CBSE Questions for Class 9 Chemistry Is Matter Around Us Pure Quiz 12 - MCQExams.com

Fractional distillation is used to separate liquids having an appreciable difference in their ______.
  • size and shape
  • solubility
  • boiling points
  • none of these
A heterogeneous mixture has a uniform composition throughout the mixture. 
  • True
  • False
Matter that contains two or more constituent substances, combined in definite proportion is called______
  • mixture
  • compound
  • element
  • metalloid
Milk is an example of ______
  • solution
  • homogeneous mixture
  • heterogeneous mixture
  • suspension
State whether the following statements are true or false.
The substance in which a solute dissolves is called a solvent.
  • True
  • False
Which is distilled first?
  • Liquid $$H_{2}$$
  • Liquid $$CO_{2}$$
  • Liquid $$O_{2}$$
  • Liquid $$N_{2}$$
The mixture of oil and water is :
  • homogenous mixture
  • heterogenous mixture
  • pure mixture
  • none of above
Which of the following is not a substance?
  • Water
  • Smoke
  • Vision
  • Dust
Air is:
  • a pure substance
  • a mixture
  • a compound
  • an element
A mixture consists of a soluble solid in a liquid. which method is most suitable for separating both the components?
  • Sedimentation
  • Winnowing
  • Distillation
  • Handpicking
Which among the following is a homogeneous system but is not a compound?
  • Common salt
  • Oil
  • Milk
  • Salt in water
Which of the following is a heterogeneous mixture ?
  • Air
  • Rain
  • Steel
  • Soil
Which of the following is not heterogeneous? 
  • Jelly
  • Milk
  • Steel
  • Smoke
Which of the following mixtures cannot be separated by using a separating funnel? 
  • Kerosene oil and water
  • Ethyl alcohol and water
  • Turpentine oil and water
  • Benzene and water
Four alternatives are given to each of the following incomplete statements questions.
Choose the right answer. 
Which of the following is not a pure substance 
  • Common salt
  • sugar
  • Rain water
  • Iron
Which of the following is the universal solvent?
  • Water
  • Petrol
  • Benzene
  • Alcohol
Which of the following method used to separate two immiscible liquids?
  • Separation funnel
  • Sieving
  • Winnowing
  • Sublimation
Which method is commonly used to separate salt from water?
  • Sedimentation
  • Filteration
  • Evaporation
  • Condensation
True or False?
A mixture of milk and water can be separated by filtration.
  • True
  • False
Method for separating drugs (medicine) which are miscible in blood
  • Distillation
  • Sublimation
  • Using separating funnel
  • Chromatography
Which out of the following is not a homogeneous mixture?
  • Air
  • Brass
  • Solution of sugar in water
  • Smoke
Petrol is a homogeneous mixture of a number of hydrocarbons.
  • True
  • False
A mixture of water and acetone is being separated using the apparatus shown. Where will the separated acetone get collected?
1955965_85ea192b62d54622b1f49bf09cf5beb5.png
  • Q
  • P
  • S
  • R
Which of the following is a true solution?
  • Sugar solution
  • Milk
  • Blood
  • Ink
  • None of these
Study the given flowchart carefully and identify P and Q respectively.

315707.png
  • Compress and cool; Nitrogen
  • Expand and heat; Argon
  • Compress and heat; Oxygen
  • Expand and cool; Oxygen
Which kind of substance contain particles of only one kind ?
  • Pure substance
  • Impure substance
  • Alloy
  • Metalloid
Which of the following are properties of sols?
  • Adsorption
  • Tyndall effect
  • Flocculation
  • Paramagnetism
Ethyl alcohol is completely miscible with water. It can be separated from this mixture by:
  • Using a separate funnel
  • Evapouration
  • Fractional distillation
  • Allowing the water to evaporate
Liquids which do not mix with each other are :
  • Solution
  • Miscible
  • Immiscible
  • All of these
  • None of these
If the ammonia gas is dissolved in the liquid which is going to be distilled, then after completion of distillation where it will be?
480832_4d73be85daae430e97cf465f92d220d3.png
  • Around the thermometer
  • In the condenser
  • In the distillate
  • In the circulating water
  • In the heated flask
Homogeneous mixtures are also called :
  • colloids
  • elements
  • true solutions
  • compound
  • none of these
The disease kalaazar is cured by:
  • colloidal antimony
  • milk of magnesia
  • argyrols
  • colloidal gold
  • colloidal silver
Chromatography is a word that means "colour writing". It is a technique that can be used to separate the components of a mixture.
In this experiment, a marker was used to make a dot of green ink on a piece of paper. The bottom edge of the paper was placed in water and the water travelled vertically up the paper. As a result, the spot of green ink was separated into two colors: blue and yellow.
Which of the following is the best explanation for the fact that the blue ink moved farther up the paper than the yellow ink in this experiment?
  • The density of blue ink is greater than the density of yellow ink.
  • Blue ink is more soluble in water than yellow ink is.
  • Blue ink has a smaller molar mass than yellow ink.
  • Molecules of blue ink are smaller in size than molecules of yellow ink.
Choose the correct answer form the alternatives given.
A student by chance mixed acetone with alcohol. This mixture of acetone and alcohol can be separated by
  • Filtration
  • Separating funnel
  • Fractional crystallisation
  • Fractional distillation
The copper sulphate solution during crystallization is filtered to:   
  • separate copper
  • form crystals
  • separate impurities
  • All of the above
The colloidal solutions of gold prepared by different methods have different colours. This is due to:
  • Difference in size of colloidal particles
  • Different concentration of gold
  • Presence of different types of foreign particles
  • The variable valency of gold
What do you call a mixture where two substances are mixed in uniform composition?
  • Aerosol
  • Colloid
  • Suspension
  • None of the above
The suitable method is to separate the following components of the mixtures.
A) Two volatile liquids with appreciable differences in boiling points.
B) Two or more colored constituents soluble in some solvent.
  • A - Fractional distillation, B - decantation
  • A - Simple distillation, B - Evaporation
  • A - Simple distillation, B - Chromatography
  • A - Sublimation, B - Chromatography
  • A - Sublimation, B - Simple distillation
Which of the following is made up of atoms of two different elements?
  • Ozone
  • Water
  • Glucose
  • Sulphuric acid
If a chemical is given to you, how would you know that it is pure?
  • By checking its melting point
  • By observing its colour
  • By testing
  • By smelling it
Petrol and water can be separated by ............ because................
  • fractional distillation, they are immiscible liquids
  • simple distillation, their boiling points slightly differ.
  • separating funnel, they are immiscible liquids.
  • None of these
Homogeneous mixture is formed by mixing:
  • acetone and water
  • iron filing and water
  • silver chloride and water
  • ethanol and water
Smoke is an example of 
  • gas dispersed in liquid.
  • gas dispersed in solid.
  • solid dispersed in gas.
  • solid dispersed in liquid.
Mixture of $$MgCO_{3}$$ & $$NaHCO_{3}$$ on strong heating gives $$CO_{2}$$ & $$H_{2}O$$ in $$3 : 1$$ mole ratio. The weight $$\%$$ of $$NaHCO_{3}$$ present in the mixture is :
  • $$33.33\%$$
  • $$66.66\%$$
  • $$48.6\%$$
  • $$50\%$$
A mixture of mustard oil and water forms 
  • a Compound
  • a Homogeneous mixture
  • an Alloy
  • a Heterogeneous mixture
The pH of a sample of $$H_{2}SO_{4}$$ is 1.The percentage of the solution is $$73.5\%$$ (W/W), the density of the solution is
  • $$2.66\times10^{-3} g/cc$$
  • $$5.32\times10^{-3} g/cc$$
  • $$1.33\times10^{-3} g/cc$$
  • $$0.01 g/cc$$
Potassium hydroxide solution is used to absorb $${ CO }_{ 2 }$$. How many litres of $${ CO }_{ 2 }$$ at 1.00 atm and $${ 22 }^{ \circ  }C$$ would be absorbed by an aqueous solution containing 15.0 g of KOH?

$$2KOH+{ CO }_{ 2 }\rightarrow { K }_{ 2 }{ CO }_{ 3 }+{ H }_{ 2 }O$$
  • 3.24 L
  • 1.62 L
  • 6.48 L
  • 0.324 L
Choose the incorrect option
  • $$CHC{I_3}$$ and $$CC{I_4}$$ can be separated by fractional distillation
  • Acetone and benzene can be separated by fractional distillation
  • Aniline is separated from a mixture of aniline and water by the method of steam distillation
  • Glycerol cannot be separated from spent-lye in soap industries by distillation under reduce pressure.
Which of the following will form negatively charged colloidal solution ?
  • 100 ml 0.1 M AgNO$$_{3}$$ + 100ml 0.1 M KI
  • 100 ml 0.2 M AgNO$$_{3}$$ + 100ml 0.1 MKI
  • 100ml 0.1 MAgNO$$_{3}$$ + 100ml 0.2 M KI
  • 100ml 0.2 M AgNO$$_{3}$$ + 200 ml 0.1 M KI
Egg albumin is :
  • Reversible colloid
  • Lyophilic colloid
  • Protective colloid
  • All
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