WorksheetsIs Matter Around us Pure?
Total questions: 25
Worksheet time: 11mins
When a saturated solution is heated and more solute is dissolved in it, what is such a solution called?
Supersaturated Solution
Colloidal Solution
Aqueous Solution
Thermo Saturated Solution
Immiscible liquids separate out into layers depending on their
Volumes
Weights
Masses
Densities
_____________ was the first scientist to coin the term element in _____.
Robert Boyle, 1683
Antoine Lavoisier , 1661
Robert Boyle, 1661
Antoine Robert Lavoisier, 1743
By which process can we separate cream from milk?
Centrifugation
Chromatography
Promation
Filtration
Which method do we use to separate two miscible liquids?
Centrifugation
Evaporation
Distillation
Separating Funnel
A compound can have variable composition.
False
Wrong Question
Sometimes
True
A sample contains two substances and has uniform properties. The sample is ________?
A compound.
A heterogeneous mixture.
An element.
A homogeneous mixture.
A mixture will appear translucent in the case of?
Copper sulphate + water.
Alum + water.
Sugar + water.
Starch + water.
Which of the following is an example of heterogeneous substance?
Bottled water.
Table salt.
Pieces of copper.
Candle.
Which of the following is an example of homogeneous substance?
Granite.
Copper sulphate.
m&m candy.
Muddy water.
Two chemical species X and Y combine together to form a product P which contains both X and Y
X + Y → P
X and Y cannot be broken down into simpler substances by simple chemical
reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compound
(iii) X and Y are elements
(iv) P has a fixed composition
(a) (i), (ii) and (iii),
(b) (i), (ii) and (iv)
(c) (ii), (iii) and (iv)
(d) (i), (iii) and (iv)
The amount of solute present per unit volume or per unit mass of the solution/solvent is known as
(a) Composition of solute
(b) Concentration of a solvent
(c) Concentration of a solute
(d) Concentration of a solution
What is the solute in the soda water?
Water
Carbon dioxide
Sugar
Oxygen
how will you seperate oxygen from a mixture of liquid air?
centrifugation
seperating funnel
fractional distillation
distillation
Tyndall effect is observed in forests because of
tress
high oxygen level
mist and dust particles in the air
less sunlight
Rusting of an article made up of iron is called
(a) corrosion and it is a physical as well as chemical change
(b) dissolution and it is a physical change
(c) corrosion and it is a chemical change
(d) dissolution and it is a chemical change
Two substances, A and B were made to react to form a third substance,
A2B according to the following reaction
2 A + B → A2 B
Which of the following statements concerning this reaction are incorrect?
(i) The product A2B shows the properties of substances A and B
(ii) The product will always have a fixed composition
(iii) The product so formed cannot be classified as a compound
(iv) The product so formed is an element
(a) (i), (ii) and (iii),
(b) (ii), (iii) and (iv)
(c) (i), (iii) and (iv)
(d) (ii), (iii) and (iv)
When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles stay at the top. This principle is used in:
(a) Centrifugation
(b) Fractional distillation
(c) Evaporation
(d) Tunneling
If we put camphor in an open container, its amount keeps on decreasing due to the phenomenon of
(a) Evaporation
(b) Precipitation
(c) Condensation
(d) Sublimation
Which of the following elements is not a metalloid?
(a) Boron
(b) Silicon
(c) Germanium
(d) Tungsten
Which of the following non-metal is a good conductor of electricity?
(a) Aluminium
(b) Silicon
(c) Graphite
(d) Gold
Brass is an alloy. It is a mixture of______
30% Zinc 70% copper
20% copper 80% nickel
40% iron 80% copper
35% gold 65% zinc
How will you separate the components of sugar solution
evaporation
crystallization
filtration
chromatography
Tyndall effect is observed in both suspensions and colloids.
True
Never
Sometimes
False
What is the dispersion phase and medium of milk?
Liquid and Solid,
Solid and Liquid
liquid and liquid
gas and solid
