I t-puc SUPPLIMENTARY EXAMINATION, MAy_2015CHEMISTRY (34)

&.snJ' Max. Marks:70Times: 3 Hour 15 Minutes

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-(i) The question paper has four parts A, Bl g & D. A[ rhe parts are compursory.(ii) write balanced chemical equations and draw lauerreJ iiajialrs wnererrer asked.(iii) Use los tables and simple catcutators ir necessary. ia";;;#"ili;';Leiii="'i" no, a,owed)

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'1.

2.

3.4.5.

6.

7.

8.

L10.

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11.

12.

13.

14.

PART-A

Answer atl questions :(Answer each question in one word or in one sentence)Express 0.000056 in scientific notation.What is thermal energy?Define PH.

State modern periodic law.What is a reducing agent?write the balanced chemical equation for the reaction between Na2o2 and water.write the general erectronic configuration of 13th group elements.

'- "-'::'Give reason: Graphite is used as lubricant.Write the functional group of aldehydes.Write the IUPAC name of the compound.CHgCH = C(CHg)z

tPAHT.B

10x1=10

5x2=1O

5x3=1533

1+1+1

Answer any Five questions:(Each question carries two marks)State law of multiple proportions.A vessel of 2S0 ml capacity contains a qasis transferred to another vessel of ,otufi"would be its pressure?State Octet rule.Why Lithium shows anamolous behaviorgroup?

at 35oC and 2.4 bar pressure. The gas400 ml at the same temperature. W-nai

over the other elements of the same

15. How is diborane prepared from BFg?16. State Markownikoff,s rule.17. Explain Friedel-Craft's alkylation with an example.18. What are pesticides? Give an example.

lll Answer any Five questions: PABT-C

(Each question carries three marks)19. Define ronisation entharpy. How does it vary arong a period and down the group?20. Mention the favourabre conditions for the formation of an ionic bond.21. Based on VSEpR theory mention the shapes of

a) BeCl2 b) CH4 c) NH322' Draw the energy level . diagram for He2 molecule using Mor. write its electronicconfiguration. Calculate its b-ond order.23' Balance the foilowing redox reaction by oxidation number method.

Cr.Oiu", + SO3;", r cti;, + SOi^- in acidic medium.24. a) Complete the following reactions

i) PbS(.; -F H.or,"n,.+

2Na1s1 + 2HrO,,, ->

3.) -d

1

1

1

ii)

b)

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What is singas ?

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25. How is plaster of paris prepared? Mention its use.26. Write any three anomalous behavior of carbon over other elements of the same group.

PART-D

Answer any Ftve questions:(Each question carries five marks)a) An organic compound contains 807o carbon and 207" hydrogen. lf

molecular lormula of the compound is 30,, determine empirical formulamolecular formula of the compound.

b) Define mole. Write the value of Avogadro constant.

theand

27.

28. a)b)

29. a)b)

-6)30. a)

b)

31. a)b)e)

32. a)

Write any four postulates of Bohr's theoryWho discovered neutrons?

Derive de-broglie's matter-wave equation.State Hund's rule of maximum multiplicity;What is an orbital?

Write any four assumptions of kinetic molecular theory of gases.Define normal boiling point.

What are extensive properties? Give an example.Define enthalpy of combustion.State first law of thermodynamics.

Calculate the enthalpy of formation of methanol (CH3OH(4), given that,enthalpy of combustion of methanol, caibon and hydrogen are, -726 KJmol'1,-393 KJmol-1, and -286 KJmol-t respectively.Define entropy.

State Le-Ghatelier's pri nciple.Whai is homogeneous equilibrium? Give an example.Give an example for the reaction in which Kp = Kc.

What are weak electrolytes? Give an example.Calculate the [H"] of a solution of Hydrochloric acid, whose PH is 3.6.Write the value of ionic product of pure water at 298 K.

Answer any Two questions:(Each question carries five marks)a) Explain chain isomerism with an example.b) What is inductive effect?c) Name the reaction intermediate formed, during homolytic fission of a covalent

bond.

5x5=25

32

41

2

2

1

41

22

1

4{I

2

2

1

221

5x2='t022

33.

b)

a)b)c)

a)b)c)

32

32

37. a)b)

34.

v

OE

36. a)

b)

Explain the principle and calculations involved in the estimation of halogensby carius method.How is sodium fusion extract prepared?

Explaln the rnechanism of Chlorination of Benzene.How is ethyne prepared from Calcium Carbide?

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