In acidic medium, H2O2 changes Cr2O72- to CrO5 which has two (-O-O-) bonds. Oxidation state of Cr in CrO5 is

(a) +5

(b) +3

(c) +6

(d) -10

Concept Questions :-

H2O2 (Hydrogen Peroxide)
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The reaction of aqueous KMnO4 with H2O2 in acidic conditions gives

(a) Mn4+ and O2                                     (b) Mn2+ and O2

(c) Mn2+ and O3                                     (d) Mn4+ and MnO2

Concept Questions :-

H2O2 (Hydrogen Peroxide)
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


(I) H2O2+O3           H2O + 2O2

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

Role of hydrogen peroxide in the above reactions is respectively

(a) oxidising in (I) and reducing in (II)

(b) reducing in (I) and oxidising in (II)

(c) reducing in(I) and  (II)

(d) oxidising in(I) and (II)

Concept Questions :-

H2O2 (Hydrogen Peroxide)
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 statements about hydrogen is incorrect?

(a) Hydrogen never acts as cation in Ionic salts

(b) Hydronium ion ,H3O+ exists freely in solution

(c) Dihydrogen does not act as a reducing agent

(d) Hydrogen has three isotopes of which Protium is the most common

Concept Questions :-

Di-Hydrogen,type and isotopes
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


H2O2 restores the colour of old lead paintings, blackened by the action of H2S gas, by:

(1) converting PbO2 to Pb

(2) oxidising PbS to PbSO4

(3) converting PbCO3 to Pb

(4) oxidizing PbSO3 to PbSO4

Concept Questions :-

H2O2 (Hydrogen Peroxide)
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Which conversion is not done by H2O2 ?

(1) Fe2+         Fe3+(acidic medium)

(2) PbS         PbSO4

(3) Fe1+         Fe3+ (alkaline medium)

(4) KI         I2

Concept Questions :-

H2O2 (Hydrogen Peroxide)
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Poorest reducing agent among following is

1. atomic hydrogen

2. nascent hydrogen

3. dihydrogen

4. all have same reducing strength

Concept Questions :-

Di-Hydrogen,type and isotopes
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Which salt does not cause hardness of water ?

(1) Mg(HCO3)2

(2) CaCl2

(3) MgSO4

(4) MgCO3

Concept Questions :-

Hard & Soft Water
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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

Concept Questions :-

Preparation & Properties
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Nascent hydrogen consists of -

(A) Hydrogen atoms with excess energy

(B) Hydrogen molecules with excess energy

(C) Hydrogen ions in the excited state

(D) Solvated protons

Concept Questions :-

Di-Hydrogen,type and isotopes
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level: