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. Hence, x and y are:

1. 6,8

2. 6,5

3. 8,6

4. 7,7

Subtopic:  Chemistry of Mn and Cr Compounds |
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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 |
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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 has highest melting point?

1. Cr

2. Fe

3. Cu

4. Mo

Subtopic:  d-Block Elements- Properties & Uses |
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The colour of KMnO4 is due to

1. d-d transition

2. Charge transfer spectra

3. Polarisation of ion

4. p-d transition

Subtopic:  Chemistry of Mn and Cr Compounds |
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Which of the following element does not show the variable oxidation state?

1. Fe

2. Mn

3. Cu

4. Zn

Subtopic:  d-Block Elements- Properties & Uses |
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With F highest stable oxidation state of Mn is

1. +6

2. +4

3. +7

4. +3

Subtopic:  d-Block Elements- Properties & Uses |
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