Chemistry · Science General
States of Matter
2,682 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
A
Correct answer
Explanation
Both boiling and evaporation involve a phase change from liquid to gas. Boiling occurs throughout the liquid at a specific temperature, while evaporation occurs at the surface at various temperatures.
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It happens when water gains heat.
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It happens when water loses heat.
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Freezing point of pure water is 100°C.
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It changes from solid state to liquid state.
B
Correct answer
Explanation
Freezing is the process where liquid water loses heat and changes to solid ice at 0°C for pure water. Water gains heat during melting, not freezing. Freezing changes liquid to solid, not solid to liquid.
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It freezes into ice.
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It condenses into water droplets.
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It boils.
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It melts.
B
Correct answer
Explanation
When warm water vapor comes into contact with a cold surface, it loses heat energy. This causes the gas to transition back into a liquid state, a process known as condensation.
B
Correct answer
Explanation
Freezing is an exothermic process (heat loss), and evaporation is a process that requires energy input from the surroundings (heat gain). Since freezing is heat loss, the statement is false.
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melting
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boiling
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evaporation
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freezing
A
Correct answer
Explanation
Melting is the phase transition where a substance changes from a solid state to a liquid state by absorbing heat.
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Ice
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Water vapour
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Mist
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Wind
C
Correct answer
Explanation
Mist is formed when water vapor in the air cools down and condenses into tiny liquid water droplets suspended in the air.
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melting
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condensation
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freezing
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boiling
B
Correct answer
Explanation
Condensation is the process where a substance in a gaseous state changes into a liquid state, typically when cooled.
B
Correct answer
Explanation
An iceberg is made of solid water (ice). When it melts, it transitions from a solid state to a liquid state.
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condensation
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boiling
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evaporation
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melting
B
Correct answer
Explanation
Boiling is the rapid phase transition from liquid to gas that occurs specifically at the boiling point (100 degrees Celsius for water at sea level).
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expands
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contracts
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solidifies
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condenses
A
Correct answer
Explanation
Thermal expansion is a common property of matter. When heated, particles gain kinetic energy and move further apart, causing the material to expand.
A
Correct answer
Explanation
Ice is the solid form of water, where molecules are locked into a rigid crystalline structure.
D
Correct answer
Explanation
Plasma is a state of matter consisting of a gas-like mixture of free electrons and positive ions.
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Freezing
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deposition
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evaporation
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condensation
C
Correct answer
Explanation
Evaporation is an endothermic process, meaning it requires an input of thermal energy to overcome the intermolecular forces holding the liquid molecules together.
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freezing
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boiling
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melting
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mass
C
Correct answer
Explanation
The melting point is the specific temperature at which a solid transitions into a liquid state.
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more slowly
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more quickly
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in the same way
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more quickly and farther
A
Correct answer
Explanation
Particles in a solid have lower kinetic energy and are restricted to vibrating in fixed positions, whereas gas particles move rapidly and freely.