CHEMISTRY (Theory)

General Instructions :
(i) All questions are compulsory.
(ii) Questions number 1 to 5 are very short answer questions and carry 1 mark each.
(iii) Questions number 6 to 10 are short answer questions and carry 2 marks each.
(iv) Questions number 11 to 22 are also short answer questions and carry 3 marks each.
(v) Question number 23 is a value based question and carries 4 marks.
(vi) Questions number 24 to 26 are long answer questions and carry 5 marks each.
(vii) Use log tables, if necessary. Use of calculators is not allowed.

Q1.Write the coordination isomer of [Cu(NH3)4][PtCl4].

Q2.Predict the major product formed when sodium ethoxide reacts with tert.Butyl chloride.

Q3.For the reaction A For the reaction A – B, the rate of reaction becomes three times when the concentration of A is increased by nine times. What is the order of reaction ? B, the rate of reaction becomes three times when the concentration of A is increased by nine times. What is the order of reaction ?

Q4.Why is adsorption always exothermic ?

Q5.An aromatic organic compound ‘A’ with molecular formula C8H8O gives positive DNP and iodoform tests. It neither reduces Tollens’ reagent nor does it decolourise bromine water. Write the structure of ‘A’.

Q6.Identify the following :
(i) Transition metal of 3d series that exhibits the maximum number of oxidation states.
(ii) An alloy consisting of approximately 95% lanthanoid metal used to produce bullet, shell and lighter flint.

Q7.Draw the structures of the following :
(i) XeF2
(ii) BrF5

Q8.Why a mixture of Carbon disulphide and acetone shows positive deviation from Raoult’s law ? What type of azeotrope is formed by this mixture ?

Q9.A current of 1.50 A was passed through an electrolytic cell containing AgNO3 solution with inert electrodes. The weight of silver deposited was 1.50 g. How long did the current flow ? (Molar mass of Ag = 108 g mol–1, 1F = 96500 C mol–1).
           OR
The conductivity of a 0.01 M solution of acetic acid at 298 K is 1.65  10–4 S cm–1.Calculate molar conductivity (^m) of the solution.

Q10.Which one of the following compounds is more reactive towards SN2 reaction and why ?

chemistry exam question paper

Q11.Give the formula of monomers involved in the formation of the following polymers :
(i) Buna-N
(ii) Nylon-6
(iii) Dacron

Q12.Calculate the freezing point of an aqueous solution containing 10.5 g of Magnesium bromide in 200 g of water, assuming complete dissociation of Magnesium bromide.(Molar mass of Magnesium bromide = 184 g mol–1, Kffor water = 1.86 K kg mol–1).

Q13.Write IUPAC name for each of the following complexes :
(i) [Ni(NH3)6]Cl2
(ii) K3[Fe(CN)6]
(iii) [Co(en)3]3+

Q14.Give reason for the following observations :
(i) When Silver nitrate solution is added to Potassium iodide solution, a negatively charged colloidal solution is formed.
(ii) Finely divided substance is more effective as an adsorbent.
(iii) Lyophilic colloids are also called reversible sols.

Q15.(i) Complete the following reaction and suggest a suitable mechanism for the
reaction :

chemistry exam question paper

(ii) Why ortho-Nitrophenol is steam volatile while para-Nitrophenol is less volatile ?

Q16.Write the product(s) formed when
(i) 2-Bromopropane undergoes dehydrohalogenation reaction.
(ii) Chlorobenzene undergoes nitration reaction.
(iii) Methylbromide is treated with KCN.

Q17.A reaction is first order in A and second order in B
(i) Write the differential rate equation.
(ii) How is the rate affected on increasing the concentration of B three times ?
(iii) How is the rate affected when the concentration of both A and B are doubled ?

Q18.

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Q19.

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Q20.Do as directed :
(i) Arrange the following compounds in the increasing order of their basic strength
in aqueous solution :
CH3NH2, (CH3)3N, (CH3)2NH. 

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Q21.Explain the following :
(i) Amino acids behave like salts rather than simple amines or carboxylic acids.
(ii) The two strands of DNA are complementary to each other.
(iii) Reaction of glucose that indicates that the carbonyl group is present as analdehydic group in the open structure of glucose.

Q22.Write the role of
(i) NaCN in the extraction of gold from its ore.
(ii) Cryolite in the extraction of aluminium from pure alumina.
(iii) CO in the purification of Nickel.

Q23.Mathew works in a multinational company where the working conditions are tough.He started taking sleeping pills without consulting a doctor. When his friend Amit came to know about it he was disturbed and advised Mathew not to do so. He suggested that Mathew should instead practice yoga to be stress free. Mathew is now relaxed and happy after practicing yoga.After reading the above passage, answer the following questions :
(a) List at least two qualities of Amit that helped Mathew to be happy.
(b) Pick out the odd chemical compound on the basis of its different medicinal property : Luminal, Seconal, Phenacetin and Equanil.
(c) Name the class of chemical compounds used in sleeping pills.
(d) Why is it advisable not to take the dose of sleeping pill without consulting a doctor ?

Q24.

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Q25.

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Q26.

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