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Chemistry M.C.Q (1 Marks)

Solutions · CBSE STD 12 Science (CBSE - English Medium). 34 questions.

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M.C.Q (1 Marks)

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34 questions · auto-graded multiple-choice test.

MCQ 11 Mark
The compound with maximum value of van't Hoff factor (i) for complete dissociation of solute in aqueous solution is ;
  • A
    KCl
  • B
    NaCl
  • ✓
    $K _2 SO _4$
  • D
    $MgSO _4$
Answer
Correct option: C.
$K _2 SO _4$
(C) $K _2 SO _4$
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MCQ 21 Mark
Which of the following solutions of KCl will have the highest value of molar conductivity?
  • A
    $0,01 M$
  • ✓
    1 M
  • C
    0.5 M
  • D
    0.1 M
Answer
Correct option: B.
1 M
(B) 1 M
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MCQ 31 Mark
The boiling point of an atomic mixture of two liquids when it :
  • A
    shows negative deviation from Raout's law
  • B
    forms an ideal solution
  • ✓
    shows positive deviation from Racult's law
  • D
    is saturated
Answer
Correct option: C.
shows positive deviation from Racult's law
(C) shows positive deviation from Racult's law
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MCQ 41 Mark
Which medium of expression of concentration is independent of temperature?
  • A
    Molarity
  • B
    Normality
  • C
    Formality
  • ✓
    Molality
Answer
Correct option: D.
Molality
(D) Molality
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MCQ 51 Mark
If a solution of $5 \%$ glucose (molecular weight 180) and a solution of $10 \%$ unknown substance are isosmotic at the same temperature then the molecular weight of unknown substance is:
  • A
    90
  • B
    180
  • ✓
    360
  • D
    45
Answer
Correct option: C.
360
(C) 360
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MCQ 61 Mark
Which of the following pairs of liquid is governed by Racult's law?
  • A
    Water-bydrogen acid
  • ✓
    Benzenc-methanol
  • C
    Water-nitric acid
  • D
    Acetone-chloroform
Answer
Correct option: B.
Benzenc-methanol
(B) Benzenc-methanol
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MCQ 71 Mark
The value of freczing point of an aquecus solution is $0.186^{\circ} C$, the corresponding solution's boiling point is $\left( K _{ f }=1.86^{\circ} C mol ^{-1} kg\right)\left( K _{ b }=0.512^{\circ} C \right.$ $\left.mol ^{-1} kg\right):$
  • A
    $0.186^{\circ} C$
  • ✓
    $0.0512^{\circ} C$
  • C
    $1.86^{\circ} C$
  • D
    $5.12^{\circ} C$
Answer
Correct option: B.
$0.0512^{\circ} C$
(B) $0.0512^{\circ} C$
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MCQ 81 Mark
What will be the molarity of 450 ml solution of 5 gm NaOH ?
  • A
    $0.189 mol dm ^{-3}$
  • ✓
    $0.278 mol dm ^{-3}$
  • C
    $0.556 mol dm ^{-3}$
  • D
    $0.027 mol dm ^{-3}$
Answer
Correct option: B.
$0.278 mol dm ^{-3}$
(B) $0.278 mol dm ^{-3}$
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MCQ 91 Mark
Semipermeable membrane allows :
  • A
    a solution to pass through
  • B
    a solute to pass through
  • ✓
    the solvent to pass through
  • D
    both solute and solvent to pass through
Answer
Correct option: C.
the solvent to pass through
(C) the solvent to pass through
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MCQ 101 Mark
The elevation in boiling point of an aqueous solution of urea is $0.52^{\circ}\left[ K _{ b }=0.52^{\circ} C mol ^{-1}\right]$. So what will be the mole fraction of urea in this?
  • A
    0.982
  • B
    0.567
  • C
    0.943
  • ✓
    0.018
Answer
Correct option: D.
0.018
(D) 0.018
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MCQ 111 Mark
When the electrolyte dissociates in the solution, then what will be the value of its van't Hoff factor?
  • ✓
    $>1$
  • B
    $<1$
  • C
    1
  • D
    Zero
Answer
Correct option: A.
$>1$
(A) $>1$
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MCQ 121 Mark
The ratio of freezing point depression of aqucous solution of $0.1 M KCl , 0.1 M CaSO _4$ and 0.1 M $K _2 CO _3$ will be :
  • A
    $1: 1: 3$
  • B
    $2: 2: 5$
  • ✓
    $1: 1: 1.5$
  • D
    $1: 1: 1$
Answer
Correct option: C.
$1: 1: 1.5$
(C) $1: 1: 1.5$
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MCQ 131 Mark
Which of the following is a molecular property?
  • A
    Surface tension
  • B
    Viscosity
  • ✓
    Osmotic pressure
  • D
    Conductivity
Answer
Correct option: C.
Osmotic pressure
(C) Osmotic pressure
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MCQ 141 Mark
Soda water is :
  • A
    Solution of water in $CO _2$ gas
  • ✓
    Solution of $CO _2$ gas in water
  • C
    Solution of $CO _2$ and $O _2$
  • D
    Solution of $CO _2^2$ and $N _2$
Answer
Correct option: B.
Solution of $CO _2$ gas in water
(B) Solution of $CO _2$ gas in water
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MCQ 151 Mark
Which of the following condition is true for an ideal solution?
  • A
    $\Delta H _{\text {mixtare }}>0$
  • B
    $\Delta S _{\text {mixture }}<0$
  • C
    $\Delta G _{\text {mixtare }}>0$
  • ✓
    $\Delta V _{\text {mixture }}=0$
Answer
Correct option: D.
$\Delta V _{\text {mixture }}=0$
(D) $\Delta V _{\text {mixture }}=0$
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MCQ 161 Mark
In which of the following mixtures dipole-dipole attraction is mainly found?
  • A
    KCl and $H _2 O$
  • B
    $C _6 H _6$ and $CCl _4$
  • C
    $C _6 H _6$ and $C _2 H _5 OH$
  • ✓
    Image
Answer
Correct option: D.
Image
(D)
Image
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MCQ 171 Mark
What will be a one molar solution of $H _2 SO _4$ be similiar to?
  • A
    Normal solution
  • B
    $N / 2$ solution
  • ✓
    2 N solution
  • D
    4 N solution
Answer
Correct option: C.
2 N solution
(C) 2 N solution
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MCQ 181 Mark
Which of the following pairs does not form an ideal solution?
  • A
    $C _2 H _5 Br , C _2 H _5 I$
  • ✓
    $C _2 H _5, C _2 H _5 OH$
  • C
    $C _6 H _5 CL , C _6 H _5 Br$
  • D
    $C _6 H _6 . C _6 H _3 CH _3$
Answer
Correct option: B.
$C _2 H _5, C _2 H _5 OH$
(B) $C _2 H _5, C _2 H _5 OH$
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MCQ 191 Mark
The misture of benzene and toluene is :
  • A
    Solution with positive deviation
  • B
    Solution with negative deviation
  • ✓
    Ideal solution
  • D
    Non-ideal solution
Answer
Correct option: C.
Ideal solution
(C) Ideal solution
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MCQ 201 Mark
Which of the following properties is not a molecular property?
  • A
    Boiling point elevation
  • B
    Vapour pressure depression
  • C
    Freczing point depression
  • ✓
    Freezing point
Answer
Correct option: D.
Freezing point
(D) Freezing point
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MCQ 211 Mark
Which of the following will have the highest boiling point at one atmospheric pressure?
  • A
    0.1 M glucose
  • B
    0.1 M urea
  • ✓
    0.1 M barium chloride
  • D
    0.1 M NaCl
Answer
Correct option: C.
0.1 M barium chloride
(C) 0.1 M barium chloride
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MCQ 221 Mark
The solution of two liquids which is distilled at a constant temperature without change in composition is called :
  • A
    saturated solution
  • B
    ideal solution
  • ✓
    steady state mixture
  • D
    unsaturated solution
Answer
Correct option: C.
steady state mixture
(C) steady state mixture
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MCQ 231 Mark
Solutions with equal osmotic pressure are called :
  • A
    hypertonic solution
  • B
    hypotonic solution
  • ✓
    isomotic solution
  • D
    normal osmotic solution
Answer
Correct option: C.
isomotic solution
(C) isomotic solution
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MCQ 241 Mark
The pressure used to stop the process of osmosis is called :
  • A
    Vapour pressure
  • B
    Partial pressure
  • ✓
    Osmotic pressure
  • D
    Atmospheric pressure
Answer
Correct option: C.
Osmotic pressure
(C) Osmotic pressure
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MCQ 251 Mark
The following number of moles of solute present per kilogram of solvent is called :
  • A
    Molarity
  • B
    Normality
  • ✓
    Molality
  • D
    Mole fraction
Answer
Correct option: C.
Molality
(C) Molality
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MCQ 261 Mark
The osmotic pressure of the fluid present in blood cells is equal to which of the following?
  • A
    $1 \%(w / V ) NaCl$ solution
  • ✓
    $0.9 \%(w / V) NaCl$ solution
  • C
    $1 \%(w / V) Na _2 SO _4$ solution
  • D
    None of the above
Answer
Correct option: B.
$0.9 \%(w / V) NaCl$ solution
(B) $0.9 \%(w / V) NaCl$ solution
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MCQ 271 Mark
What is the semipermeable membrane used for reverse osmosis made of?
  • A
    Cellophane
  • B
    Pig's bladder
  • ✓
    Cellulose acetate
  • D
    Parchment
Answer
Correct option: C.
Cellulose acetate
(C) Cellulose acetate
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MCQ 301 Mark
For which of the following the value of van't Hoff factor will be equal to the van't Hoff factor for $K _4\left[ Fe ( CN )_6\right]$ :
  • A
    NaCl
  • B
    $Na _2 SO _4$
  • ✓
    $Al _2\left( SO _4\right)_3$
  • D
    $Al \left( NO _3\right)_3$
Answer
Correct option: C.
$Al _2\left( SO _4\right)_3$
(C) $Al _2\left( SO _4\right)_3$
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MCQ 311 Mark
Which formula is not correct for van't Hoff factor?
  • A
    $i=\frac{\Delta T _{ b } \text { (observed) }}{\left.\Delta T _{ b } \text { (calculated }\right)}$
  • B
    $i=\frac{\Pi \text { (observed) }}{\Pi \text { (calculated) }}$
  • C
    $i=\frac{\Delta T _{ f } \text { (observed) }}{\Delta T _{ f } \text { (calculated) }}$
  • ✓
    $i=\frac{\text { Observed molecular weight }}{\text { Calculated molecular weight }}$
Answer
Correct option: D.
$i=\frac{\text { Observed molecular weight }}{\text { Calculated molecular weight }}$
(D)$i=\frac{\text { Observed molecular weight }}{\text { Calculated molecular weight }}$
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MCQ 321 Mark
Which of the following solutions will have minimum osmotic pressure?
  • A
    $0.1 M BaCl _2$
  • ✓
    0.1 M Urea
  • C
    0.1 M HCl
  • D
    0.2 M glucose
Answer
Correct option: B.
0.1 M Urea
(B) 0.1 M Urea
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MCQ 331 Mark
In which of the following units the concentration of solution does not depend on temperature?
  • A
    Molarity
  • B
    Normality
  • C
    Formality
  • ✓
    Molality
Answer
Correct option: D.
Molality
(D) Molality
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MCQ 341 Mark
If 2 g NaOH is mixed in 250 gram of water, then the concentration of the solution will be:
  • A
    0.2 M
  • B
    0.2 N
  • ✓
    0.2 m
  • D
    4 gram litre$^{ -1}$
Answer
Correct option: C.
0.2 m
(C) 0.2 m
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M.C.Q (1 Marks) - Chemistry STD 12 Science Questions - Vidyadip