29, 59, 74, 95, 102, 104?

(1) 59

(2) 95

(3) 102

(4) 104

Subtopic:  Lanthanoid & Actinoids Contraction |
 60%
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Which of the following is the correct order of second ionization energy?

(1) V>Cr>Mn

(2) V<Cr<Mn

(3) V<Cr>Mn

(4) V>Cr<Mn

Subtopic:  d-Block Elements- Properties & Uses |
 67%
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When dimethyl glyoxime is subjected to reflux with pure nickel sheet pieces in an appropriate solvent for 10 minutes, what is the outcome?

(1) Red precipitate

(2) Blue precipitate

(3) Yellow precipitate

(4) No precipitate

Subtopic:  d-Block Elements- Properties & Uses |
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While Fe3+ is stable, Mn3+ is not stable in acidic solution because

(1) O2 oxidises Mn2+ to Mn3+

(2) O2 oxidises both Mn+2 to Mn+3 and Fe2+ to Fe3+

(3) Fe3+ oxidises H2O to O2

(4) Mn3+ oxidises H2O to O2

Subtopic:  d-Block Elements- Properties & Uses |
 55%
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The incorrect statement about Re-Re bonding in [Re2X8]2- is

(1) Re-Re bond length is abnormally short

(2) Re-Re bond is comprised of one σ, two π and one δ bond

(3) If Re-Re bond points along z-axis, then square planar ReX4 unit will use s, px, py and dx2-y2 orbitals for the formation of four Re-X σ bonds

(4) dxy orbitals will overlap to form δ-bond

Subtopic:  d-Block Elements- Properties & Uses |
 61%
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Choose the correct statement regarding bonding in AlCl3 at high temperatures?

(I) It contains 2c-2e- bond

(II) It contains 3c-4e- bond

(III) It contains co-ordinate bond

(1) (I), (II)

(2)  (II)

(3) (II), (III)

(4) (I), (II) & (III)

Subtopic:  d-Block Elements- Properties & Uses |
 52%
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Which of the following lanthanoid has highest tendency to form complexes?

(1) Ce+3

(2) Pm+2

(3) Lu+3

(4) Eu+2

Subtopic:  f-Block Elements- Properties & Uses |
 51%
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Cerium(Z=58) is an important member of lanthanoids. Which of the following statements about cerium is incorrect

(A) The common oxidation states of cerium are +3 and +4.

(B) Cerium (IV) acts as an oxidising agent

(C) The +4 oxidation state of cerium is not known in solutions

(D) The +3 oxidation state of cerium is more stable than the +4 oxidation state.

Subtopic:  f-Block Elements- Properties & Uses |
 65%
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