H₂ is used as reducing agent to convert vegetable oil into vegetable ghee.

H₂O₂ (l) \(\longrightarrow\) H₂O (l) + O(g)
Nascent oxygen produced is responsible for bleaching action.

NaH is an ionic hydride and B₂H₆ is a covalent hydride.

Mixture of CO and H₂ in the ratio of 1: 1 is called water gas.
It is prepared by passing steam over red hot coke.
C(s) + H₂O(g) \(\overset { 1270K }{ \longrightarrow } \) CO(g) + H₂(g)

Autoprotolysis means self-ionisation of water. It may be represented as
\(\underset { (oxidant) }{ { 2F }_{ 2 }(g) } +\underset { (Reductant) }{ { { 2H }_{ 2 }O } } \longrightarrow { O }_{ 2 }(g)+{ 4H }^{ + }(aq)+{ 4F }^{ - }(aq)\)
Due to auto-protalysis water is amphoteric in nature. i.e., it can act as an acid as well as base.

Protium - \(^1_1H\)
Deuterium - \(^2_1H\) or D
Tritium - \(^3_1H\) or T
Mass ratio of Protium: Deuterium: Tritium
= 1: 2: 3

Hydrogen has been placed at the top of the alkali metal in group, but it is not a member of the group.
Its position is not justified properly because of its electronic configuration as (1S¹). It can be placed with alkali metals because it also has similar configuration (ns¹) as alkali metals.
However, it can also be placed along with halogen in group 17 since just like halogen it can acquire inert gas configuration by accepting one electron.

No, because heavy water is injurious to human beings as rate of biochemical reactions decreases in heavy water.

High dipole moment and high dielectric constant, these are the two properties of water which make it useful as a solvent It can dissolve both ionic compounds as well as those covalent compounds which can form hydrogen bonds with water such as ethyl alchol, sugar, glucose etc.

Since, electronegitivity of F is the highest, therfore, magnitude of the possitive charge on hydrogen and negative charge on F is the highest in HF and hence, electrostatic attraction of the H-bonding is the strongest in H-F.

In metallic hydrides, hydrogen is absorbed as H-atoms. This property of adsorption of hydrgen on transition metals is widely used as its storage media. Some of the metals such as Pd, Pt can accommodate a very large volume of hydrogen storgae and as a source of energy. Metalic hydrides on heating decompose to form hydrogen and very finely divided metal.

No, the boling points of hydrides of N, O and Fare higher than the hydrides of their subsequent group members. On the basis of molecular masses of NH₃, H₂O and HF, their boling point are expected to be lower than those of the subsequent group member hydrides. But because of their high electronegativity they aggregates together through hydrogen bonding and thus, have high boiling point.

Diprotium Diprotium is the term used to represent \(^{ 1 }{ H }_{ 2 }\)

10 volume solution of \({ H }_{ 2 }{ O }_{ 2 }\)means that 1L of this \({ H }_{ 2 }{ O }_{ 2 }\)solution will give 10L of oxygen at STP.
\(\underset { 68 \ g }{ { 2H }_{ 2 }{ O }_{ 2 }(l) } \rightarrow \underset { 22.7L \ at \ STP }{ { O }_{ 2 }(g) } +{ H }_{ 2 }O(l)\)
Thus 22.7 L\({ O }_{ 2 }\)is obtained from 68g \({ H }_{ 2 }{ O }_{ 2 }\) at STP
\(\therefore \)10 L of \({ O }_{ 2 }\)at STP is produced from
\(\cfrac { 68 \times10 }{ 22.7 } g=29.9g\approx 30g{ H }_{ 2 }O_{ 2 }\)
Thus, the strength of \({ H }_{ 2 }O_{ 2 }\)in 10 volume \({ H }_{ 2 }O_{ 2 }\)solution = 30g/L = 3% \({ H }_{ 2 }O_{ 2 }\) solution.

\({ H }_{ 2 }{ O }_{ 2 }\) is a better oxidising agent than water as discussed below.
(a) \({ H }_{ 2 }{ O }_{ 2 }\) oxidises an acidified solution of KI to give \({ I}_{ 2 }\) which gives blue colour with starch solution but \({ H }_{ 2 }{ O }\) does not.
(b) \({ H }_{ 2 }{ O }_{ 2 }\)turns black PbS to white PbSO\(_{ 4 }\)but \({ H }_{ 2 }{ O}\) does not.