Past paper 2015 of MCAT by KIPS.Chemistry portion is added.MCQs are very important for medical entry test.
62
Which one of the following will have the
smallest radius?
MCAT 2015 past paper
MCAT
45
‘Ka’ values of few organic acids are
given.
|
Acid
|
Ka
|
|
CH3COOH
|
1.85×10–5
|
|
CCl3COOH
|
2.3×10–2
|
|
CHCl2COOH
|
5.0×10–3
|
|
CH2ClCOOH
|
1.3×10–3
|
The order of the acid strength is
A) CCl3COOH
> CHCl2COOH > CH2ClCOOH > CH3COOH
B) CH3COOH > CHCl2COOH
> CCl3COOH > CH2ClCOOH
C) CHCl2COOH > CH3COOH
> CCl3COOH > CH2ClCOOH
D) CCl3COOH > CH3COOH
> CHCl2COOH > CH2ClCOOH
46
An organic acid ‘z’ reacts separately
with sodium bicarbonate, sodium hydroxide and sodium carbonate. Which one of
the following represent the structure of ‘z’
A) HCOOC2H5 C)
CH3CH2OH
B) CH3 – CH = CH2 D) H3C
– CH2 – COOH
47
Carboxylic acids are rather hard to
reduce, which powerful reducing agent can be used to convert them to the
corresponding primary alcohol
A) H2SO4 /
HgSO4 C)
LiAlH4
B) V2O5 D)
K2Cr2O7/H2SO4
56
If the volume of a gas collected at a
temperature of 60°C and pressure of 1.05×105 Nm-2 is 60dm3
what would be the volume of gas at STP (P = 1.01×103Nm–2,
T = 273K)?
A) 25cm3 C)
100cm3
B) 75cm3 D)
51cm3
57
There are four orbitals s, p, d and f.
Which order is correct with respect to the increasing energy of the orbitals
A) 4s < 4p
< 4d < 4f C)
4s < 4f < 4p < 4d
B) 4p < 4s < 4f < 4d D) 4f
< 4s < 4d < 4p
58
Which one of the following pairs has the
same electronic configuration as possessed by neon (Ne-10)
A) Na+, Cl– C)
Na+, Mg+
B) K+,Cl– D)
Na+, F–
60
The half life of N2O5
at°C is 24 minutes. How long will it take for sample of N2O5
to decay to 25% of its original concentration?
A) 24 minutes C)
120 minutes
B) 72 minutes D)
48 minutes
61
When the change in concentration is 6×10–4
moldm-3 and time for that change is 10 seconds, the rate of reaction
will be
A) 6×10–3 moldm–3
sec–1 C) 6×10–2 moldm–3sec–1
B)
6×10–4 moldm–3 sec–1 D) 6×10–5 moldm–3sec–1
62
Which one of the following will have the
smallest radius?
A) Al+3 C)
Mg+2
B) Si+4 D)
Na+1
63
Keeping in view the size of atoms, which
order is correct?
A) N > C C)
Ar > Cl
B) P > Si D)
Li > Be
64
68
About 80% of ammonia is used for the
production of
A) Explosives C)
Nylon
B) Fertilizers D)
polymers
69
Urea is the most widely used nitrogen
fertillzer in Pakistan. Its composition is
A) NH2CO C)
N2H4CO2
B) N2H5CO2 D)
N2H4CO
70 e
D) Reaction must be carried out
at high temperature
71
What is the percentage of nitrogen in NH3NO3?
A) 65% C) 20%
B) 35% D)
58%
72 Order of reactivity of alkenes with
hydrogen halide is
A) HBr > HI > HCl C) HF
> HI > HCl
B) HI > HBr > HF D)
HI > HBr > HCl
75
In the above reaction, the configuration of the
product is
A) 100% same of the configuration
of reactant
B) 50% retained
C) 50% inverted
D) 100% opposite
from configuration of reactant
78
Which one of the following was used as
one of the earliest antiseptic and disinfectant?
A) Phenol C)
Ethanol
B) Ether D) Methanol
79
Which one of the following is NOT able
to denature the ethanol?
A) Methanol C)
Pyridine
B) Lactic acid D)
Acetone
80
How will you distinguish between
methanol and ethanol?
A) By lucas test C)
By oxidation
B) By silver mirror test D) By
iodoform test
81
To produce absolute alcohol (100%) from
rectified spirit (95.6% alcohol), the remaining 4.4% water must be removed by a
drying agent such as
A) Calcium oxide C)
Calcium carbonate
B) Calcium chloride D) Carbon
monoxide
82
Which one of the following is also
called silver mirror test
A) Fehling’s solution test C) Tollen’s
reagent
B) Iodoform test D)
Benedict’s solution tests
83
86
The specific substance (metabolite) that
fits on the enzyme surface and is converted to products is called
A) Co-factor C)
Isoenzyme
B) Prosthetic group D)
Substrate
87
Polymide is formed due to the
condensation of hexane-dioic acid with
A) Hexane–1,5–diamine C)
Hexane–1,4–diamine
B)
Hexane–1,6–diamine D)
Hexane–2,5–diamine
88
Haemoglobin is a
A) Genetic protein C)
Transport protein
B) Building protein D)
Structural protein
8
You can get all past papers of MCAT on Android by installing this app.
90
Out of these which nitrogen base is NOT
present in DNA?
A) Adenine C)
Uracil
B) Guanine D)
Thymine
91
Which one of the following is an example
of co-polymer?
A) Polyamide C)
Polyvinyl acetate
B) Polystyrene D)
Polyvinyl chloride
92
The biggest source of acid rain is the
oxides of
A) N C) O
B) S D)
C
93
Burning of which one of the following
waste is considered as useful industrial fuel or to produced electricity
A) Metals C) Paper
B) Grass D)
Plastic
94
96
Standard enthalpy of combustion of
graphite at 25°C is –393.51 kJmol–1 and that of diamond is –395.41
kJmol–1. The enthalpy change for graphite is
A) –1.91 C) –2.1
B) +2.1 D)
+1.91
97
10.0 grams of glucose are dissolved in
water to make 100 cm3 of its solution, its molarity is
A) 0.55 C)
10
B) 0.1 D) 1
98
Given solution contains 16.0 g of CH3OH,
92.0g of C2H5OH and 36g of water. Which statement about
mole fraction of the components is true?
A) Mole fraction of CH3OH
is highest among all components
B) Mole fraction
of C2H5OH and H2O is the same
C) Mole fraction of CH3OH
and C2H5OH is the same
D) Mole fraction of H2O
is the lowest among all
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