In which reaction hydrogen is not formed ?

(1) Copper and hydrochloric acid

(2) Iron and sulphuric acid

(3) Magnesium and steam

(4) Sodium and alcohol

Subtopic:  Preparation & Properties |
 70%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Poorest reducing agent among following is

1. atomic hydrogen

2. nascent hydrogen

3. dihydrogen

4. all have same reducing strength

Subtopic:  Hydrogen- Types & Isotopes |
 51%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Which conversion is not done by H2O2 ?

1. Fe2+         Fe3+(acidic medium)

2. PbS         PbSO4

3. Fe+         Fe3+ (alkaline medium)

4. KI         I2

Subtopic:  H2O2 (Hydrogen Peroxide) |
 60%
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

H2O2 restores the colour of old lead paintings by:

1. Converting PbO2 to Pb

2. Oxidising PbS to PbSO4

3. Converting PbCO3 to Pb

4. Oxidizing PbSO3 to PbSO4

Subtopic:  H2O2 (Hydrogen Peroxide) |
 74%
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 correct statement for the hydrogenation of oil is:

1. Hydrogen is dissolved in the oil
2. Hydrogen combines with O2 from the oil
3. Esters of unsaturated fatty acids are reduced to those of saturated acids
4. Hydrogen drives off impurities from the oil

Subtopic:  Hydrogen- Types & Isotopes |
 88%
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

(I) H2O2+O3           H2O + 2O2

(II) H2O2 + Ag2O           2Ag + H2O + O2

Role of hydrogen peroxide in the above reactions is respectively

1. oxidising in (I) and reducing in (II)

2. reducing in (I) and oxidising in (II)

3. reducing in (I) and  (II)

4. oxidising in(I) and (II)

Subtopic:  H2O2 (Hydrogen Peroxide) |
From NCERT
NEET - 2014
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

In acidic medium, H2O2 changes Cr2O72- to CrO5 which has two (-O-O-) bonds. Oxidation

state of Cr in CrO5 is

1. +5

2. +3

3. +6

4. -10

Subtopic:  Hydrogen- Types & Isotopes | H2O2 (Hydrogen Peroxide) |
 64%
NEET - 2014
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

 Hardness of water cannot be removed by -

1. Clark's method

2. Adding washing soda

3. Calgon process

4. Filtration

Subtopic:  Hard & Soft Water |
 85%
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 decomposition of H2O2 is accelerated by:

1. traces of acids

2. finely divided metals

3. acetanilide

4. alcohol

Subtopic:  H2O2 (Hydrogen Peroxide) |
 67%
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 given solution of H2O2 is 30 volume. Its concentration in terms of molarity is:

1. 9.1 M

2. 2.68 M

3. 2.5 M

4. 26.8 M

Subtopic:  H2O2 (Hydrogen Peroxide) |
 65%
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