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

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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

Concept Questions :-

Chemistry of KMnO4, K2Cr2O7 & CrO5 and others
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Fe is made passive by :

(a) dil . H2SO4

(b) dil. HCl

(c) Conc. HNO3

(d) Conc. H2SO4

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The iron salt used in blue prints is:

(a) FeC2O4

(b) Fe2(C2O4)3

(c) K4Fe(CN)6

(d) FeSO4

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Which has highest melting point?

1. Cr

2. Fe

3. Cu

4. Mo

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The colour of KMnO4 is due to

1. d-d transition

2. Charge transfer spectra

3. Polarisation of ion

4. p-d transition

Concept Questions :-

Chemistry of KMnO4, K2Cr2O7 & CrO5 and others
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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

1. Fe

2. Mn

3. Cu

4. Zn

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


With F highest stable oxidation state of Mn is

1. +6

2. +4

3. +7

4. +3

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level: