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MCAT Past paper 2013 Chemistry portion

Chemistry MCQs MCAT 2013 Paper

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MCAT 2013 Chemistry MCQs

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45.A sample of Neon is foun to exist as 20Ne,21Ne,22Ne.mass spectrum of ‘Ne’ is as

follows:
90.92% 0.257% 8.82%
What is the relative atomic mass(A,value) of Neon?
a.20.28
b.20.10
c.20.28
d.20.22
46.Hydrogen burns in chlorine to produce hydrogen chloride.the ratio of masses of
reactants in chemical reaction H2+cl2–2Hcl is:
a.1:35.5
b.2:35.5
c.1:71
d.2:70
47.the coordination number of Na+ in Nacl crystal is:
a.2
b.4
c.6
d.8
48.There are four gases H2,He,N2 and CO2 at 0°C.which gas shows greater non-ideal
behavior?
a.He
b.H2
c.N2
d.CO2
49.Correct order of energy in the given subshells is:
a.5s>3d>3p>4s
b.3p>3d>5s>4s
c.3p>3d>4s>5s
d.5s>3d>4s>3p
50.numbe rof electrons in the outermost shell of chloride ion (cl-)is:
a.3
b.1
c.0
d.17
52.According to valence shell electron pair repulsion theory,the repulsive forces between
the electron pair of central atom of molecule are in the order:
a.Lone-pair-lone-pair>lone-pair-bond pair>bond pair-bond pair
b.lone pair-bond pair?lone pair-lone pair?bond pair-bond pair
c.bond pair-bond-pair?lonepair-lone pair>lone pair-bond pair
d.lone pair-bond pair>bond pair-bond pair?lone pair-lone pair
52.in crystal lattice of ice,each O-atom of water molecule is attached to:
a.one H-atom
b.two H-atoms
c.three h-atoms
d.four H-atoms
53.heat of formation (H°,)for CO2 is:
a.-394 KJ/mole
b.+394 KJ/mole
c.-294KJ/mole
d.-390KJ/mole
54.reactions have high energy than products in:
a.exothermic reactions
b.endothermic reactions
c.photochemical reactions
d.non-spontaneous reactions
55.If 18.0 g of glucose is dissolved in 1kg of water,boiling point of this solution should be:
a.100.52°C
b.100.00°C
c.100.052°C
d.less than 100°C
56.Molal freezing point constant of water is:
a.1.86
b.2.86
c.11.86
d.0.52
57.In the figure given below,the electron flow in external circuit is from:
a.copper to zinc electrode
b.right to left
c.porous partition to zinc electrode
d.zinc to copper electrode
58.which one of the following is a redox reaction?
a.NaCl+AgNO3-NaNO3+AgCl2
b.2Na+cl2—->2NaCl
c.2Cl—Cl2+2ed.
Na++1e—Na
59.the chemical substance,when dissolved in water,gives “H” is called:
a.acid
b.base
c.Amphoteric
d.neutral
60.The ‘pH’ of our blood is:
a.7.35-7.4
b.6.7-8
c.7.9
d.7.5
61.in zero order reaction,the rate is independent of:
a.concentration of the product
b.concentaraion of the reactant
c.temperature of the reaction
d.surface area of the product
62.By considering Arrenhenius equation,the graph between ‘1/T’ and ‘log K’ given a curve
of the type:

d.
63.what is the trend of melting and boiling point of the elements of short periods as we
move from left to right in a periodic table?
a.melting an boiling points first decrease then increase
b.melting and boiling points increase gradually
c.melting and boiling points first increase then decreased
d.melting and boiling points decrease gradually
64.Along a period,atomic radius decreases.this gradual decrease in radius is due to:
a.increase in number of electrons in valence shells.
b.increase in number of protons in the nucleus
c.decrease in number of shells
d.increase in number of shells
65.Alkaline earth metal oxides react with water to give hydroxides.the solubility of alkaline
earth metal oxides in water increases as we move from top to bottom in a group.which of
the following alkaline earth metal oxides is least soluble in water?
a.MgO
b.CaO
c.BaO
d.SrO
66.the electronic structure of carbon monoxide is represented as:

d
67.Which one pair has the same oxidation state of ‘Fe’?
a.FeSO4 and FeCl3
b.FeCl2 and FeCl3
c.FeSO4 and FeCl3
d.Fe2(SO4)3 and FeSO4
68.Oxidation state of ‘Fe’ in K2[Fe(CN)6] is:
a.-3
b.-5
c.+3
d.+2
69.The nature of an aqeous solution of ammonia (NH3) is:
a.amphoteric
b.neutral
c.acidic
d.basic
70.Unpolluted rain water has a pH of:
a.4.9
b.5.6
c.5.3
d.7.0
71.In comparison with oxygen gas,a strong triple bond is present between two nitrogen
atoms in a molecule and therefore nitrogen gas is:
a.highly reactive gas
b.completely inert like noble gases
c.moderately reactive gas
d.very less reactive gas
72.The catalyst used in the Haber’s process is:
a.Magnesium oxide
b.Aluminium oxide
c.silicon oxide
d.iron crystals with metal oxide promoters
73. The cis-isomerism is shown by:
74.Select the nucleophile from the following examples:
a.NO2
b.NH3
c.NO2+
d.NH4+
75.The introduction of an alkyl group in benzene takes place in the presence of AlCl3 and:
76.What is the product formed when propene reacts with HBr?
a.CH3-CH2-CH2Br
b.CH3-CH(Br)-CH3
c.(Br)CH2-CH(BR)-CH3
d.Br(CH2)-Ch=CHBr
77.The order of reactivity of alkyl halides towards nucleophile is:
a.RI>RBr>RF>RCl
b.RI>RBr>RCl>RF
c.RF>RCl>RBr>RI
78.Consider the reaction given below:
Which statement is true?
a.Reagent for I is KOH in alcohol
b.Reagent for II is KOH in aqueous medium
c.Reaction I is debromination
d.Reaction II is elimination
79.Consider the following reaction:
C2H5OH+PCl5–?
What product(s) may be formed?
a.C2H5Cl only.
b.C2H5Cl and HCl.
c.C2H5Cl,POCl3 and HCl
d.C2H5Cl and POCl3
80.
. is named as:
a.Picric acid
b.Nitro phenol
c.benzoic acid
d.Malonic acid
81.Aqueous phenol decolourizes bromine water to form a white precipitate.what is the
structure of the white precipitate formed?
82.The relative strength of carboxylic acid,water,ethanol and phenol ha sthe following
order of increasing acid strength:
a.Carboxylic acid>phenol>ethanol>water
b.Carboxylic acid>phenol>water>ethanol
c.Phenol>carboxylic acid>ethanol>water
d.Water>ethanol>phenol>carboxylic acid
83.Which of the following is the structure of ketone?
84.What is the structure of alcohol which on oxidation with acidified Na2Cr2O7 gives

85.Which group gives a yellow precipitate of triiodomethane when warmed with alkaline
aqeous iodine?
a.Methyl ketone group
b.ethyl ketone group C2H5-C(O)-
c.a primary alcohol group as in propanol,CH3-CH2-CH2-OH
d.an amide group CH3-C(O)-NH2
86.CH3-C(O)-OH+NH3 +heat?
The final products formed are:
a.CH3-C(O)-NH2+CO2
b.CH3-C(O)-NH2+H2O
c.CH3-C(O)-NH2+H2
d.CH3-C(O)-NH2+HCl
87.Methyl cyanides,on boiling with mineral acids or alkalies yield:
a.acetic acid
b.formic acid
c.propanoic acid
d.butanoic acid
88.The formation of ester from acetic acid in presence of acid and ethanol is a:
a.nucleophilic substitution reaction
b.nucleophilic substitution reaction
c.electrophilic substitution reaction
d.electrophilic addition reaction
89.what is the name of amino acid,NH2-CH(R)-COOH where ‘R’ is CH2 group?
a.glycine
b.alanine
c.lysine
d.aspartic acid
90.a-amino acids are compounds having carboxylic acid as well as amino functional
groups attached to:
a.same carbon atom
b.alternate carbon atoms
c.neighbouring carbon atoms
d.any H-atom in the molecule
91.The formation of ‘zwitterion’ is represented by:
a.+NH2-CH(R)-CO2-
b.+NH4-CH(R)-CO2-
c.+NH3-CH(R)-COd.+
NH2-CH(R)-COO-
92.Two or more amino acids condensed to form protein by a peptide linkage which is
present between two atoms:
a.C and C
b.O and C
c.C and N
d.C and H
93.The amino acids which largely exist in dipolar ionic form are:
a.acidic amino acids
b.basic amino acids
c.alpha amino acids
d.beta amino acids
94.The reaction:
95.Polyvinyl acetate is colourless and non-toxic resin used as an adhesive and as a
binder for making:
a.toys
b.gramophone recorders
c.emulsion paints
d.compact discs
96.Both ribose and deoxiribose are monosachrides containing___________carbon
atoms.
a.four
b.five
c.six
d.seven
97.The increased quantities of cholesterol in blood make plaque like deposits in the
arteries causing:
a.cholera
b.Down’s syndrome
c.heart attack
d.phenylketonuria
98.Polyvinyl chloride is an example of:
a.condensation polymer
b.addition polymer
c.biopolymer
d.thermosetting polymer
99.collagen is a fibrous protein present most abundantly in:
a.hair
b.nail
c.tendons
d.arteries
100.animals store glucose in the form of glycogen in:
a.stomach
b.mouth
c.liver and muscles
d.small intestine
101.The in photochemical smog is due to the presence of:
a.SO2(sulphur dioxide)
b.NO2(nitrogen dioxide)
c.CO(carbon monoxide)
d.CO2(carbon dioxide)
102.Aerobic decomposition of organic matter i.e. glucose by bacteria in water sediments
produces:
a.propene
b.ethane
c.methane
d.butane

Answer Key :

 

 

mcat 2013 key

MCAT 2013 paper Chemistry (6) MCAT 2013 paper Chemistry 2 MCAT 2013 paper Chemistry 3 MCAT 2013 paper Chemistry 4 MCAT 2013 paper Chemistry 5 MCAT 2013 paper Chemistry 6 MCAT 2013 paper Chemistry 7 MCAT 2013 paper Chemistry 8 MCAT 2013 paper Chemistry 9 MCAT 2013 paper Chemistry 10

 

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