An element that does not show variable oxidation state is:

1. Fe 2. Mn
3. Cu 4. Zn

Subtopic:  d-Block Elements- Properties & Uses |
 90%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A pair among the following that has both coloured ions in the aqueous solution is-
(At. no : Sc =21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

1. Ni2+, Ti3+ 2. Sc3+, Ti3+
3. Sc3+, Co2+ 4. Ni2+, Cu+
Subtopic:  d-Block Elements- Properties & Uses |
 78%
From NCERT
NEET - 2006
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

 The increasing order of oxidising power among the following species is :

1. VO2+Cr2O72MnO4-                           

2. VO2MnO4Cr2O72-

3. Cr2O72VO2MnO4-,                           

4. Cr2O72MnO4VO2+

Subtopic:  d-Block Elements- Properties & Uses |
 76%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The values of X, Y, P, and Q are, respectively:
   

1. MnO3+, Mn2O7, conc. H2SO4, and K2MnO4

2. K2MnO4, conc. H2SO4, Mn2O7, and MnO3+

3. Na2CO3, MnO2, K2MnO4, and Mn2O7

4. H+, K2MnO4MnO3+, and Mn2O7

Subtopic:  d-Block Elements- Properties & Uses |
 73%
Please attempt this question first.
Hints

Which of the following statements is false? 

1. V2+ < Cr2+ < Mn2+ < Fe2+ : Paramagnetic behaviour
2. Ni2+ < Co2+ < Fe2+ < Mn2+ : Ionic size
3. Co3+ < Fe3+ < Cr3+ < Sc3+ : Stability in aqueous solution
4. Sc < Ti < Cr < Mn : Number of oxidation states

Subtopic:  d-Block Elements- Properties & Uses |
 66%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The incorrect statement among the following is:  

1. There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
2. Lanthanoid contraction is the accumulation of successive shrinkages.
3. As a result of lanthanoid contraction, the properties of the 4d series of the transition elements have no similarities with the 5d series of elements.
4. The shielding power of 4f electrons is quite weak.

Subtopic:  Lanthanoid & Actinoids Contraction |
 85%
From NCERT
AIPMT - 2007
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Iron does not get oxidised in:

1. Rusting of iron sheets
2. Decolourisation of blue CuSO4 solution by iron
3. Formation of Fe(CO)from Fe
4. Liberation of H2 from steam by iron at a high temperature
Subtopic:  d-Block Elements- Properties & Uses |
 70%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Which one of the following is a diamagnetic ion?

1. La3+  2. Lu3+
3. Ce4+  4. All of the above.
Subtopic:  f-Block Elements- Properties & Uses |
 87%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution will be:

1. +2

2. +3

3. +4

4. +6

Subtopic:  Chemistry of Mn and Cr Compounds |
 64%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The lanthanide contraction is responsible for the fact that:

1. Zr and Y have about the same radius .

2. Zr and Zn have the same oxidation state.  

3. Zr and Hf have about the same atomic radius .

4. Zr and Nb have a similar oxidation state.

Subtopic:  Lanthanoid & Actinoids Contraction |
 93%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh