The calculated spin only magnetic moment of Cr2+ ion is:

1. 4.90 BM

2. 5.92 BM

3. 2.84 BM

4. 3.87 BM

Subtopic:  d-Block Elements- Properties & Uses |
 75%
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Identify the incorrect statement.

1. The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes. 
2. Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
3. The oxidation states of chromium in  CrO42- and Cr2O72- are not the same.
4.   Cr2+(d4)  is a stronger reducing agent than  Fe2+(d6)  in water. 

Subtopic:  d-Block Elements- Properties & Uses |
 76%
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Urea reacts with water to form A which will decompose to form B. B when passed through \(\left(Cu\right)^{2 +}\) (aq), deep blue color solution C is formed. What is the formula of C from the following?

1. \(\left[Cu \left(NH_{3}\right)_{4}\right]^{2 +}\) 2. \(Cu \left(\right. OH \left.\right)_{2}\)
3. \(CuCO_{3} . Cu (OH)_{2}\) 4. \(CuSO_{4}\)
Subtopic:  d-Block Elements- Properties & Uses |
 71%
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Identify the incorrect statement from the following:

1.  Zirconium and Hafnium have identical radii of 160 pm and 159 pm, respectively as a consequence of lanthanoid contraction.
2.  Lanthanoids reveal only +3 oxidation state.
3.  The lanthanoid ions other than the f0 type and the f14 type are all paramagnetic.
4.  The overall decrease in atomic and ionic radii from lanthanum to lutetium is called lanthanoid contraction.

Subtopic:  Lanthanoid & Actinoids Contraction |
 67%
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Match the following aspects with the respective metal.

  Aspects        Metal
(a) The metal which reveals the maximum number of oxidation states (i) Scandium
(b) The metal although placed in a 3d block is not considered as a transition element (ii)  Copper
(c) The metal which does not exhibit variable oxidation states (iii)  Manganese
(d) The metal which in +1 oxidation state in aqueous solution undergoes disproportionation (iv)   Zinc


Select the correct option:

Options: (a) (b) (c) (d)
1. (i) (iv) (ii) (iii)
2. (iii) (iv) (i) (ii)
3. (iii) (i) (iv) (ii)
4. (ii) (iv) (i) (iii)

Subtopic:  d-Block Elements- Properties & Uses |
 83%
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When neutral or faintly alkaline KMnO4 is treated with potassium iodide, iodide ion is converted into 'X'. 'X' is:

1. I2

2. IO4-

3. IO3-

4. IO-

Subtopic:  Chemistry of Mn and Cr Compounds |
 75%
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NEET - 2019
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Match the catalyst with the process:

Catalyst Process
(i) \(V_2O_5\) (a) The oxidation of ethylene to ethanal
(ii) \(TiCl_4 + Al(CH_3)_3\) (b) Polymerisation of alkynes
(iii) \(PdCl_2\) (c) Oxidation of \(SO_2\) in the manufacture of  \(H_2SO_4\)
(iv) Nickel complexes  (d) Polymerisation of ethylene

Which of the following is the correct matching of Catalyst & Process?

Options: (i) (ii) (iii) (iv)
1. c d a b
2. a b c d
3. a c b d
4. c a d b


1. (i)-(c), (ii)-(d), (iii)-(a), (iv)-(b)

2. (i)-(a), (ii)-(b), (iii)-(c), (iv)-(d)

3. (i)-(a), (ii)-(n), (iii)-(b), (iv)-(d)

4. (i)-(c), (ii)-(a), (iii)-(d), (iv)-(b)

Subtopic:  d-Block Elements- Properties & Uses |
 74%
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Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of: 

1. Lanthanoid contraction

2. Having similar chemical properties

3. Belonging to the same group

4. Diagonal relationship

Subtopic:  d-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |
 87%
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The incorrect statement among the following is:

1. Lanthanoids are good conductors of heat and electricity.
2. Actinoids are highly reactive metals, especially when finely divided.
3. Actinoid contraction is greater for element to element than Lanthanoid contraction.
4. Most of the trivalent Lanthanoid ions are colorless in the solid-state.
Subtopic:  d-Block Elements- Properties & Uses |
 56%
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The manganate and permanganate ions are tetrahedral, due to:

1. The π-bonding involves the overlap of d-orbitals of oxygen with d-orbitals of manganese.
2. The π-bonding involves the overlap of p-orbitals of oxygen with d-orbitals of manganese.
3. Absence of π-bonding.
4. The π-bonding involves the overlap of p-orbitals of oxygen with p-orbitals of manganese.
Subtopic:  Chemistry of Mn and Cr Compounds |
 74%
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