(i) All questions are compulsory.
(ii) Q. no. 1 to 5 are very short answer questions and carry 1 mark each.
(iii) Q. no. 6 to 10 are short answer questions and carry 2 marks each.
(iv) Q. no. 11 to 22 are also short answer questions and carry 3 marks each.
(v) Q. no. 23 is a value based question and carry 4 marks.
(vi) Q. no. 24 to 26 are long answer questions and carry 5 marks each.
(vii) Use log tables if necessary, use of calculators is not allowed.
- Q1VIEW SOLUTION
- Q2VIEW SOLUTION
- Q3VIEW SOLUTION
- Q4VIEW SOLUTION
- Q5VIEW SOLUTION
- Q6VIEW SOLUTION
- Q7VIEW SOLUTION
Name the reagents used in the following reactions:
What is meant by positive deviations from Raoult's law? Give an example. What is the sign of ∆mixH for positive deviation?
Define azeotropes. What type of azeotrope is formed by positive deviation from Raoult's law ? Give an example. VIEW SOLUTION
(a) Following reactions occur at cathode during the electrolysis of aqueous silver chloride solution :VIEW SOLUTION
On the basis of their standard reduction electrode potential (E°) values, which reaction is feasible at the cathode and why ?
(b) Define limiting molar conductivity. Why conductivity of an electrolyte solution decreases with the decrease in concentration ?
3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the van't Hoff factor and predict the nature of solute (associated or dissociated).VIEW SOLUTION
(Given : Molar mass of benzoic acid = 122 g mol−1, Kf for benzene = 4.9 K kg mol−1)
(i) Indicate the principle behind the method used for the refining of zinc.VIEW SOLUTION
(ii) What is the role of silica in the extraction of copper?
(iii) Which form of the iron is the purest form of commercial iron?
- Q13VIEW SOLUTION
- Q14VIEW SOLUTION
(i) Draw the geometrical isomers of complex [Pt(NH3)2Cl2].VIEW SOLUTION
(ii) On the basis of crystal field theory, write the electronic configuration for d4 ion if ∆0 < P.
(iii) Write the hybridization and magnetic behaviour of the complex [Ni(CO)4].
(At.no. of Ni = 28)
- Q16VIEW SOLUTION
Give reasons for the following observations :VIEW SOLUTION
(i) Leather gets hardened after tanning.
(ii) Lyophilic sol is more stable than lyophobic sol.
(iii) It is necessary to remove CO when ammonia is prepared by Haber's process.
- Q18VIEW SOLUTION
Predict the products of the following reactions :VIEW SOLUTION
How do you convert the following :
(i) Phenol to anisole
(ii) Propan-2-ol to 2-methylpropan-2-ol
(iii) Aniline to phenolOR
(a) Write the mechanism of the following reaction :
(b) Write the equation involved in the acetylation of Salicylic acid. VIEW SOLUTION
(i) Which one of the following is a disaccharide : Starch, Maltose, Fructose, Glucose ?VIEW SOLUTION
(ii) What is the difference between fibrous protein and globular protein ?
(iii) Write the name of vitamin whose deficiency causes bone deformities in children.
Give reasons :VIEW SOLUTION
(a) n-Butyl bromide has higher boiling point than t-butyl bromide.
(b) Racemic mixture is optically inactive.
(c) The presence of nitro group (−NO2) at o/p positions increases the reactivity of haloarenes towards nucleophilic substitution reactions.
Mr. Roy, the principal of one reputed school organized a seminar in which he invited parents and principals to discuss the serious issue of diabetes and depression in students. They all resolved this issue by strictly banning the junk food in schools and to introduce healthy snacks and drinks like soup, lassi, milk etc. in school canteens. They also decided to make compulsory half an hour physical activities for the students in the morning assembly daily. After six months, Mr. Roy conducted the health survey in most of the schools and discovered a tremendous improvement in the health of students.VIEW SOLUTION
After reading the above passage, answer the following :
(i) What are the values (at least two) displayed by Mr. Roy ?
(ii) As a student, how can you spread awareness about this issue ?
(iii) What are tranquillizers ? Give an example.
(iv) Why is use of aspartame limited to cold foods and drinks ?
(a) Account for the following :(i) Acidic character increases from HF to HI.
(ii) There is large difference between the melting and boiling points of oxygen and sulphur.(iii) Nitrogen does not form pentahalide.
(b) Draw the structures of the following :(i) ClF3
(i) Which allotrope of phosphorus is more reactive and why?(ii) How the supersonic jet aeroplanes are responsible for the depletion of ozone layers?
(iii) F2 has lower bond dissociation enthalpy than Cl2. Why?(iv) Which noble gas is used in filling balloons for meteorological observations?
(v) Complete the equation :
An aromatic compound 'A' of molecular formula C7H7ON undergoes a series of reactions as shown below. Write the structures of A, B, C, D and E in the following reactions :
(a) Write the structures of main products when aniline reacts with the following reagents :(i) Br2 water
(ii) HCl(iii) (CH3CO)2O/pyridine
(b) Arrange the following in the increasing order of their boiling point :C2H5NH2, C2H5OH, (CH3)3N
(c) Give a simple chemical test to distinguish between the following pair of compounds :(CH3)2NH and (CH3)3NVIEW SOLUTION
For the hydrolysis of methyl acetate in aqueous solution, the following results were obtained :
t/s 0 30 60 [CH3COOCH3] / mol L–1 0.60 0.30 0.15
(i) Show that it follows pseudo first order reaction, as the concentration of water remains constant.
(ii) Calculate the average rate of reaction between the time interval 30 to 60 seconds.
(Given log 2 = 0.3010, log 4 = 0.6021)
(a) For a reaction A + B → P, the rate is given by
Rate = k[A] [B]2
(i) How is the rate of reaction affected if the concentration of B is doubled ?
(ii) What is the overall order of reaction if A is present in large excess ?
(b) A first order reaction takes 30 minutes for 50% completion. Calculate the time required for 90% completion of this reaction.
(log 2 = 0.3010)VIEW SOLUTION
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