Class 11th

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

Ans: option (ii)

The solutions which resist change in pH on dilution or with the addition of small amounts of acid or alkali are called buffer solutions.

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).