2nd Year Chemistry Past Papers

Here are the detailed 2nd Year Chemistry Past Papers to help you prepare for your exams.

1-1. The anhydride of HClO4 is:

(A) ClO3

(B) ClO2

(C) Cl205

(D) Cl207

During nitration of benzene, the active nitrating agent is:

(A) NO3

(B) NO2

(C) NO₂

(D) HNO3

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3. Which one of these polymers is a synthetic polymer:

(A) Animal fat

(B) Starch

(C) Cellulose

(D) Polyester

4.The main pollutant of leather tanneries in the waste water is due to the salts of:

(A) Lead

(B) Chromium (VI)

(C) Copper

(D) Chromium (III)

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5. Keeping in view the size of atoms, which order is the correct one:

(A) Mg>Sr

(B) Ba > Mg

(C) Lu> Ce

(D) Cl>1

6. Formalin is:

(A) 10% solution of formaldehyde in water

(B) 20% solution of formaldehyde in water

(C) 40% solution of formaldehyde in water

(D) 60% solution of formaldehyde in water

7. Tincal is a mineral of:

(A) Al

(B) B

(C) Si

(D) C

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8. Which enzyme is not involved in fermentation of starch:

(A) Diastase

(B) Zymase

(C) Urease

(D) Maltase

9. Peroxyacetylnitrate (PAN) is an irritant to human beings and it affects:

(A) Eyes

(B) Ears

(C) Stomach

(D) Nose

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10. Which set of hybrid orbitals has planer triangular shape:

(A) dSp²

(B) Sp³

(C) Sp²

(D) Sp

11. Which one of the following is not an alkali metal:

(A) Fr

(B) Cs

(C) Rb

(D) Ra

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12. Preparation of vegetable ghee involves:

(A) Halogenation

(B) Hydrogenation

(C) Hydroxylation

(D) Dehydrogenation

13. Co-ordination number of pt in [pt Cl (NO2) (NH3)4] is:

(A) 2

(B) 4

(C) 1

(D) 6

14. For which mechanism, the first step involved is the same:

(A) E and E2

(B) E2 and SN2

(C) SN1 and E2

(D) E and SN1

17. Which catalyst is used in contact process for preparing H2SO4:

(A) Fe2O3

(B) V2O5

(C) SO3

(D) Ag2O

16. Which of the following is not a fatty acid:

(A) Propanoic acid

(B) Acetic acid

(C) Phthalic acid

(D) Butanoic acid

17. Micro-nutrients are required in quantity ranging from:

(A) 4-40 g

(B) 6-200 g

(C) 6-200 kg

(D) 4-40 kg

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2. Write short answers to any EIGHT (8) questions:

(i) Why diamond is a non-conductor and graphite is fairly a good conductor?

(ii) The hydration energy of the ions are in the order, justify it: A+ > Mg+2 > Na

(iii) Why lime water turns milky with CO₂ but becomes clear with excess of CO₂.

(iv) Give any four uses of " Al".

(v) What happens when ortho boric acid reacts with:  (i) NaOH   (ii) Ethyl alcohol

(vi) What is vitreous silica, give its two uses?

(vii) NO₂ is a strong oxidizing agent, prove with the help of two reactions.

(viii) Give two reactions of H₂SO₄ which show its oxidizing behaviour.

(ix) Give four dissimilarities of oxygen and sulphur.

(x) What is BOD?

(xi) What is the role of chlorofluorocarbons in destroying ozone?

(xii) Explain cis-trans isomerism, give one example.

3. Write short answers to any EIGHT (8) questions:

(i) Define ligand with an example.

(ii) What is the percentage (%) of carbon in different types of steel?

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(iii) Why alkanes are less reactive organic compounds?

(iv) Convert: (a) Acetylene → Benzene

(b) Vinyl acetylene Chloroprene

(v) What is meant by nitration of benzene? Write its reaction.

(vi) What do you mean by leaving group? Give an example.

(vii) What is denaturing of alcohol?

(viii) How Lucas test is used to distinguish between primary, secondary and tertiary alcohol?

(ix) Write any four uses of acetaldehyde.

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(x) How iodoform test can be used to distinguish methyl ketones from other ketones?

(xi) What is the difference between essential and non-essential amino acids?

(xii) How acetic acid reacts with: (a) PCl3  (b) SOCl2

4. Write short answers to any SIX (6) questions:

(i) What is denaturation of proteins?

(ii) What are thermosetting polymers?

(iii) What is acid number?

(iv) What is clinker formation?

(v) Name two woody and two non-woody raw materials.

(vi) Give significance of potash fertilizer.