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MDCAT Chemistry Chapter 2 Atomic Structure Online Test MCQs With Answers
Question # 1
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 # 2
5604 cm3 of H2 gas at STP contains atoms of hydrogen
Choose an answer
6.02×10 (23)
2.6x10(22)
3.01x10(23)
1. 50x 10(23)
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Question # 3
250cm of 0.2 molar potassium sulphate solution is mixed with 250cm of 0.2 molar KCI solution. The molar concentration of K ions is:
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0.2 molar
0.25 molar
0.3 molar
0.35 molar
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Question # 4
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 # 5
Number of moles present in 0.6 gram of silica is (Atomic mass Si = 28, O=16)
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0.01 mole
0.064 mole
0.044 mole
0.054 mole
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Question # 6
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 # 7
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 # 8
Number of H+ ions when 0.1 mole of sulfuric acid is completely ionized in water
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4x6.022x10ê23
1×6.022x10ê23
2x6.022 x10ê23
2x6.022x10ê22
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Question # 9
6Na+ Fe2O3 -------- 3 Na2O+2Fe For above reaction, if you are provided with 230g Na and 320g Fe2O3, then limiting reactant is
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, Na
Na2O
Fe2O3
none of these
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Question # 10
What s the boling point of H2O at the peak of Mount Everest?
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101 C°
69°C
100 C°
98° C
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Question # 11
In s solution 7.8 g of benzene ( C6H6 ) and 46g of toluene (C6H5CH3) is present. The mole fraction of toluene is
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1/3
1/5
2/3
5/6
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Question # 12
During combustion analysis, which one is used for absorbing carbon dioxide:
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50% KOH
5% KOH
Mg(ClO4)2
Silica gel
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Question # 13
Which of the following compound have empirical formula, but no molecular formula
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H20
C6H6
H
2
O
2
NaCl
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Question # 14
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 # 15
How many isotopes are present in palladium
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Two
Four
Six
nine
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Question # 16
Point out that which is not an application of liquid crystals?
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Source of energy
In display of electrical devices
For skin thermography
As temperature sensor
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Question # 17
The hydrocarbon with maximum B.P is
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CH4
C6H14
C4H10
C2H6
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Question # 18
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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Question # 19
Gram atoms of hydrogen in 5.5 g H2
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5.50
2.25
5.45
2.20
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Question # 20
Naturally occurring isotopes of silver are
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,Two
, Four
, Forty seven
, sixteen
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