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 |
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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 |
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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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NEET - 2019
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Actinoids exhibit more oxidation states than lanthanoids. The main reason for this is:

1. More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
2. Greater metallic character of the lanthanoids than that of the corresponding actinoids
3. The lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
4. More active nature of the actinoids

Subtopic:  f-Block Elements- Properties & Uses |
 62%
From NCERT
AIPMT - 2006
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The d-electron configurations of Cr2+, Mn2+, Fe2+ and Ni2+ and 3d4, 3d5, 3d6 and 3d8 respectively.
Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour? 
(At. No. Cr = 24, Mn = 25, Fe = 26, Ni = 28)

1. \(\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\)
2. \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\)
3. \(\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\)
4. \(\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\)

Subtopic:  d-Block Elements- Properties & Uses |
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AIPMT - 2007
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Which one of the following ions is the most stable in an aqueous solution? 
(At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)

1. Cr3+

2. V3+

3. Ti3+

4. Mn3+

Subtopic:  d-Block Elements- Properties & Uses |
From NCERT
AIPMT - 2007
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Identify the incorrect statement among the following:

1. There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
2. Lanthanoid contraction is the accumulation of successive shrinkages
3. As a result of lanthanoid contraction, the properties of the 4d series of the transition elements have no similarities with the 5d series of elements
4. The shielding power of 4f electrons is quite weak.

Subtopic:  Lanthanoid & Actinoids Contraction |
 84%
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AIPMT - 2007
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Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?

1. 3d3, 4s2

2. 3d5, 4s1

3. 3d5, 4s2

4. 3d2, 4s2

Subtopic:  d-Block Elements- Properties & Uses |
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AIPMT - 2009
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Which of the following pairs has the same size?

1. Fe2+, Ni2+

2. Zr4+, Ti4+

3. Zr4+, Hf4+

4. Zn2+, Hf4+

Subtopic:  d-Block Elements- Properties & Uses |
 88%
From NCERT
AIPMT - 2010
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Which one of the following ions has electronic configuration [Ar] 3d6
(At. no :Mn = 25, Fe= 26, Co= 27, Ni = 28)

1. Ni3+

2. Mn3+

3. Fe3+

4. Co3+

Subtopic:  d-Block Elements- Properties & Uses |
 80%
From NCERT
AIPMT - 2010
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