Point out the incorrect statement.

(1) Hardness of water depends upon its soap consuming power

(2) Temporary hardness is due to bicarbonates of calcium and magnesium

(3) Permanent hardness is due to soluble sulphates, chlorides and nitrates of Ca and Mg

(4) Permanent hardness can be removed by boiling water

Subtopic:  H2O2 (Hydrogen Peroxide) |
 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

Metal which does not react with cold water but evolves H2 with steam is:

(a) Na

(b) K

(c) Pt

(d) Fe

Subtopic:  Hydrogen- Types & Isotopes | Water |
 56%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

Permutit is chemically known as:

1. Hydrated sodium aluminium silicate

2. Sodium hexa meta-phosphate

3. Sodium silicate

4. Sodium meta-aluminate

Subtopic:  Hard & Soft Water |
 69%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

Hydrogen is not obtained when zinc reacts with:

(a) cold water

(b) dil. H2SO4

(c) dil HCl

(d) hot 20% NaOH

Subtopic:  Hydrogen- Types & Isotopes | Preparation & Properties |
 72%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

Hydrogen peroxide is now generally prepared on industrial scale by the:

(1) Action of H2SO4 on barium peroxide

(2) Action of H2SO4 on sodium paraoxide

(3) Electrolysis of 50% H2SO4

(4) Burning hydrogen in excess of oxygen

Subtopic:  H2O2 (Hydrogen Peroxide) |
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

Ionic hybrides are formed by:

(1) transition metals

(2) elements of very high electropositivity

(3) elements of very low electropositivity

(4) metalloids

Subtopic:  Type of Hydride |
 85%
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

Very pure hydrogen (99.9%) can be made by which of the following processes ?

(1) Mixing natural hydrocarbons of high molecular weight

(2) Electrolysis of water

(3) Reaction of salt like hydrides with water

(4) Reaction of methane with steam

Subtopic:  Hydrogen- Types & Isotopes |
 73%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

Para hydrogen is-

1. Less stable than ortho hydrogen.

2. More stable than ortho hydrogen.

3. As stable as ortho hydrogen.

4. None of the above.

Subtopic:  Hydrogen- Types & Isotopes |
 55%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links

Hydrogen combines directly with:

(a) Ca

(b) Cu

(c) Zn

(d) Fe

Subtopic:  Preparation & Properties |
 67%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

Acidified solution of chromic acid on treatement with H2O2 yields :

(a) CrO3 + H2O + O2

(b) Cr2O2 + H2O + O2

(c) CrO5 + H2O + K2SO4

(d) H2Cr2O7 + H2O + O2

Subtopic:  H2O2 (Hydrogen Peroxide) |
 54%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints