2013 III 09

Time: 2% Hours

Total No. of Questions: 5

1000 Seat No. I I I I I ICHEMISTRY

(Revised Syllabus Pattern 2012)

Paper Code: @Jill]Subject Code:

lilim(Printed Pages: 13) Maximum Marks: 55

INSTRUCTIONS:

H-703-(010)(New)

(i) All questions are compulsory.

(ii) Answer each main question on a fresh page.

(iii) There is no overall choice, however internal

choice has been provided in two sub-questions of

4 marks and two sub-questions of 2 marks each.

(iv) Figures to the right indicate full marks.

(v) Use of calculator is not permitted, however logarithmic

table's will be provided on request.

(vi) Multiple choice questions should be attempted only

once.

(i) [Conld....

1. (A) Select the correct alternative from those given below and rewrite the

completed statement:

An element with atomic mass 100 u having bee structure has edge

length 400 pm. The density of the element is

(Given NA ~ 6.022 x 1023 atoms mol-l)

. 10.376 g/cm3

. 7.289 g/cm3

. 2.144 g/cm3

. 5.188 g/cm3

(B) What is shape selective catalysis?

(C) Explain the following observationa : 2

(i) Sky appears blue in colour.

(ii) A freshly formed precipitate of ferric hydroxide can be converted

to a colloidal sol by shaking it with a small quantity of ferric

<Woride.

703-{01O) (New) CD [Contd....

(D) Draw a neat labelled diagram to show metal excess defect due to

anionic vacancy. What colour is developed when excess of K is present

in KCI crystal?

(E) Name one chemical compound used in soaps to impart

antiseptic properties to it and also name one non-narcotic

analgesic which can be used as an antipyretic and to prevent

platelet coagulation. 2

(F) Answer the following: 3

(i) Write the IUPAC name of the coordination compound:

k[CI\H20)2(C204)2]'

(ii) Name the type of isomerism exhibited by :

[Co(N02)(NHa)5] Cl2 and [Co(ONOXNHa)5]CI2'

(iii) Draw the structures of optical isomers of :

[PtCI2(en)2J2+.

-(OlO)(New) CD [Contd....

2. (A) Select the correct alternative ITom those given helow and rewrite

the completed statement

Alkyl halides are prepared from alcohols hy treating

with ..

. CU2CI2 + HCI

(B) Draw a neat lahelled schematic diagram to show the magnetic

sepa~ation of ore.

(C) Descrihe the role of the following 2

(i) Cryollite or CaF 2 in. the metallurgy of Aluminium.

(ii) Collectors in the IToth-floatation process.

H-703--(OlO)(New) CD IContd....

. KCI+ HN03

. HCI + ZnCI2

. CI21 UV light

(D) Complete the following chemical equations: 2

(i) C6H5Cl + CHsCOCl Anhydrous AICI, ,

(ii) C2H5CI + Na dry ether,

(E) Answer the following:

(i) Write the structures of monomers in the following

polymer

0 0II II

[-C-(CH2),O-C-NH-(CH2),-NH-]n

(ii) Classify the following as addition and condensation

polymers :

Dacron, Polythene, Nylon 6, 6 Bakelite.

(F) Give scientific reasons for the following :

(i) Protein loses its biological activity when subjected to

change in temperature and pH.

(ii) A person suffering from pernicious anaemia is advised to

consume meat, fish, egg and curd.

(iii) Sncrose is a non-reducing disaccharide.

-(OlO)(New) (5) [Contd...

3. (A) Select the correct alternative from those given below and rewrite

the completed statement:

The differential rate law for the reaction H2 + 12 -; 2HI

is .......

(8) What is the order of a reaction whose rate constant has the

same units as the rate of a reaction?

(C) For a decomposition reaction the value of rate constant at two

different temperatures are as follows: 2

k, =2.15 x IO-s 8-1 at 650 K,

1,2 = 2.39 x 10-7 s-1 at 700 K

Calculate the energy of activation (R = 8.314 JK-l mol-l).

1-703-{01O)(New) CD [Conal....

. - 2 d[H2! -2d[I,] d[H!]dt dt dt

. .! d[H,J = .!d[l,! - d[HI]2 dt 2 dt dt

. d[H,! d[I,! =.! d[HI]dt dt 2 dt

. -d[H,! = -d[I,! = -d[HI!dt dt dt

(C) The initial concentration of NZOS in the following first order

reaction: 2

N,05 -. 2NO + i!.02 was 1.24 x 10-2 mol L-1 at 318 K2

The concentration of NZOS after 60 minutes was 0.20 x

10-2 mol L-1 Calculate the rate constant of the reaction at

318 K

(D) Write complete chemical equations for fthe following : 2

(i) Oxidation of FeZ+ by CrzO ¥- in acidic medium.

(ii) Oxidation of S,O~- by MnO. in neutral aqueous medium.

(E) Explain giving reasons : 2

(i) Transition metals and their compounds are generally found

to be good catalysts.

(ii) The actinoids exhibit a larger number of oxidation states

than the corresponding lanthanoids.

(F) A solution is prepared by mixing cyclohexane and ethanol. Draw

a graph and name the type of deviation from Raoults

law observed for this. What type of azeotrope will be

formed ?

-(OlO)(New) (2) (Conld....

I. (A) Select the correct alternative from those given below and rewrite

the completed statement

Osmotic pressure of a solution containing 6.0 g protein in

150 mL aqueous solution at 27°C is 1.5 x 10-1 atm. The molar

mass of the protein is g mol-l

(R = 0.0821 L atm K-l mol-I)

. 5910

. 6567

. 591

. 657

(B) Write a chemical labelled equation to show the reaction

of aniline with chloroform in presence of ethanolic

KOH.

(C) Answer the following:

(i) Arrange the following in the decreasing order of their basic

strength:

NHs, C6HSNH2 and C2HSNH2'

(ii) Write a chemical equation to show the conversion of

benzene diazonium chloride to a yellow dye.

i-703-(010)(New) CD [Contd....

(C) Answer the following 2

(i) Explain why tertiary amines are less soluble in water than

primary and secondary amines ?

(ii) Write a chemical equation to show the conversion of

benzene diawnium cbloride to fluorobenzene.

(D) IdentifY A and B in the following chemical equations: 3

(i) @JSO'H

A Oleum 0 (i) NaOH- ---> ?

(h)H'B.

(ii) ~ CrO" HCHO (i) CH,MgBr, ~(ii)H,O'

ONa

@ CH,I)A~Ethanoic acid

B(iii)

(Major proudct)

HOlO)(New) CD [Contd....

(1<:) With reference to p-block elements answer the following 4

(i) Arrange the hydrides of Group 16 in the order of their

decreasing thermal stability.

(ii) Complete and balance the following chemical eqnation

Ag + PClS -7

(iii) Explain why elements of Group 16 show lower

value of ionisation enthalpy compared to elements of

Group 15 ?

(io) Draw the structure of sulphurous acid.

Or

(E) With reference to p-block elements answer the following 4

(i) Arrange the hydrogen halides in the increasing order of

their stability.

(ii) Complete and balance the following chemical

equation:

Mn°2 + HCI -7

HOI0)(New) @ [Conld....

(iii) Explain why fluorine exhibits only -1 oxidation state where

as other halogens exhibit + 1, + 3, + 5 and + 7 oxidation

states?

(iv) Draw a structure of XeOF4.

(A) Select the correct alternative from those given below and rewrite

the completed statement:

(i) Br,lRed P

The chemical reaction, RCH2 COOH . 'R-CH-COOH(ii)H,O I

Br

is known as

. Swarts reaction

. Hell. Vo!hard Zelinsky reaction

. Wurtz reaction

. Hoffinann. reaction

(B) Calcnlate the number of Coulombs reqWred to deposit 6.75 grams

of Aluminium.

(Atomic mass of AI = 27 u, F = 96500 Coulomb)

I3-(OlO)(New) @) [Contd....

(C) Name the property by which white phosphorous glows in the

dark. Write a balanced cbemical equation to show the reaction of

white phosphorous in air. 2

(D) Draw a scbematic diagram for the following representation

of a Galvanic cell and calculate its e.m.£. if E"cen = 1.05 V

at298K:

Ni INi(NOa)2(O.270M) II AgNOa(O.OOlM) lAg.

(E) An alkyl benzene undergoes rigorous oxidation with alkaline

KMn04 followed by hydrolysis to give compound A. Compound A

when treated with thionyl chloride formed compound B.

Compound B reacts with dimethyl cadmium to give compound C.

Compound C on treatment with zinc amalgam in presence of

concentrated HCI gave compound D. Write the sequence of all the

chemical reactions involved and identify compounds A, B, C

and D. 4

HOlOHNew) @

(E) Benzenereacts with carbon monoxide and HCI in presence of

anhydrous AICIS .to give compound A. Compound A on treatment

with concentrated KOH gave compound B, along with a salt of

an acid. Compound B wben oxidised with alkaline KMn04

follbwed by hydrolysis gave compound C. Compound C when

heated with phosphorous pentoxide in presence of an acid gave

compound D. Write the sequence of the chemical equations

involved and identify compounds A, B, C, and D. 4