Chemistry MCQs For MCAT

Chemistry MCQs For MCAT

1- isotopes are sister atoms of same element with similar chemical properties but different
(a) atomic number
(b)atomic volume
(c)atomic mass
(d)atomic structure

2-cadmium has isotopes
a-3
b-6

c-9
d-12

3-atomic masses of elements were determined by
a-john Dalton
b-Berzelius
c-Avogadro
d-Democritus

4-what is the mass of one mole of Iodine molecule.

a-53
b-74
c-250
d-254

5-in combustion analysis CO2 is absorbed in
a-mg(ClO4)2
b-lime water
c-concentrated H2SO
d-50%KOH

6-the collection of Avogadro no of [articles represent
a-molecule
b-empirical formula
c-formula unit
d-mole

7-CO+ is an example of

a-free radical
b-cationic molecular ion
c-stable molecule
d-anionic molecular ion

8-which of the following has the max num of moles
a-1g of H2O
B-40g of H2O
C-36g of H2O
d- none

9-%of O2 in H2O is
a-80%
b-88.8%
c-70%
d-none

1-which of the following has the least critical temperature
a-NH3
b-H2O
c-O2
4-CO2

2-kinetic energy of 3 moles of a gas is
a-3RT
b-RT/2

c-2RT
d-3/2RT

3-the value of gas constant depends upon
a-temp
b-volume
c-no of moles
d-units of volume and pressure

4-at which temp, the hydrogen will have same kinetic energy as nitrogen molecules at 280K/
a-280K
B-400K
C-40K
D-50K

5-the root mean square velocity of an ideal gas at constant pressure varies with demsity as
a-d^2
b-d
c-(d)^1/2
d-1/(d)^1/2

6-which of the following deviates more from the ideal gas behaviour?
a-HCL
B-CH4
C-He
d-N2

7-oxygen gas contained in a flask at S.T.P was replaced by SO2under same conditions . the weight of S02 will be
a-equal to O2
b-half of O
c-twice that of O2
d-thrice that of O2

8-which of the following molecules have max root mean square velocity at 25 degree
a-CO2
B-H2S
C-NH3
D-SO2

1-which of the following has the least critical temperature
a-NH3
b-H2O
c-O2
4-CO2

2-kinetic energy of 3 moles of a gas is
a-3RT
b-RT/2

c-2RT
d-3/2RT

3-the value of gas constant depends upon
a-temp
b-volume
c-no of moles
d-units of volume and pressure

4-at which temp, the hydrogen will have same kinetic energy as nitrogen molecules at 280K/
a-280K
B-400K
C-40K
D-50K

5-the root mean square velocity of an ideal gas at constant pressure varies with demsity as
a-d^2
b-d
c-(d)^1/2
d-1/(d)^1/2

6-which of the following deviates more from the ideal gas behaviour?
a-HCL
B-CH4
C-He
d-N2

7-oxygen gas contained in a flask at S.T.P was replaced by SO2under same conditions . the weight of S02 will be
a-equal to O2
b-half of O
c-twice that of O2
d-thrice that of O2

8-which of the following molecules have max root mean square velocity at 25 degree
a-CO2
B-H2S
C-NH3
D-SO2

1. Which one of the following compounds does not obey Octet rule
a. PF3
b. BF3
c. NF3
d. AsF3

2. Maximum energy is required to remove an electron from
a. s-orbital
b. p-orbitals
c.d-orbitals

d. f-orbitals

3. Among halogens, maximun electron affinity is shown by----
a. Iodine
b. Bromine
c. Chlorine
d. Flourine

4. Bonding maybe 100% ionic when electro-negativity difference is----
a. 0.9
b.1.7
c. 2.4
d. 3.4

5. Ionic bonding is usually formed between the elements of -------- of periodic table
a. Group I and group VII
b. GroupII    and group VII
c. Group I and group VI
d. All of above

6. Which one of the following is a non-polar copmpound.
a. CHCl3
b. CH3OH

c. CCl4
d. CH3Cl

7. How many C0-Ordinate bonds are present in HCLO4.
a. 4
b. 3
c.2
d.1

8. Valence shell electron pair repulsion theory was developed by------
a. Gillespie
b. Sidgwick
c. Powell
d.All of above

1- According to HESSES law,therml effects of a reaction depends upon?

a-initial concentration of reactants
b-initial and final concentrations of reacting substances
c-final conditions of the reacting substances
d-catalyst

2-when ammonium chloride is dissolved in water,the solution becomes cold.the change is?
a-endothermic
b-exothermic

c-super cooling
d-chemical

3-how much heat is liberated when 100ml of 0.1M NaOH are completely neutralized by 100ml of 0.1 MHCl?
a--57kj
c- -5.7kj
d- -6.05kj

4-BORN HEBER cycle is called
a-complete enthalphy cycle
b-complete energy cycle
c-complete internal energy cycle
d-complete heat cycle

5-the atom X nd Y have the electronic configuration shown below
X. 1s2  2s2  2p6 3s2 3p6 3d10 4s2
Y.1s2 2s2 2p4
which of  the following components are they likely to form
a-XY
b-XY2
c-X2Y
d-XY4

6-which of the following moleculeshas zero dipole moment
a-NH3
B- CHCL3
C-H2O

D-BF3
7-ehich of the hydrogen halides has the highest percentage of ionic character
a-HCl
b-HBr
c-HF
d-HI

8-which of the following species has unpaires electrons in antibonding molecular orbital
a-O2-2
b- N2-2
c-B2
d- F2
9-the molecule with largest dipole moment
a-BCl3
b- CO2
c-CO
d-CH4

10-during formation of ionic bond between sodium and chlorine
A- Na attains yhe configuration of Ne
B- Na attains the configuration of Ar
C-Cl attains the configuration of Ne
D- Cl attains the configuration of Na

11-the degree of polarity of molecule is called
A-bond energy
B-dipole moment
C-ionic character
D-coordinate character