NEET Practice Questions - Chemistry - The d and f Block Elements

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    The d and f Block Elements

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

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

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

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


(c) NaNO3

(d) NaI

Consider the following transformation:

2CuX2room temperature2CuX+X2

Then X- can be :

(a) F-,Br-

(b) Cl-,Br-

(c) CN-

(d) Cl-,F-

Fe is made passive by :

(a) dil . H2SO4

(b) dil. HCL

(c) Conc. HNO3

(d) Conc. H2SO4

The iron salt used in blue prints is:

(a) FeC2O4

(b) Fe2(C2O4)3

(c) K4Fe(CN)6

(d) FeSO4

Which has highest melting point?

1. Cr

2. Fe

3. Cu

4. Mo

The colour of KMnO4 is due to

1. d-d transition

2. Charge transfer spectra

3. Polarisation of ion

4. p-d transition

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

1. Fe

2. Mn

3. Cu

4. Zn