Class 11th

This is a multiple choice answer as classified in NCERT Exemplar

Option (ii)

BaO₂ -8H₂O

Hydrogen peroxide is produced by acidifying barium peroxide and eliminating excess water by evaporation under low pressure.

This is a multiple choice answer as classified in NCERT Exemplar

Option (ii)

An oxidizing agent in (A) and reducing agent in (B)

H₂O₂ acts as an oxidising agent in A as it oxidized iodine from -1 to 0, while in B it acts as reducing agent as it reduced chlorine from +1 to -1

This is a multiple choice answer as classified in NCERT Exemplar

Option (iii)

Tritium

The tritium concentration is about one atom per 10¹⁸ atoms of protium. Of these isotopes, only tritium is radioactive and emits low energy beta particles.

This is a multiple choice answer as classified in NCERT Exemplar

Option (iv)

CH₄

These hydrides have the required number of electrons to write their conventional Lewis structures.

This is a multiple choice answer as classified in NCERT Exemplar

Option (ii)

LiH < NaH < KH < RbH < CsH

In ionic hydride as it is formed by the s-Block element, down the group, electropositive character increases.

This is a multiple choice answer as classified in NCERT Exemplar

option (iv)

Loss of an electron from a hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to its small size it cannot exist free.

Loss of the electron from hydrogen atom results in nucleus size (H⁺) of 1.5 * 10^-3. This is extremely small as compared to normal atomic and ionic sizes of 50 to 200 pm. As a consequence, H⁺ does not exist freely and is always associated with other atoms or molecules.

This is a multiple choice answer as classified in NCERT Exemplar

option (ii)

Its tendency to gain a single electron in its valence shell to attain stable electronic configuration.

Like halogens (with ns²np⁵ configuration belonging to the seventeenth group of the periodic table), it is short by one electron to the corresponding noble gas configuration, helium (ls²).

This is a short answer type question as classified in NCERT Exemplar

H₂O (l)+NH₃ (aq) → OH^- (aq)+NH₄⁺ (aq)

H₂O (l)+H₂S (aq) → H₃O⁺ (aq)+HS^- (aq)

This is a short answer type question as classified in NCERT Exemplar

2F₂ (g)+2H₂O → 4H⁺ (aq)+4F^- (aq)+O₂ (g)

This is a short answer type question as classified in NCERT Exemplar

In water hybridisation of oxygen is sp³. Angle should be109^o (approx.) but due to LP - LP repulsion bond angle reduces to 104.5°.