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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
In esterification, the OH of carboxylic acid is replaced by
Choose an answer
OR+
R+
OR
R
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Question # 2
The hexagonal closed packing is associated with
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Ag, Cu, Au
Zn, Cd, Hg
Li, Na, K
NaCl, KBr
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Question # 3
Which is the following would have most like an ideal gas at room temperature?
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carbon dioxide
helium
hydrogen
nitrogen
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Question # 4
Coinage metals Cu. Ag, and Au are the least reactive because they have
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Negative reduction potential
Positive reduction potential
Negative oxidation potential
Positive oxidation potential
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Question # 5
The mono atomic gases are
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Halogens
Noble gases
6h group elements
Nitrogen and oxygen
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Question # 6
Theoretically, the temperature at which volume of gas become equal to zero is called
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Boiling point of water
Zero absolute
Zero Kelvin
both B and C
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Question # 7
Which of the following statements is false?
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Avogadro number = 6.02 x 10
21
The relationship between average velocity (v) and root mean square velocity (u) is v = 0.9213 u
The mean kinetic energy of an ideal gas is independent of the pressure of the gas
The root mean square velocity of the gas can be calculated by the formula (3RT/M)
1/2
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Question # 8
Which compound is not formed as a result of reaction between acetic acid & HI & red phosphorous
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Ethanol
Water
lodine
Ethane
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Question # 9
The carbon atom of an alkyl group attached with halogen atom is called
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Electrophile
Free redical
Nucleophile
Nucleophilic centre
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Question # 10
Which ion is most polarising?
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AI
3+
Ba
2+
Mg
2+
Na
+
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Question # 11
The temperature below which a gas does not exist is called its
Choose an answer
Inversion temperature
Critical temperature
Neutral temperature
Curie point
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Question # 12
The amount of energy released when gaseous ions of opposite charges combine to give one mole of a crystalline ionic compound is called
Choose an answer
bond energy
heat of formation
lattice energy
ionization energy
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Question # 13
The element which shows highest binding energy
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V
T
So
Cr
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Question # 14
Which of the following is not an electrophilic substitutional reaction of benzene?
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Free radical chlorination of benzene
Friedel Craft alkylation
Sulphonation
Nitration
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Question # 15
consider the physical properties of the gases. Which of the following statements about particles of gases is incorrect? The particles are:
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causing pressure
having wide spaces
orderly arranged
randomly moving
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Question # 16
The structural isomerism arises due to the difference in the
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Number of atoms in the molecule
Arrangements of atoms in the molecule
Number as well as arrangement of atoms in the molecule
Spatial arrangement of atoms
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Question # 17
An example of ion-dipole force is solution of
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NaCl in water
Glucose in water
Bromine in benzene
Ethanol in water
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Question # 18
In which of the following processes the liquids are made to boil at low temperature
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Vacuum distillation
Destructive distillation
Distillation
Vacuum destructive distillation
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Question # 19
Higher the surface area available for reaction
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slower the reaction
faster the reaction
constant the reaction
lower the Ea
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Question # 20
The solubility product of AgCl is
2.0 x 10(-10) mol2 dm(-6). The maximum concentration Ag+ ions in the solution is:
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1.41 × 10(-5) mol. dm(-3)
1.41 × 10(-10) mol. dm(-3)
2.0 × 10(-10) mol. dm(-3)
4.0 × 10(-20) mol. dm(-3)
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Question # 21
Covalent bonds are
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directional
Bidirectional
Multidirectional
Non directional
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Question # 22
The relationship between volume of a given amount of gas and prevailing conditions of temperature and pressure are:
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Charle's law
Graham's law
Boyle's law
Gas laws
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Question # 23
Energy of atom in compound is
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Higher than individual atom
Lower than individual atom
equal to individual atom
Impossible to predict
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Question # 24
Which one of the following is not true of metallic bonding?
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it gives rise to excellent electrical conductivity
electrons are following to move throughout the structure
the strength of metallic bonds increases down a group
the strength of metallic bonding affects the boiling point of metals
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Question # 25
The factor responsible for lower mercury level in a capillary tube is
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High density
Surface tension
Liquid state
Metallic Colour
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Question # 26
H
2
effuses through a porous pot at a rate of 500 cm
3
per minute at 0
°C.The rate of diffusion of O
2
through the same vessel at 0
°C per minute is
Choose an answer
500 cm
3
250 cm
3
1 dm
3
125 cm
3
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Question # 27
For the reaction H2(g) +I2 (g) <---------> 2Hl(g). The equilibrium constant changes with
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Total pressure
Catalyst
Concentration of H2 and I2
Temperature
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Question # 28
The attractive forces which exist between ionic compounds and water molecules are
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dipole-dipole forces
ion diopole forces
istantaneous dipole-induced dipole forces
dipole-induced dipole forces
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Question # 29
Mostly ionic compounds are produced between elements of group
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IA and IIA
IB and VIB
IA. IIA and VII-A
IA and IB
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Question # 30
The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disapp-ears.The behaviour is a characteristic of substance forming
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Allotropic crystal
Liquid crystals
Isomeric crystals
Isomorphous crystals
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Question # 31
Which of the following belongs to alkaline earth metals
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Cu
Zn
Sn
Mg
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Question # 32
The critical temperature of NH
3
is greater than CO
2
due to its:
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Greater polarity
Stable polarity
Lesser polarity
None of above
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Question # 33
Acording to the kinetic theory of gases
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The pressure exerted by a gas is proportional to mean square velocity of the molecules
The pressure exerted by the gas is proportional to the root mean square velocity of the molecules
The root mean square velocity is inversely proportional to the temperature
The mean translational KE of the molecule is directly proportional to the absolute temperature
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Question # 34
Lonic solids are characterized by:
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low melting points
good conductivety in solid state
high vapour pressures
solubility in polar solvents
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Question # 35
The pressure exerted by the vapours in equilibrium with its pure liquid at given temperature is called the
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equilibrium pressure
atmospheric pressure
vapour pressure
external pressure
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Question # 36
Inside every fluorescent lamp there is present a:
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Gas
Plasma
Liquid
Solid
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Question # 37
At what temperature, would N
2
molecules have the same average speed as He-molecules at 300 k?
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1100 K
2100 K
420 K
None
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Question # 38
At higher temperature what is true for gases
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pressure is decreased
volume is decreased
number of moles are decreased
KE is increased
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Question # 39
In voltaic cell a saht bridge is used in order to
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Pass the electric current
Prevent the flow of ions
Mix solutions of two half cells
Allow movement of' ions between two cells
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Question # 40
Triple point of water is
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273 K
373 K
203 K
193 K
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Question # 41
The number of NaCI molecules in unit cell of its crystal is
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2
4
6
8
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Question # 42
The no. of Ip's on oxygen in CO are
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1
3
4
2
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