Hydrogen - 1 - JEE MCQ

bond angle of O - O - H in H₂O₂ is 94.8°

In H₂O₂, the O-H groups are not in the same plane. So it has a non-planar structure. It has a half-opened book structure in which the two O—H groups lie on the two pages of the book. The angle between two pages of the book is 94° and H—O—O bond angle is 97°.

Hardness of water, due to the presence of chlorides and sulphates of Ca and Mg, is called permanent hardness. Hence, hard water will consist of Mg²⁺ and Cl⁻ ions.

H₂O₂ is diatomic and forms H⁺ + HO₂⁻ (X⁻) (hydroperoxide ion).

Copper is a noble metal, as it lies below hydrogen in the electrochemical series. Therefore, it can’t displace hydrogen from dilute HCl. While iron and sodium lie above hydrogen in the electrochemical series, so they can liberate H₂ either from steam or H₂SO₄ solution.

C₂H₅—OH + Na → C₂H₅—ONa + 1/2 H₂
Fe + H₂SO₄ → FeSO₄ + H₂
3Fe + 4H₂O → Fe₃O₄ + 4H₂

Mg reacts with nitric acid to give Mg(NO₃)₂ and evolves H₂.

It is an example of an oxidation reaction.

Heavy water is used for slowing down the speed of neutrons in nuclear reactors, hence used as a moderator. Boiling point of heavy water is greater (374.42 K) than that of ordinary water (373 K), hence heavy water is more associated. Dielectric constant of ordinary water is greater than that of heavy water, hence ordinary water is a better solvent.

Normality (N) = 1.5

We know that the equivalent weight of H₂O₂ is 17, and
Strength of H₂O₂ = Normality × Equivalent weight
= 1.5 x 17 = 25.5

The reaction is:

(2 × 34 = 68 g) produces 22.4 litres of oxygen at NTP.
Since 68 g of H₂O₂ produces 22.4 litres of oxygen at NTP,
25.5 g of H₂O₂ will produce:

Thus, the volume strength of the given H₂O₂ solution is 8.4.

Proton (H⁺) ion, being very small in size, would have very large hydration energy.

Hardness of water, due to the presence of chlorides and sulphates of Ca and Mg, is called permanent hardness. Hence, hard water will consist of Mg²⁺ and Cl⁻ ions.

(c): It gives rise to a proton.

In H₂O₂, the O-H groups are not in the same plane. So it has a non-planar structure. It has a half-opened book structure in which the two O—H groups lie on the two pages of the book. The angle between two pages of the book is 94°, and the H—O—O bond angle is 97°.

H₂O₂ is diatomic and forms H⁺ + HO₂⁻ (X⁻) (hydroperoxide ion).

It is an example of an oxidation reaction.

H₂O₂ behaves as a bleaching agent because it breaks the chemical bonds of the chromophores

Stoichiometric compounds of hydrogen are formed with s-block elements. Only Group I elements form stoichiometric hydrides with Hydrogen as same as halides.

H₂O₂ is an oxidizing agent in 1st reaction and Reducing agent in 2nd reaction.

In crystal structure of Copper sulphate pentahydrate there only 4 water molecule of hydration and one water molecule is associated with hydrogen bonding interaction.

Volume strength = 11.2 x M So M = 5/11.2 = 0.446 Strength (g/L ) = 0.446 x 34 = 15.17 g/L