The low melting point of manganese in the 1st transition series is due to:

1. strong metallic bond due to d10 configuration

2. weak metallic bond due to d5 configuration

3. weak metallic bond due to d7 configuration

4. none of the above

Subtopic:  d-Block Elements- Properties & Uses |
 71%
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Lanthanoid contraction is caused due to :

1. the appreciable shielding on outer electrons by 4f electrons from the nuclear charge

2. the appreciable shielding on outer electrons by 5d electrons from the nuclear charge

3. the same effective nuclear charge from Ce to Lu

4. the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

Subtopic:  Lanthanoid & Actinoids Contraction |
 66%
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Elements that generally exhibit multiple oxidation states and whose ions in an aqueous medium are usually colored are:

1. Metalloids

2. Transition elements

3. Non-metals

4. Noble gases

Subtopic:  Lanthanoid & Actinoids Contraction |
 94%
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CuSO4 (aq.)H2SMof KCNExcessN+O

Then final products N and O are respectively.

1. [Cu(CN)4]3-,(CN)2

2. CuCn,(CN)2

3. [Cu(CN)4]2-,(CN)2

4. Cu(CN)2,K2S

Subtopic:  d-Block Elements- Properties & Uses |
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CrO42- (yellow) changes to Cr2O72- (orange) in pH = x and vice versa in pH = y.

The value of x and y will be:

1. 6, and 8

2. 6, and 5

3. 8, and 6

4. 7, and 7

Subtopic:  Chemistry of Mn and Cr Compounds |
 68%
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When steam is passed over red hot iron , the substances formed are:

1. Fe2O3 +H2

2. Fe3O4 +H2

3. FeO +H2

4. FeO+ H2 +O2

Subtopic:  d-Block Elements- Properties & Uses |
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Which of the following solid salt on heating with K2Cr2O7 and Conc. H2SO4 orange,red vapours are evolved which turn aquous NaOH solution yellow?

1. NaBr

2. NaCl

3. NaNO3

4. NaI

Subtopic:  d-Block Elements- Properties & Uses |
 51%
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Fe is made passive by :

1. dil . H2SO4

2. dil. HCl

3. Conc. HNO3

4. Conc. H2SO4

Subtopic:  d-Block Elements- Properties & Uses |
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The iron salt used in blue prints is:

1. FeC2O4

2. Fe2(C2O4)3

3. K4Fe(CN)6

4. FeSO4

Subtopic:  d-Block Elements- Properties & Uses |
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Which element among the following has the highest melting point?

1. Cr

2. Fe

3. Cu

4. Mo

Subtopic:  d-Block Elements- Properties & Uses |
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