Chemistry

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: option (i)

 As, H-A bond strength is a more important factor in determining acidity than its polar nature. As the size of A increases down the group, H-A bond strength decreases.

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i) →c; (ii) → (d); (iii) → (a).

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i) → (c); (ii) → (a); (iii) → (b).

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i) → (b); (ii) → (e); (iii) → (c); (iv) → (d)

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i) → (d); (ii) → (a); (iii) → (b).

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i) → (d); (ii) → (c); (iii) → (b)

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

Hydrogen has electronic configuration 1s¹. On the one hand, its electronic configuration is similar to that of alkali metals in the first group of the periodic table, which have an outer electronic configuration (ns¹). As a result, hydrogen resembles alkali metals that lose one electron to become unipositive ions.

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

(i) The given compound is H₂O₂.

(ii) Textiles, paper pulp, leather, oils, fats, and other products use it as a bleaching agent. In both acidic and alkaline media, it works as an oxidising and reducing agent. It is therefore kept in dark wax-lined glass or plastic containers. As a stabiliser, urea might be used. It is kept away from dust since dust can cause the compound to decompose explosively.

This is a Matching Type Questions as classified in NCERT Exemplar

Ans: (i) → (b); (ii) → (d); (iii) → (c); (iv) → (a).

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: options (i) and (iv)

Ice and water are in equilibrium only at particular temperature and pressure. For any pure substance at atmospheric pressure, the temperature at which the solid and liquid phases are at equilibrium is called the normal melting point or normal freezing point of the substance. For example, it is 4°C in case of water. The system here is in dynamic equilibrium.