NEET Chemistry The d and f Block Elements Questions Solved


CuSO4 (aq.)H2SMof KCNExcessN+O

Then final products N and O are respectively.

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

(b) CuCn,(CN)2

(c) [Cu(CN)4]2-,(CN)2

(d) Cu(CN)2,K2S

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CrO42- (yellow) changes to Cr2O72- (orange) in pH =x and vice versa in pH=y. Hence, x and y are:

(a) 6,8

(b) 6,5

(c) 8,6

(d) 7,7

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When steam is passed over red hot iron , the substances formed are:

(a) Fe2O3 +H2

(b) Fe3O4 +H2

(c) FeO +H2

(d) FeO+ H2 +O2

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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?

(a) NaBr

(b)NaCl

(c) NaNO3

(d) NaI

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Consider the following transformation:

2CuX2room temperature2CuX+X2

Then X- can be :

(a) F-,Br-

(b) Cl-,Br-

(c) CN-

(d) Cl-,F-

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Fe is made passive by :

(a) dil . H2SO4

(b) dil. HCl

(c) Conc. HNO3

(d) Conc. H2SO4

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The iron salt used in blue prints is:

(a) FeC2O4

(b) Fe2(C2O4)3

(c) K4Fe(CN)6

(d) FeSO4

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Which has highest melting point?

1. Cr

2. Fe

3. Cu

4. Mo

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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

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Which of the following element does not show the variable oxidation state?

1. Fe

2. Mn

3. Cu

4. Zn

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