The number of d-electrons in Fe2+ is not equal to
that of the

1.   p-electrons in Ne

2.   s-electrons in Mg

3.  d-electrons in Co+3

4.   p-electrons in Cl_

Subtopic:  d-Block Elements- Properties & Uses |
 57%
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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%
From NCERT
NEET - 2019
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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 |
 76%
From NCERT
NEET - 2019
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The metal having a different lattice from those of others is

1. Co

2. Fe

3. Ag

4. Ni

Subtopic:  d-Block Elements- Properties & Uses |
From NCERT
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The correct order of E0(M2+/M) values with a negative sign for the four successive elements Cr, Mn, Fe and Co is

1. Mn > Fe > Co > Cr

2. Mn > Cr > Fe > Co

3. Fe > Mn > Cr > Co

4. Co > Fe > Mn > Cr

Subtopic:  d-Block Elements- Properties & Uses |
 58%
From NCERT
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The hardest lanthanide  is

1. La

2. Lu

3. Sm

4. Yb

Subtopic:  Lanthanoid & Actinoids Contraction |
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The unpaired  electron in Eu3+ will be the same in: 

1. Yb2+

2. Ho3+

3. Sm2+

4. Gd3+

Subtopic:  f-Block Elements- Properties & Uses |
 63%
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Primary component of Mischmetal that is commonly utilised in gas lighters is:

1. Cerium 
2. Iron
3. Samarium
4. Lanthanum

Subtopic:  d-Block Elements- Properties & Uses |
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The correct statement is

1. Green vitriol and blue vitriol are isomorphus

2. KMnO4 and K2Cr2O7 are coloured due to d-d transitions

3. Cu2Cl2 and Ag2S are coloured

4. Upon strong heating paramagnetic gases are evolved by CuSO4 and AgNO3

Subtopic:  d-Block Elements- Properties & Uses |
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Which is true about the ionic radius of M2+?

1. Ni2+<Cu2+<Zn2+

2. Ni2+>Cu2+>Zn2+

3. Cu2+<Ni2+<Zn2+

4. Zn2+<Ni2+<Cu2+

Subtopic:  d-Block Elements- Properties & Uses |
 53%
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