Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Equilibrium

Short Answer Type

211.

Write the conjugate acids for the following Bronsted bases: $NH subscript 2 superscript minus$ , NH₃ and HCOO^–.

397 Views

212.

The species: $straight H subscript 2 straight O comma space space HCO subscript 3 superscript minus comma space space space HSO subscript 4 superscript minus space and space NH subscript 3$ can act both as Bronsted acids and bases. For each case give the corresponding conjugate acid and base.

192 Views

213.

Identify the acids and bases in the following equilibrium reactions:

$straight i right parenthesis space HCl plus space straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon space straight H subscript 3 straight O to the power of plus space plus Cl to the power of minus ii right parenthesis space HNO subscript 3 space plus straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon space straight H subscript 3 straight O to the power of plus space plus NO subscript 3 superscript minus iii right parenthesis space CO subscript 3 superscript 2 minus end superscript space plus straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon space OH to the power of minus space plus HCO subscript 3 superscript minus$

141 Views

214.

Select conjugate acid-base pairs from the following equations?

$straight i right parenthesis space NH subscript 3 space plus straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon space NH subscript 4 superscript plus space plus OH to the power of minus ii right parenthesis space straight H subscript 2 SO subscript 4 space plus straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon space straight H subscript 3 straight O to the power of plus space plus HSO subscript 4 superscript minus iii right parenthesis space straight H subscript 2 PO subscript 4 superscript minus space plus straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon space straight H subscript 3 straight O to the power of plus space plus HPO subscript 4 superscript 2 minus end superscript$

150 Views

215. Describe how water behaves both as an acid or a base.

115 Views

216. Comment on the statement: Strong acid has a weak conjugate base and vice-versa.

150 Views

Long Answer Type

217.

All Arrhenius acids are Bronsted acids while all Arrhenius bases arc not Bronsted bases. Discuss.

727 Views

Short Answer Type

218.

What are the limitations (drawbacks) of Bronsted-Lowry concept of acids and bases?

501 Views

Long Answer Type

219.
Discuss in brief Lewis concept of acids and bases.
Or
Discuss the electronic concept of acids and bases.

According to Lewis concept, an acid is any substance (atom, molecule or ion) which is capable of accepting a pair of electrons from another substance to form a co-ordinate (dative) bond.
A base is any substance (atom, molecule or ion) which is capable of donating a pair of electrons to form a co-ordinate (dative) bond. Hence,

In terms of electronic structure.

(i) an acid must have a vacant orbital into which an electron pair donated by a base can be accommodated e.g. AlCl₃, BF₃
(ii) a base is a substance which has at least one lone pair of electrons e.g