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Chemistry M.C.Q (1 Marks)

Solution · Rajasthan Board (RBSE) STD 12 Science (Rajasthan - English Medium). 37 questions.

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M.C.Q (1 Marks)

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37 questions · auto-graded multiple-choice test.

MCQ 11 Mark
Which of the following is a property of ideal solution?
  • ✓
    Obeys Raoult's Law
  • B
    Does not obey Raoult's Law
  • C
    Both (a) and (b)
  • D
    None of the above
Answer
Correct option: A.
Obeys Raoult's Law
A
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MCQ 21 Mark
Azeotropic mixture of HCl and $ H_{2}O $ has:
  • A
    48% HCI
  • B
    36% HCI
  • C
    22.2% HCI
  • ✓
    20.2% HCI
Answer
Correct option: D.
20.2% HCI
D
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MCQ 31 Mark
Which of the following show positive deviation from Raoult's law?
  • ✓
    $ C_{6}H_{6} $ and $ C_{6}H_{5}CH_{3} $
  • B
    $ C_{6}H_{6} $ and $ CCl_{4} $
  • C
    $ CHCl_{3} $ and $ C_{2}H_{5}OH $
  • D
    $ CHCl_{3} $ and $ CH_{3}COCH_{3} $
Answer
Correct option: A.
$ C_{6}H_{6} $ and $ C_{6}H_{5}CH_{3} $
A
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MCQ 41 Mark
Isotonic solutions have the same :
  • A
    Density
  • B
    Normality
  • C
    Strength
  • ✓
    Molar concentration
Answer
Correct option: D.
Molar concentration
D
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MCQ 51 Mark
Which concentration terms is not changed with change in temperature ?
  • A
    Molarity
  • B
    Normality
  • C
    Formality
  • ✓
    Molality
Answer
Correct option: D.
Molality
D
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MCQ 61 Mark
234.2 gm of sugar syrup contains 34.2 gm sugar. What is the molarity of the solution?
  • A
    0.1
  • ✓
    2.0
  • C
    3.0
  • D
    4.0
Answer
Correct option: B.
2.0
B
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MCQ 71 Mark
In comparison to 0.01 M solution of glucose, the depression in freezing point of 0.01 M $ MgCl_{2} $ solution is:
  • A
    Same
  • B
    About twice
  • ✓
    About three times
  • D
    About six times
Answer
Correct option: C.
About three times
C
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MCQ 91 Mark
An osmotic pressure of a solution is represented by:
  • A
    $\pi=\frac{ R c}{T}$
  • ✓
    $\frac{\pi}{c}= RT$
  • C
    $\pi=\frac{c T}{ T }$
  • D
    $\pi=\frac{ RT }{c}$
Answer
Correct option: B.
$\frac{\pi}{c}= RT$
B
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MCQ 101 Mark
Which is a colligative property?
  • A
    Viscosity
  • B
    Surface tension
  • C
    Liquidity
  • ✓
    Osmotic pressure
Answer
Correct option: D.
Osmotic pressure
D
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MCQ 111 Mark
By osmosis semipermeable membrane allow to pass:
  • A
    Solute molecules
  • ✓
    Solvent molecules
  • C
    Complex ions
  • D
    Simple ions
Answer
Correct option: B.
Solvent molecules
B
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MCQ 121 Mark
A 5% solution of cane sugar (mol. wt=342) is isotonic with 1% solution of substance X. The molecular weight of X is:
  • ✓
    68.4
  • B
    34.2
  • C
    171.2
  • D
    136.2
Answer
Correct option: A.
68.4
A
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MCQ 131 Mark
The Van't Hoff factor of 0.1 M $ Ba(NO_{2})_{2} $ solution is 2.74. The degree of dissociation is:
  • A
    91.3%
  • ✓
    87%
  • C
    100%
  • D
    74%
Answer
Correct option: B.
87%
B
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MCQ 141 Mark
Which of the following aqueous solution should have the highest boiling point ?
  • A
    1.0 M NaOH
  • ✓
    1.0 M $ Na_{2}SO_{4} $
  • C
    1.0 M $ NH_{4}NO_{3} $
  • D
    1.0 M $ KNO_{3} $
Answer
Correct option: B.
1.0 M $ Na_{2}SO_{4} $
B
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MCQ 161 Mark
What is the molarity of a solution containing 2 g NaOH in 200 mL:
  • ✓
    0.25
  • B
    0.5
  • C
    5
  • D
    10
Answer
Correct option: A.
0.25
A
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MCQ 171 Mark
The equilibrium constant of a chemical reaction, $ H_{2(g)} + I_{2(g)} = 2HI_{(g)} $ depends on:
  • A
    On full pressure
  • B
    On catalyst
  • ✓
    On quantity of $ H_{2} $ and $ I_{2} $
  • D
    On temperature
Answer
Correct option: C.
On quantity of $ H_{2} $ and $ I_{2} $
C
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MCQ 181 Mark
Avogadro number (N) is:
  • A
    $ 6.023 \times 10^{24} $
  • ✓
    $ 6.023 \times 10^{23} $
  • C
    $ 5.023 \times 10^{-23} $
  • D
    11.2
Answer
Correct option: B.
$ 6.023 \times 10^{23} $
B
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MCQ 201 Mark
18 g of Glucose is dissolved in 178.2 g of water. What will be vapour pressure of water at 100°C in solution?
  • A
    7.60 Torr
  • B
    76.00 Torr
  • ✓
    752.40 Torr
  • D
    79.00 Torr
Answer
Correct option: C.
752.40 Torr
C
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MCQ 211 Mark
3 mol of P and 2 mol of Q are mixed, what will be their total vapour pressure in the solution if their particle vapour pressure are 80 and 60 torr respectively?
  • A
    68 Torr
  • B
    20 Torr
  • C
    140 Torr
  • ✓
    72 Torr
Answer
Correct option: D.
72 Torr
D
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MCQ 221 Mark
In which of the following 0.1 M aqueous solution will have lowest freezing point?
  • ✓
    Potassium sulphate
  • B
    Sodium chloride
  • C
    Urea
  • D
    Glucose
Answer
Correct option: A.
Potassium sulphate
A
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MCQ 231 Mark
A solution of urea (molecular weight is 60 $ g~mol^{-1} $) boiled at $ 100.18^{\circ}C $ temp. and atmospheric pressure. $ K_{f} $ and $ K_{b} $ for the water are 1.86 and 0.512 K kg $ mol^{-1} $ respectively, then how much temp. its freezes?
  • A
    $-6.54°C$
  • ✓
    6.54°C
  • C
    $-0.654°C$
  • D
    0.654°C
Answer
Correct option: B.
6.54°C
B
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MCQ 241 Mark
If the density of HCl is 1.17 g/cc then its molarity will be:
  • A
    36.5
  • B
    18.25
  • ✓
    32.05
  • D
    42.10
Answer
Correct option: C.
32.05
C
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MCQ 251 Mark
The value of colligative properties of a solution increases when solute molecules undergo :
  • A
    Association
  • ✓
    dissociation
  • C
    Both (a) and (b)
  • D
    None of these
Answer
Correct option: B.
dissociation
B
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MCQ 261 Mark
Which of the following is not a colligative properties?
  • A
    Lowering of freezing point
  • B
    Optical activity
  • C
    Lowering of vapour pressure
  • ✓
    Elevation of boiling point
Answer
Correct option: D.
Elevation of boiling point
D
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MCQ 271 Mark
A solution has an osmotic pressure of 0.0821 atm at 300 K. Its concentration would be?
  • A
    0.66M
  • B
    0.32M
  • C
    0.066M
  • ✓
    0.033M
Answer
Correct option: D.
0.033M
D
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MCQ 281 Mark
An aqueous solution freezes at $ -0.186^{\circ}C $. What is the elevation in boiling point?
  • ✓
    0.816
  • B
    0.512
  • C
    0.86
  • D
    0.0512
Answer
Correct option: A.
0.816
A
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MCQ 291 Mark
Mole fraction of a solute in 1 M molal aqueous solution is:
  • A
    1.7700
  • B
    0.1770
  • ✓
    0.0177
  • D
    0.0344
Answer
Correct option: C.
0.0177
C
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MCQ 301 Mark
Which of the following used in radiator of automotive vehicle as antifreeze?
  • ✓
    Glycol
  • B
    Nitrophenol
  • C
    Ethanol
  • D
    Methanol
Answer
Correct option: A.
Glycol
A
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MCQ 311 Mark
12 g of urea is dissolved in 1 litre of water and 68.4 g of sucrose is dissolved in 1 litre of water. The relative lowering in vapour pressure of urea will be :
  • A
    More than sucrose solution
  • B
    Less than sucrose solution
  • C
    Two times than sucrose solution
  • ✓
    Equal times than sucrose solution
Answer
Correct option: D.
Equal times than sucrose solution
D
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MCQ 321 Mark
Aqueous solution of which substance has highest boiling point ?
  • A
    1% Glucose
  • B
    1% Sucrose
  • C
    1% NaCl
  • ✓
    1% $ CaCl_{2} $
Answer
Correct option: D.
1% $ CaCl_{2} $
D
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MCQ 331 Mark
Which one is the best method for determination of molecular weight of proteins and polymers for the solution of colligative properties?
  • ✓
    Osmotic pressure
  • B
    Lowering in vapour pressure
  • C
    Lowering in freezing point
  • D
    Elevation in boiling point
Answer
Correct option: A.
Osmotic pressure
A
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MCQ 341 Mark
A solution contains non-volatile solute of molecular mass $ M_{2} $. Which of the following would be used to calculate the molecular mass of solute in terms of osmotic pressure ?
  • A
    $ M_{2} = (\frac{\omega_{2}}{\pi})VR'T $
  • ✓
    $ M_{2} = (\frac{\omega_{2}}{V})\frac{RT}{\pi} $
  • C
    $ M_{2} = (\frac{w_{2}}{V})\pi RT $
  • D
    $ M_{2} = (\frac{w_{2}}{V})\frac{\pi}{RT} $
Answer
Correct option: B.
$ M_{2} = (\frac{\omega_{2}}{V})\frac{RT}{\pi} $
B
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MCQ 351 Mark
Which of the following hydroxide is insoluble in water?
  • ✓
    $ Be(OH)_{2} $
  • B
    $ Mg(OH)_{2} $
  • C
    $ Ca(OH)_{2} $
  • D
    $ Ba(OH)_{2} $
Answer
Correct option: A.
$ Be(OH)_{2} $
A
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MCQ 361 Mark
A solution containing components A and B follows Raoult's law:
  • A
    Attraction force of A-B is greater than A-A and B-B
  • B
    Attraction force of A-B is equal to A-A and B-B
  • ✓
    Attraction force of A-B is less than A-A and B-B
  • D
    Volume of solution is different from sum of volume of solute and solvent.
Answer
Correct option: C.
Attraction force of A-B is less than A-A and B-B
C
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MCQ 371 Mark
Blood and the solution, in which blood cells remain normal are called:
  • ✓
    Isotonic
  • B
    Hypertonic
  • C
    Equinormal
  • D
    Hypotonic
Answer
Correct option: A.
Isotonic
A
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