CBSE Board Class 11 Chemistry Sample Papers 2008
CBSE Board Sample Papers 2008 for Class 11 Chemistry
Class – XI
Subject – Chemistry
Time: 3 hrs. .
1.All questions are compulsory.
2.Marks for each question are indicated against it.
3.Questions number 1to 8 are very short –answer questions, carrying 1 mark each. Answer these in one word or about one sentence each.
4.Questions number9 to18 are short –answer questions, carrying 2 marks each. Answer these in about 30 words each.
5.Questions number19 to27 are short –answer questions, carrying 3 marks each. Answer these in about 40 words each.
6.Questions number28 to30 are long-answer questions of 5 marks each. Answer these in about 70 words each.
7.Use log tables, if necessary. Use of calculators is not permitted.
Q1 Define law of multiple proportions. (1)
Q2 What are representative elements? (1)
Q3 Alkali metals are good reducing agents. Why? (1)
Q4 Amongst LiF and LiI which has more covalent character and why? (1)
Q5 CCl4 does not act as a Lewis acid while SiCl4 and SnCl4 act as Lewis acids. Why? (1)
Q6 What is inert pair effect? (1)
Q7 Amongst isopentane and neopentane which has higher boiling point and why? (1)
Q8 Methane does not react with chlorine in dark. Why? (1)
Q9 Calculate the weight of iron which will be converted into its oxide by the action of 18 g of steam. (At. Wt of Fe=56a.m.u) (2)
Q10 What are Empirical and Molecular formulae? (2)
Q11 (i) Why don’t we draw a boundary surface diagram within which the probability of finding the electrons is 100%?
(ii) Why the ball hit with a hockey by a player does not make a wave? (1+1)
Q12 What is the energy in joules required to shift the electron of the hydrogen atom from the first Bohr orbit to the fifth Bohr orbit and what is the wavelength of the light emitted when the electron returns to the ground state? The ground state electron energy is −2.18X10-11 ergs.
(v=3 X1010cm/sec h=6.626X10-27ergs sec)
Q13 Give reasons for the following;
(i)The boiling point of ethyl alcohol is greater than that of diethyl ether.
(ii)BCl3 and BF3 are non-polar. (1+1)
Q14 For the reaction, 2Cl (g) Cl2 (g), what are the signs of H and S? (2)
Q15 Comment on the thermodynamic stability of NO (g), given
N2 (g) + O2 (g) 2NO (g) H= 180 kJ mol-1
2NO (g) + O2 (g) 2NO2 H= 148 kJ mol-1 (2)
Q16 A white solid is either Na2O or Na2O2. A piece of red litmus paper turns white when it is dipped into a freshly made aqueous solution of the white solid.
(i)Identify the white solid and give reason for the reaction.
(ii)Explain what would happen to the red litmus if the white solid were the other compound?(2)
Q17 Explain the following:
(i)Sodium is less reactive than potassium.
(ii)Lithium is the only alkali metal to form nitride directly. (2)
Q18What is inductive effect? Explain. (2)
Q19 Explain the following:
(i)There are only 14 lanthanides and only 14 actinides.
(ii)Electron affinities of halogens are very high.
(iii)Noble gases have zero electron affinity. (3)
Q20 (a) Define the following terms
(i) Hybridization (ii) Polarization
(b) What is the basic idea of Molecular Orbital Theory? (2+1)
Q21 Balance following equation in acidic medium by using oxidation number method or ion-electron method.
As2S3(s) + NO3-(aq) +H+(aq) AsO43- (aq) +S(s) + NO2(g) +H2O (3)
Q22 Balance following equation in basic medium by using oxidation number method or ion-electron method.
MnO4-(aq) + I- (aq) MnO2(s) +I2 (s) (3)
Q23 Explain the following reactions:
(i)Silicon is heated with methyl chloride at high temperature in the presence of copper.
(ii)Silicon dioxide is treated with hydrogen fluoride.
(iii)CO is heated with ZnO. (3)
Q24 Write IUPAC names of the following compounds:
Q25 Explain Markovnikov and anti-Markovnikov rule with suitable examples. (3)
Q26 What are the characteristics of chemical equilibrium? (3)
Q27 For the equilibrium,
2NOCl (g) 2 NO (g) + Cl2 (g), the value of the equilibrium constant, Kc is 3.75 X 10-6 at 1069K. Calculate Kp for the reaction. (3)
Q28 Explain giving reasons:
(i)Sn2+ and Fe3+ cannot coexist in the same solution.
(ii)Graphite is a good conductor of electricity.
(iii)SnCl2 has high melting point whereas SnCl4 has low melting point.
(iv)CCl4 does not act as a Lewis acid while SnCl4 act as Lewis acid.
(v)CO2 is a gas while silica is a solid. (5)
(a)Explain why is there a phenomenal decrease in ionization enthalpy from carbon to silicon?
(b)How would you explain the lower atomic radius of Ga as compared to Al? (3+2)
Q29 (a) What is Resonance? Explain with suitable examples.
(c)What is electromeric effect?
(d)What is Hyperconjugation? How the name no bond resonance is fit for the same?
(a)What is Isomerism? Explain its different types.
(b)How does the fission of covalent bond takes place? Explain. (3+2)
Q30 (a) An alkene ‘A’ on ozonolysis gives a mixture of ethanal and pentan-3-one. Write structure and IUPAC name of ‘A’. (2)
(c)Carry out the following conversions;
(i) Ethyne to benzene (ii) Propanoic acid to ethane (iii) Benzene to toluene (3)
(a)Taking suitable example explain Electrophilic substitution mechanism in benzene.
(b)Out of benzene, m-dinitrobenzene and toluene which will undergo nitration more easily and why? (3+2)
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