Chemistry Class 12th Chapter Two MCQ
Q.1 Which is independent of temperature ?
(A) Molarity
(B) Formality
(C) Normality
(D) Morality
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Q.2 The molality of pure water is ____
(A) 18
(B) 55.5
(C) 60.5
(D) 16
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Q.3 Molarity of 900 of water is ____
(A) 50 M
(B) 55.5 M
(C) 5 M
(D) 200 M
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Q.4 The atmospheric pollution is generally measured in the units of ____
(A) Mass percentage
(B) Volume percentage
(C) Volume fraction
(D) PPM
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Q.5 234.2 gm of sugar syrup contains 34.2 gm of sugar. What is the molal concentration of the solution.
(A) 0.1
(B) 0.5
(C) 5.5
(D) 55
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Q.6 Atomic mass is equal to ___
(A) Number of electrons of an atom
(B)Sum of the numbers of electrons and protons of an atom
(C) Numbers of neutrons and protons of an atom
(D) None of these
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Q.7 The law which indicates the relation’-hip between solubility of a gas in liquid and pressure is ____
(A) Raoult’s law
(B) Henry’s law
(C) Lowering of vapour pressure
(D) Van’t Hoff law
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Q.8 Which of the following units is useful in relating concentration of solution with its vapour pressure ?
(A) Mole fraction
(B) Parts per million
(C) Mass percentage
(D) Molality
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Q.9 The number of moles of NaCl in 3 litres of 3M solution is _____
(A) 1
(B) 3
(C) 9
(D) 27
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Q.10 The value of Henry’s constant KH is _________ .
(A) Greater for gases with higher solubility.
(B) Greater for gases with lower solubility.
(C) Constant for all gases.
(D) Not related to the solubility of gases.
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Q.11 Which of the following is incorrect for an ideal solution ?
(A) ∆Hmix =0
(B) ∆Vmix = 0
(C) ∆P = Pobs – Pcalculated = 0
(D) ∆Gmix = 0
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Q.13 Which has the highest freezing point ?
(A) 1 M glucose
(B) 1 M NaCl
(C) 1 M CaCl2
(D) 1 M AlF3
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Q.14 Which has the lowest boiling point at 1 atm pressure ?
(A) 0.1 M KCl
(B) 0.1 M Urea
(C) 0.1 M CaCl2
(D) 0.1 M A1Cl3
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Q.15 People add sodium chloride to water while boiling eggs. This is to ____
(A) Decrease the boiling point
(B) Increase the boiling point
(C) Prevent the breaking of eggs
(D) Make eggs tasty
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