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 |
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints

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 |
 70%
From NCERT
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh

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 |
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints

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 |
 52%
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints

Fe is made passive by :

1. dil . H2SO4

2. dil. HCl

3. Conc. HNO3

4. Conc. H2SO4

Subtopic:  d-Block Elements- Properties & Uses |
 55%
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints

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 |
From NCERT
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Elements that generally exhibit multiple oxidation states and whose ions in an aqueous medium are usually colored:

1. Metalloids

2. Transition elements

3. Non-metals

4. Noble gas

Subtopic:  Lanthanoid & Actinoids Contraction |
 94%
From NCERT
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh

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%
From NCERT
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh

Which has the highest melting point?

1. Cr

2. Fe

3. Cu

4. Mo

Subtopic:  d-Block Elements- Properties & Uses |
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh

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 |
 51%
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints