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Online Tests
MDCAT Chemistry Chapter 2 Atomic Structure Online Test MCQs With Answers
Question # 1
What s the boling point of H2O at the peak of Mount Everest?
Choose an answer
101 C°
69°C
100 C°
98° C
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Question # 2
The stoichiometric calculations for a chemical reaction results in
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Actual yield
Percentage yield
Theoretical yield
Selectivity
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Question # 3
Glycerine is a polar compound. It boils at 290°C under one atmospheric pressure. It should be distilled under reduced pressure due to reason that
Choose an answer
there are strong intermolecular forces between molecules of glycerine
it decomposes at 290°C
low pressure makes the liquid to boil at high temperature
the reduced pressure decreases the boiing point of liquids
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Question # 4
Which of the following is pure substance
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Distilled water
, Sea water
, NaCl (aq)
Brass
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Question # 5
How many electrons have to be removed to ionize 1.0 x 10(-6) moles of Ne atoms to Ne+ ions in a neon advertising tube:
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6.02x10ê23/1.0x10ê-6
1.0x 10ê-6 x 6.02x 10ê23
1.0x10ê-6 x 6.02×10ê23/20.2
1.0x10ê-6 x 6.02x10ê23/9.65x10ê-1
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Question # 6
Evaporation occurs at all temperatures and is effected by
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surface area
temperature
intermolecular forces
all of these
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Question # 7
The molarity of 2% W/V NaOH solution is
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2
0.25
0.05
0.5
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Question # 8
When we dissolve 15.8 g of KMnO4 in 1000g of H20. The solution is
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, 0.1 M
0.1 M
0.2 M
0.2 M
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Question # 9
If empirical formula of a compound is CH2 and its molecular mass is 56amu. What will beits molecular formula
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CH2
C3H6
C2H4
C4H8
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Question # 10
Molecular ions are produced in mass spectrometer. Which type of molecular ion formed more abundantly.
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Negatively charged
H⁺ ions
Positively charged
equal positive and negative ions
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Question # 11
1 gram molecule refers to amount in grams
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Equivalent to 1 mole of an atom
Equivalent to 1 mole of a molecule
Equivalent to 1 mole of an ionic species
Of an ionic compound
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Question # 12
The hydrocarbon with maximum B.P is
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CH4
C6H14
C4H10
C2H6
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Question # 13
Mass spectrometry is used to determine the
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Number of isotopes of an element
Relative abundance of isotopes
Relative isotopic masses
All of these
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Question # 14
Atoms having same mass number but different atomic numbers are called.
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Isotopes
isobars
Isotones
isomers
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Question # 15
To cook the food at a high mountain is difficult as compared to at sea level. The reason is that:
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the temperature at the top of the mountain is low
the density of water decreases at the mountains
the boiling point of water decreases at the mountain
the hydrogen bonding in water changes with the change of height
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Question # 16
Combustion analysis is performed for the determination of
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Molar mass of the compound
Empirical formula of the compound
Structural formula of the substance
Mass of halogens present in organic compounds
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Question # 17
The B.P of H2O at Murree Hills is
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99.8C
98°C
100C°
89°C
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Question # 18
Which of the following contains I mole of the stated particles
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Chlorine molecules in 35.5 g of chlorine gas
Electrons in 1 g of hydrogen gas
Hydrogen ions in 1 dm³ of 1 mol dm¯³ aqueous sulfuric acid
Oxygen atoms in 22.4 dm³ of oxygen gas at STP
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Question # 19
Styrene has empirical formula CH, and there is 92.2%C and 7.75% hydrogen. If molar mass is 104g mol¯, what will be integral multiple (n) to get molecular formula:
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2
4
6
8
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Question # 20
Cholestryl benzoate tums into milky liquid at
Choose an answer
140°C
145°C
148C°
149°C
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Question # 21
Haemoglobin molecule is how many times heavier than helium atom
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68000 times
17000 times
,34000 times
, 1700 times
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