In the aluminothermic process, aluminium acts as:

1. an oxidising agent

2. a flux

3. a reducing agent

4. a solder

Subtopic:  Introduction to Redox and Oxidation Number |
 59%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

Disproportionation reaction(s) among the following is/are represented by -

1. Cl2 + 2OH- ClO- + Cl- + H2O

2. Cu2O(s) + 2H+ Cu2+ + Cu(s) + H2O

3. 2HCuCl2 waterDilution with Cu + Cu2+ + 4 Cl- +  2H+

4. All of the above

Subtopic:  Introduction to Redox and Oxidation Number |
 83%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

In a redox change, the oxidant K2Cr2O7 is always reduced to:

1. Cr5+

2. Cr4+

3. Cr3+

4. Cr2+

Subtopic:  Introduction to Redox and Oxidation Number |
 76%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

The reaction, 

3ClO-(aq)ClO3-(aq) + 2Cl-(aq)

is an example of:

1. oxidation reaction

2. reduction reaction

3. disproportionation reaction

4. decomposition reaction

 

Subtopic:  Introduction to Redox and Oxidation Number |
 87%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Oxidation state of +1 for phosphorus is found in:

1. H3PO3 

2. H3PO4

3. H3PO2

4. H4P2O7

Subtopic:  Oxidizing & Reducing Agents |
 88%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Which of the following reactions does not represent a redox change?

1. CaCO3 CaO + CO2

2. 2H2 + O2 2H2O

3. Na + H2 NaOH + \(\frac{1}{2}\)H2

4. MnCl3  MnCl2 + \(\frac{1}{2}\)Cl2

Subtopic:  Introduction to Redox and Oxidation Number |
 71%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

If H2S is passed through an acidified K2Cr2O7 solution, the colour of the solution:

a. will remain unchanged

b. will change to deep red

c. will change to dark green

d. will change to dark brown 

Subtopic:  Introduction to Redox and Oxidation Number |
 58%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

The oxidation number and covalency of sulphur in the sulphur molecule (S8) are respectively:

1. 0 and 2

2. +6 and 8

3. 0 and 8

4. +6 and 2

Subtopic:  Oxidizing & Reducing Agents |
 55%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

H2S is passed through an acidified solution of copper sulphate and a black precipitate is formed. This is due to:

1. oxidation of Cu2+

2. reduction of Cu2+

3. double decomposition

4. reduction and oxidation

Subtopic:  Oxidizing & Reducing Agents |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

The most common oxidation state of an element is -2. The number of electrons present in its outermost shell is:

1. 2

2. 4

3. 6

4. 8

Subtopic:  Oxidizing & Reducing Agents |
 77%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch