Class 9 Chemistry Chapter 2 MCQ. We covered all the Class 9 Chemistry Chapter 2 MCQ in this post for free so that you can practice well for the exam.
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MCQ on Chemistry Chapter 2 for Class 9 Students
Oil and water can form a stable dispersion with the help of a third substance commonly called
(a) emulsifier
(b) dispersant
(c) protective colloid
(d) None of these
Option a – emulsifier
An atom is
(a) The smallest particle of matter known
(b) The smallest particle of a gas
(c) The smallest indivisible particle of an element that can take part in a chemical change
(d) Radioactive emission
Option c – The smallest indivisible particle of an element that can take part in a chemical change
Which of the following is a compound?
(a) Stainless steel
(b) Brass
(c) Iron sulphide
(d) Diamond
Option c – Iron sulphide
Select the one that has a definite boiling point
(a) true solution
(b) compound
(c) colloid
(d) All of these
Option b – compound
We can see the particles of a colloidal solution with
(a) naked eyes
(b) the help of an ultramicroscope
(c) the help of a microscope
(d) None of these
Option c – the help of a microscope
Which of the following will yield a mixture?
(a) Crushing of marble tile
(b) Breaking of ice-cubes
(c) Addition of sodium metal to water in a china dish
(d) Agitating a detergent with water in a washing machine.
Option d – Agitating a detergent with water in a washing machine
On passing through a colloidal solution, the beam of light gets ……
(a) reflected
(b) refracted
(c) scattered
(d) absorbed
Option c – scattered
The cause of the Brownian movement is
(a) convection current
(b) heat changes in a liquid state
(c) impact of molecules of dispersion medium on colloidal particles.
(d) attractive forces between particles of the dispersed phase and the dispersion medium.
Option c – impact of molecules of dispersion medium on colloidal particles
Brass is an example of
(a) compound
(b) element
(c) homogeneous mixture
(d) heterogeneous mixture
Option c – homogeneous mixture
Air is regarded as a mixture because
(a) its pressure may vary
(b) its temperature may vary
(c) its volume changes with temperature/ change in pressure
(d) its composition may vary
Option d – its composition may vary
Which of the following statements is true for pure substances? (i) Pure substances contain only one kind of particle (ii) Pure substances may be compounds or mixtures (iii) Pure substances have the same composition throughout (iv) Pure substances can be exemplified by all elements other than nickel
(a) (i) and (ii)
(b) (i) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iii)
Option b – (i) and (iii)
When a gas is compressed while keeping the temperature constant, it results in
(a) an increase in the speed of gaseous molecules
(b) an increase in a collision among gaseous molecules
(c) a decrease in the speed of gaseous molecules
(d) a decrease in collision among gaseous molecules
Option b – an increase in a collision among gaseous molecules
Which of the following is an element?
(a) Marble
(b) Graphite
(c) Washing stone
(d) Stone
Option b – Graphite
The one, in which interparticle forces are strongest, is
(a) sodium chloride
(b) hydrogen
(c) ether
(d) carbon dioxide
Option a – sodium chloride
The melting point temperature of the solid state of a substance is 40°C. The freezing point temperature of the liquid state of the same substance will be
(a) 35°C
(b) 40°C
(c) 45°C
(d) can’t predict
Option b – 40°C
Which one will help to accelerate the process of evaporation of a liquid kept in an open china dish?
(a) Keeping the dish open
(b) Blowing air into the liquid
(c) Keeping the dish under a running fan
(d) All of the above
Option d – All of the above
The blue color of water in the sea is due to
(a) absorption of another color except for blue by water molecules
(b) scattering of blue light by sol particles
(c) refraction of blue light by impurities present in seawater
(d) reflection of blue sky by seawater
Option b – scattering of blue light by sol particles
Tails of comets are visible due to
(a) Tyndall Effect
(b) Reflection
(c) Brownian movement
(d) None of these
Option a – Tyndall Effect
Why is helium preferred over hydrogen for use in airships?
(a) Helium has a low density
(b) Helium has a high density
(c) Helium is chemically less reactive
(d) Helium is chemically more reactive
Option c – Helium is chemically less reactive
Which one of the following mixtures is homogeneous?
(a) Starch and sugar
(b) Methanol and water
(c) Graphite and charcoal
(d) Calcium carbonate and calcium bicarbonate
Option b – Methanol and water
During summer, water kept in an earthen pot becomes cool because of the phenomenon of
(a) diffusion
(b) transpiration
(c) osmosis
(d) evaporation
Option d – evaporation
A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement?
(a) Water, air, wind
(b) Air, sugar, oil
(c) Oxygen, water, sugar
(d) Salt, juice, air
Option c – Oxygen, water, sugar
The boiling points of diethyl ether, acetone, and n-butyl alcohol are 35°C, 56°C, and 118°C respectively. Which one of the following correctly represents their boiling points in the kelvin scale?
(a) 306 K, 329 K, 391 K
(b) 308 K, 329 K, 392 K
(c) 308 K, 329 K, 391 K
(d) 329 K, 392 K, 308 K
Option c – 308 K, 329 K, 391 K
In which of the following conditions, the distance between the molecules of hydrogen gas would increase? (i) Increasing pressure on hydrogen contained in a closed container (ii) Some hydrogen gas leaking out of the container (iii) Increasing the volume of the container of hydrogen gas (iv) Adding more hydrogen gas to the container without increasing the volume of the container
(a) (i) and (iii)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Option c – (ii) and (iii)
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