Which of the following species has the highest number of unpaired electrons?

1. Fe2+

2. Fe3+

3. Co3+

4. Co2+

Subtopic:  d-Block Elements- Properties & Uses |
 81%
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The atomc number of potassium is 19 & that of manganese is 25. Although the colour of MnO4- is dark violet yet the K+ is colourless.This is due to the fact that

(1) Mn is a transition element; while K+ is not

(2) [MnO4]- is negatively charged; while K+ has a positive charge.

(3) The effective atomic number of Mn in [MnO4]- is 26; while for K+ , the atomic number s 18

(4) The Mn in a high positive oxidation state allow charge transfer transitions.

Subtopic:  Chemistry of Mn and Cr Compounds |
 60%
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Heating of Ag with dil. HNO3 give

1. NO

2. NO2

3. N2O

4. N2O3

Subtopic:  d-Block Elements- Properties & Uses |
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Zinc dissolve in an excess of NaOH because of the formation of:

1. ZnO

2. Zn(OH)2

3. NaZn(OH)3

4. Na2ZnO2

Subtopic:  d-Block Elements- Properties & Uses |
 57%
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When excess of SnCl2 is added to HgCl2, the substance formed is

1. Hg2Cl2

2. Sn

3. Hg

4. Cl2

Subtopic:  d-Block Elements- Properties & Uses |
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The oxidation number is changed in which of the following case

1. SO2 gas is passed into Cr2O72-/H+

2. Aqueous solution of CrO42- is acidified

3. CrO2Cl2 is dissolved in NaOH

4. Cr2O72- solution is made alkaline

Subtopic:  Chemistry of Mn and Cr Compounds |
 56%
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Which of the following elements form stable dinuclear ions

1. Zn

2. Cd

3. Hg

4. Fe

Subtopic:  d-Block Elements- Properties & Uses |
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The correct electronic configuration of Ti(Z=22 atom) is

(1) 1s22s22p63s23p63d2

(2) 1s22s22p63s23p63d24p6

(3) 1s22s22p63s23p63d4

(4) 1s22s22p63s23p64s23d2

Subtopic:  d-Block Elements- Properties & Uses |
 86%
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The correct statement regarding colour of Zn2+, Ni2+and Cr3+among the following is:

1. Only Zn2+ is Colourless and  Ni2+and Cr3+ are coloured
2. All these are colourless
3. All these are coloured
4. Only Ni2+ is coloured and Zn2+ and Cr3+ are colourless.
Subtopic:  d-Block Elements- Properties & Uses |
 85%
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The incorrect statement regarding the transition metals is:

1. They are malleable and ductile.
2. They have high melting and boiling points.
3. They crystallise with body-centered cubic and hexagonal close-packed structure only.
4. They show variable oxidation states although not always. 
Subtopic:  d-Block Elements- Properties & Uses |
 67%
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