Chemistry · Science General
States of Matter
2,382 Questions
States of matter questions explore physical changes, evaporation, phase transitions, and the properties of liquids and gases. Topics cover density, cryosurgery, heavy water, and electrolytes. This foundational chemistry topic frequently appears in general science sections of SSC and railway exams.
Phase change mechanismsEvaporation and temperature effectsProperties of liquidsPhysical versus chemical changesElectrolytes and heavy water
States of Matter Questions
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Melting
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Vaporisation
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Condensation
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Sublimation
D
Correct answer
Explanation
Dry ice is converted into gas directly at room temperature by a process called sublimation.
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Freezing
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Cooling
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Melting
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Boiling
C
Correct answer
Explanation
Heat energy is provided during melting that transforms into potential energy.
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The force of attraction remains unchanged.
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The force of attraction increases.
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The force of attraction decreases.
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The force of attraction first increases and then decreases.
C
Correct answer
Explanation
During evaporation, the force of attraction between the particles of a liquid decreases and the liquid is converted into gas.
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Water
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Dry ice
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Copper
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Alcohol
B
Correct answer
Explanation
Only dry ice is a gas at room temperature.
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Melting
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Boiling
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Sublimation
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Vapourisation
C
Correct answer
Explanation
Only sublimation can occur in absence of heat. For example, dry ice sublimes at room temperature.
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Weak forces of attraction between molecules
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Vibration of particles about their mean position
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Arrangement of particles in a definite manner
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Absence of space between particles
A
Correct answer
Explanation
Water does not have definite shape due to weak forces of attraction between its molecules.
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Gel
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Water
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Carbon dioxide
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Glass
C
Correct answer
Explanation
Carbon dioxide (gas) has the weakest intermolecular forces between its particles.
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Mercury
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Methane
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Milk
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Marble
B
Correct answer
Explanation
Methane is a gas. Therefore, it does not have definite shape and volume.
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It is a rapid process.
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It takes place at the surface of a liquid.
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It takes place at definite temperature.
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It converts liquid into vapour.
B
Correct answer
Explanation
Boiling occurs throughout the mass of a liquid.
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It occurs at all temperatures.
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It is a fast process.
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It occurs throughout the water body.
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It heats the surroundings.
A
Correct answer
Explanation
Evaporation occurs at all temperatures. It occurs at the surface, and is a slow process.
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Solid --------> Gas
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Liquid ---------> Gas
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Gas ---------> liquid
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Gas --------> Solid
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Liquid ---------> Solid
B
Correct answer
Explanation
This is the correct answer as during the process of boiling water, which is liquid gets converted in to water vapours, which is a gas.
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A sea containing derivatives of only hydrocarbons
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A sea containing molecules of organic substances
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A sea of simple compounds
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A sea of minerals
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A sea of simple hydrocarbons
B
Correct answer
Explanation
A sea containing organic substances, which on polymerisation can give rise to biomolecules, was termed as hot dilute soup.
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increases
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decreases
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first increases then decreases
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does not change
B
Correct answer
Explanation
When a liquid is heated, its molecules gain kinetic energy and move farther apart on average, causing the volume to increase while mass stays constant. Since density equals mass divided by volume, increasing volume decreases density.
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It contracts
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It expands
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It first contracts and then expands
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It first expands and then contracts
C
Correct answer
Explanation
Water reaches its maximum density at 4°C. When cooled from 7°C, it first contracts (7°C to 4°C) as it becomes denser, then expands (4°C to 1°C) as the hydrogen bonds form an open hexagonal structure - a unique property known as anomalous expansion.
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the glass gets heated up
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the glass is brittle
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the inner surface of the glass becomes hot and expands but outer surface does not get heated quickly
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none of these
C
Correct answer
Explanation
When boiling water is poured into a glass, the inner surface heats up rapidly and tries to expand. The outer surface remains cooler and doesn't expand at the same rate, creating thermal stress that can crack the glass. This is called thermal shock.