CBSE Academic Class XII Chemistry Sample Question Paper

Name of the Board : CBSE Academic
Class : XII STD
Subject : Chemistry

Website : http://cbseacademic.in/SQP_CLASSXII_2015_16.html
Download Sample Question Paper : https://www.pdfquestion.in/uploads/8074Chemistry.pdf

Chemistry Sample Question Paper :

Time : 3 hrs
MM : 70

Related : CBSE Academic Class XII Sociology Sample Question Paper 2016 : www.pdfquestion.in/8072.html

General Instructions:
1. All the questions are compulsory.
2. Q. No. 1 to 5 are very short answer type, carrying 1mark each.
3. Q. No. 6 to 10 are short answer type, carrying 2 marks each.
4. Q. No. 11 to 22 are short answer type, carrying 3 marks each.
5. Q.No.23 is a value based question carrying 4 marks.
6. Q. No. 24 to 26 are long answer type, carrying 5 marks each.
7. Use of calculators is not allowed, use log tables wherever required

1. Name the non stoichiometric point defect responsible for colour in alkali metal halides.
2. What is shape selective catalysis?
3. Amongst the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields a single monochloride.
4. Give the IUPAC name and structure of the amine obtained when 3-chlorobutanamide undergoes Hoffmann –bromamide reaction.
5. How many ions are produced from the complex,[Co (NH3)6]Cl2 in solution?
6. Will the elevation in boiling point be same if 0.1 mol of Sodium chloride or 0.1 mol of sugar is dissolved in 1L of water? Explain

7. The following curve is obtained when molar conductivity ( m ) is plotted against the square root of concentration, c1/2 for two electrolytes A and B
(a) How do you account for the increase in the molar conductivity of the electrolyte A on dilution.
(b) As seen from the graph, the value of limiting molar conductivity for electrolyte B cannot be obtained graphically. How can this value be obtained?

8. Name the following
(a) A transition metal which does not exhibit variation in oxidation state in its compounds.
(b) A compound where the transition metal is in the +7 oxidation state.
(c) A member of the lanthanoid series which is well known to exhibit +4 oxidation state.
(d) Ore used in the preparation of Potassium dichromate.

9. Arrange the following in order of property indicated for each set
(a) F2, Cl2, Br2, I2 – increasing bond dissociation enthalpy
(b) PH3, AsH3, BiH3, SbH3, NH3 – increasing base strength

10. (a) Predict the major product of acid catalysed dehydration of 1-Methylcyclohexanol.
(b) You are given benzene, conc.H2SO4, NaOH and dil.HCl. Write the preparation of phenol using these reagents.
OR
Draw the structures of any two isomeric alcohols (other than 1o alcohols) having molecular formula C5H12O and give their IUPAC names.

11. An element occurs in the bcc structure with cell edge of 288 pm. The density of the element is 7.2 g cm-3. How many atoms of the element does 208g of the element contain?

12. Calculate the boiling point of a 1M aqueous solution (density 1.04 g mL-1) of Potassium chloride (Kb for water = 0.52 K kg mol-1, Atomic masses: K=39u, Cl=39.9u) Assume, Potassium chloride is completely dissociated in solution

13. A galvanic cell consists of a metallic zinc plate immersed in 0.1M Zn(NO3)2 solution and metallic plate of lead in 0.02M Pb(NO3)2 solution. Calculate the emf of the cell. Write the chemical equation for the electrode reactions and represent the cell.

14. Answer the following questions
(a) What happens when a freshly precipitated Fe (OH)3 is shaken with a little amount of dilute solution of FeCl3?
(b) Why are lyophilic colloidal sols more stable than lyophobic colloidal sols?
(c) What form Freundlich adsorption equation will take at high pressure?

17. (i) Describe the type of hybridisation for the complex ion [Fe(H2O)6]2+.
(ii) Write the IUPAC name of the ionisation isomer of the coordination compound [Co(NH3)5Br]SO4. Give one chemical test to distinguish between the two compounds.

19. Give the structures of A, B and C in the following reactions:
20. (a) A non reducing disaccharide ‘A’ on hydrolysis with dilute acid gives an equimolar mixture of D-(+)-glucose and D-(-)-Fructose.
Identify A. What is the mixture of D-(+)- glucose and D-(-)-Fructose known as? Name the linkage that holds the two units in the disaccharide.
(b) amino acids have relatively higher melting points than the corresponding halo acids. Explain.
21. (a) Pick out the odd one from among the following on the basis of their medicinal properties mentioning the reason: Luminal, Seconal, Phenacetin, Equanil.
(b) Give an example of a substance that can act as a disinfectant as well as antiseptic depending upon its concentration. (Specify concentration)
(c) Name any two macromolecules chosen as drug targets.