vit - chemistry -2008 unsolved paper
TRANSCRIPT
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VIT – PAST PAPERS
CHEMISTRY - UNSOLVED PAPER - 2008
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SECTION – I
Single Correct Answer Type There are five parts in this question. Four choices are given for each part and one of them is
correct. Indicate you choice of the correct answer for each part in your answer-book by
writing the letter (a), (b), (c) or (d) whichever is appropriate
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01 ?
a.
b.
c.
d.
Problem
675K3 3 3CH CH HNO
3 2 2CH CH NO
3 2 2 3 2CH CH NO CH NO
3 22CH NO
3 22CH NO
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02When acetamide is hydrolysed by boiling with acid, the product obtained is
a. acetic acid
b. ethyl amine
c. ethanol
d. acetamide
Problem
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Problem03Which will not go for diazotization?
a.
b.
c.
d.
6 5 2C H NH
6 5 2 2C H CH NH
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Problem04Secondary nitro alkanes can be converted into ketones by using Y. Identify Y from
the following
a. aqueous HCl
b. aqueous NaOH
c.
d. CO
4KMnO
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Problem05Alkyl cyanides undergo Stephen reduction to Produce
a. aldehyde
b. secondary a,lline
c. primary amine
d. amide
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Problem06The continuous phase contains the dispersed phase throughout, example is
a. water in milk
b. fat in milk
c. water droplets in mist
d. coil in water
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Problem07The number of hydrogen atoms present in 25.5 g or sucrose which
has a molar mass of 342.3 g is
a.
b.
c.
d.
12 22 11C H O
2322 x 10
239.91 x 10
2311 x 10
2344 x 10 H atoms
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Problem08Milk changes afLer digestion into
a. cellulose
b. Fructose
c. glucose
d. lactose
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Problem09Which of the follm,ing ser consists only of essential amino acids?
a. Alanine, tyrosine, cystine
b. Leucine, lysine, tryptophane
c. Alanine, glutamine, lycine
d. leucine, proline, glycine
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Problem10Which of the following is a ketohexose?
a. Glucose
b. Sucrose
c. Fructose
d. Ribose
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Problem11The oxidation, number of oxygen in is:
a. 3, 2
b. 1, 0
c. 0, 1
d. - 0.33. -1
3 2 2KO , Na O
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Problem12Reaction of and PhMgBr would give
a. bromo benzene
b. chIorobenzene
c. triphenylphosphine
d. dichlorobenzene
3PCl
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Problem13Which of the following is not a characteristic of transition elements?
a. Variable oxidation states
b. Formation of coloured compounds
c. Formation of interstitial compounds
d. Natural radioactivity
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Problem14Cl – P – Cl bond angles in molecule are
a.
b.
c.
d.
5PCl
60 and 90
120 and 90
60 and 120
60 and 120
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Problem15The magnetic moment of a salt containing ion is:
a. 0
b. 1.87
c. 5.92
d. 2
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Problem16The number of formula units of calcium fluoride , present in 146.4 g
of (the molar mass of is 78.08 g/mol) is
a.
b.
c.
d.
2CaF
2CaF 2CaF
2421.146 x 10 CaF
2427.808 x 10 CaF
2421.129 x 10 CaF
2421.877 x 10 CaF
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Problem17The IUPAC name of the given compound is:
a. penta amino cobalt chloride chlorate
b. c,obalt penta ammine chloro chloride
c. pentamine chIaro cobalt (III) chloride
d. penta amino cobalt (III) chlorate
3 25Co NH Cl Cl
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Problem18When SCN- is added to an aqueous solution containing Fe(N03h, the ,complex ion
produced is
a.
b.
c.
d.
2
2 2Fe OH SCN
2
2 8Fe OH SCN
6
2Fe OH SCN
2
2 5Fe OH SCN
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Problem19Hair dyes contain
a. copper nitrate
b. gold chloride
c. silver nitrate
d. copper sulphate
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Problem20Schottky defects occurs mainly in eletrovalent compounds where
a. positive ions and negative ions are of different size
b. positive ions and negative ions are of same size
c. positive ions are small and negative ions are big
d. positive ions are big and negative ions are small
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Problem21The number of unpaired electrons calculated in are
a. 4 and 4
b. 0 and 2
c. 2 and 4
d. 0 and 4
3 3
3 66Co NH and Co F
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Problem22The standard free energy change of a reaction is
at 298 K. Calculate the equilibrium constant .
a. 20.16
b. 2.303
c. 2.016
d. 13.83
G 115 kJ
1 1p pK in log K R 8.314 Jk mol
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Problem23If an endothermic reaction occurs spontaneously at constant temperature (T)
and pressure (p), then which of the following is true?
a.
b.
c.
d.
G 0
> 0
S < 0
S > 0
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Problem24If a plot of versus t gives a straight line for a given reaction, then the
reaction is
a. zero order
b. first order
c. second order
d. third order
10log C
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Problem25A spontaneous process is one in which the system suffers
a. no energy change
b. a lowering of free energy
c. a lowering of entropy
d. an increase in internal energy
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Problem26The half-life period of a first order reaction is 1 min 40 s. Calculate its rate
constant.
a.
b.
c.
d.
3 16.93 x10 min
36.93 x 10 s
36.93 x 10 s
3 -16.93 x 10 s
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Problem27The molar conductivities of KCl, NaCl and
respectively. What is the molar conductivity of ?
a.
b.
c.
d.
2 13KNO are 152, 128 and 111 S cm mol
3NaNO
2 1101 S cm mol
2 187 S cm mol
2 1 391 S cm mol
2 1101 S cm mol
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Problem28The electrochemical cell stops working after sometime because
a. electrode potential of both the electrodes becomes zero
b. electrode potential of both the electrodes becomes equal
c. one of the electrodes is eaten away
d. the cell reaction gets reversed
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Problem29The amount of electricity required to produce one mole of copper from copper
sulphate solution will be
a. 1 F
b. 2.33 F
c. 2 F
d. 1.33 F
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Problem30Dipping iron article into a strongly alkaline solution of sodium phosphate
a. does not affect the article
b.
c. forms iron phosphate film
d. forms femc hydroxide
2 3 2forms Fe O .xH O on the surface
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Problem31Hydroboration oxidation of 4-methyl octane would give
a. 4-methyloctanol
b. 2-methyl decane
c. 4-methyl heptanol
d. 4-methyl-2-octanone
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Problem32When ethyl alcohol is heated with , the product obtained is
a.
b.
c.
d.
2 4conc. H SO
3 2 5CH COOC H
2 2C H
2 6C H
2 4C H
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Problem33Anisole is the product obtained from phenol by the reaction known as
a. coupling
b. etherification
c. oxidation
d. esterification
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Problem34Ethylene glycol gives oxalic acid on oxidation with
a.
b.
c.
d. periodic acid
2 2 7acidified K Cr O
4acidified KMnO
4alkaline KMnO
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Problem35Diamond is hard because
a. all the four valence electrons are bonded to each carbon atoms by
covalent bonds
b. it is a giant molecule
c. it is made up of carbon atoms
d. it cannot be burnt
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Problem36A Wittig reaction with an aldehyde gives
a. ketone compound
b. a long chain fatty acid
c. olefin compound
d. epoxide
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Problem37Cannizaro reaction is given by‘
a. HCHO
b.
c.
d. 3 2CH CH OH
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Problem38 Identify the reactant.
a.
b. HCHO
c. CO
d. 2H O
3CH CHO
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Problem39Maleic acid and fumaric acid are
a. position isomers
b. geometric isomers
c. enantiomers
d. functional isomers
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Problem40The gas evolved on heating alkali formate with soda-lime is
a. CO
b.
c. hydrogen
d. water vapour
2CO