Haryana Board 12th Class Chemistry (English) Previous Year Question Paper

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Haryana Board 12th Class Chemistry (English) Previous Year Question Paper

Section – A
[ Objective Type Questions ]

1. (i) What is tincture of iodine ?

1. 0.2 to 0.4 ppm aqueous solution of chlorine
2. 2-3% aqueous solution of COOHCH3
3. 2-3% solution of iodine in alcohol-water
4. None of the above

(ii) What is hybridization of Ni in [NiCl₄]^2-?

1. sp³d
2. dsp²
3. sp³d²
4. sp³

(iii) Which of the following organic compounds are formed by Wurtz reaction?

1. Alcohols
2. Hydrocarbons
3. Haloalkanes
4. Haloarenes

(iv) Glycogen is an example of :

1. Polysaccharide
2. Disaccharide
3. Monosaccharide
4. Protein

(v) According to Hardy-Schulze rule, which of the following has highest flocculating power ?

1. Al³⁺
2. Ba²⁺
3. Na⁺
4. None of the Above

Answer the following questions in one or two sentences:

(vi) What type of stoichiometric defect is shown by ZnS ?

(vii) Give structure of monomer unit of Nylon-6.

(viii) What do you mean by Peptide linkage ?

(ix) Define Azeotrope mixture.

(x) Sn(s) | Sn²⁺ || H⁺ | H₂(g)(1bar) | Pt(s)

(xi) Identify the reaction order from the following rate constant: k= 3.5×10^-5L mol^-1s^-1

(xii) Write the reaction of Cl₂ with water.

(xiii) Write IUPAC name of (p)O₂N -C₆H₄ -OCH_3.

(xiv) Draw structure of cyclopropanone oxime.

[ Very Short Answer Type Questions ]

2. the density of some lake water is 1.25 g ml^–1 and contains 92 g of Na⁺ ions per Kg of water, calculate the molality of Na⁺ ions in the lake.

3. If a current of 0.5 ampere flows through a metallic wire for 2 hours, then how many electrons would flow through the wire ?

4. Differentiate between cationic and anionic detergents giving suitable examples.

5. Explain the term copolymerization and give two examples.

6. What do you mean by denaturation of a protein ? How does it affect properties of protein ?

7. It is safe to inject solutions isotonic with bloodplasma intravenously. Explain.

8. While giving labelled diagram of dry cell write reactions taking place at cathode and anode.

9. Why does nitrogen show catenation properties less than phosphorus ?

10. Although amino group is o- and p-directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m-nitroaniline. Give reason.

11. Write a short note on Hofmann’s bromamide reaction.

[ Short Answer Type Questions ]

12. (a) What is meant by Hydroboration-oxidation reaction ? Illustrate it with an example.

(b) Predict the major product of acid catalysed dehydration of 1-methylcyclohexanol.

13. Explain [Co(NH₃)₆]³⁺ is inner orbital complex whereas [Ni(NH₃)₆]2⁺ an outer orbital complex.

14. Define the following with suitable examples : (a) F-centres, (b) Antiferromagnetism.

15. Explain the following in context of solid catalysts : (a) Activity, (b) Selectivity.

16. (a) The rate constants of a reaction at 500 K and 700 K are 0.02 S^–1 and 0.07 S^–1 respectively. Calculate the value of Ea.

(b) Under what condition a bimolecular reaction behaves kinetically first order reaction?

17. Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction ?

18. Although chlorine is an electron withdrawing group, yet it is ortho-para directing in electro-philic aromatic substitution reactions, why ?

[ Long Answer Type Questions ]

19. (a) How will you distinguish between Pentan-2-one and Pentan-3-one with the help of Iodoform test ?

(b) How will you bring about following conversions ?

(i) Benzoic acid to m-Nitrobenzyl alcohol.
(ii) Benzaldehyde to Benzophenone.
(iii) Benzoic acid to Benzamide.

Or

Describe the following : (a) Aldol condensation (b) Decarboxylation

20. (a) Arrange the following in the order of property indicated for each set:

(i) F₂, Cl₂, Br₂, I₂ – Increasing bond dissociation enthalpy.
(ii) HF, HCl, HBr, HI – Decreasing acid strength.
(iii) NH₃, PH₃, AsH₃, SbH₃, BiH₃ –Decreasing base strength.

(b) Write the conditions to maximize the yield of H₂SO₄ by contact process.

Or

(a) Draw the structure of following : (i) XeF₆ (ii) XeOF₄

(b) Describe the Haber process for manufacture of ammonia.

21. (a) Why are Mn²⁺ compounds more stable than Fe²⁺ towards oxidation to their +3 state.

(b) What are interstitial compounds ? Why are such compounds well-known for transition metals ?

(c) Write electronic configuration of Pm^3+.

OR

(a)  Define ionic equations for the reaction of acidified potassium permanganate with following :

(i) Oxalic acid,
(ii) H₂S,
(iii) Sulphite ion.

(b) Describe the reactivity of actinoids