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