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
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behaves as electrolytes
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remains undissociated
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behaves as non electrolytes
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does not conduct electricity
A
Correct answer
Explanation
A salt is an electrovalent compound, made up of a positive ion other than a hydrogen ion (H+) and a negative ion, other than a hydroxyl ion (OH-). When dissolved in water, it dissociates into free mobile ions. Such salts thus behave as electrolytes. They can be strong or weak electrolytes depending on the degree of dissociation.
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It increases.
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It decreases.
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It remains the same.
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It first decreases, then increases.
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It first increases, then decreases.
B
Correct answer
Explanation
When a liquid or gas is heated it, it expands on heating, i.e its length, area and volume increases. Hence, its density decreases.
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Thermal expansion
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Thermal swelling
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Thermal enlargement
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All of the above
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None of these
A
Correct answer
Explanation
The property by virtue of which solids increase in size on heating is called thermal expansion.
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pure compound
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mixture
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element
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suspension
B
Correct answer
Explanation
According to chemical point of view, air is a mixture of various gases, water vapor and dust.
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subscript
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superscript
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atomic number
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none of these
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transparent
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luminous
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translucent
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opaque
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none of these
C
Correct answer
Explanation
Yes, it is the correct answer. Paper is an opaque objec, but if oil is spilled on it, it becomes translucent. It is because partial light can now pass through it.
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water
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diesel
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petrol
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kerosene
D
Correct answer
Explanation
Sodium is kept in kerosene.
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Endothermic change
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Physical change
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Natural change
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Fast change
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Reversible change
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freezing
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condensation
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sublimation
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evaporation
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deposition
E
Correct answer
Explanation
It is the process of converting gas directly into solid.
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Melting of ice cream
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Melting of metals
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Burning sugar
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Baking bread
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Evaporation of water
C
Correct answer
Explanation
An exothermic change in which heat is released.
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They form a tight bond.
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They move apart from each other.
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Some have tight bond and some move apart from each other.
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They get packed close together.
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They move very far from each other.
B
Correct answer
Explanation
When solid changes into liquid, molecules move apart from each other.
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Production of charcoal
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Dissolving salt in water
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Boiling of water
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Melting of ice
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Melting wax
A
Correct answer
Explanation
Charcoal is obtained by heating of wood, sugar, etc. in the absence of oxygen, which cannot be reversed.
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Steel
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Diamond
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Air
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Soil
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Ocean water
B
Correct answer
Explanation
Yes, it is a pure substance. It is made up of only one component that is carbon.
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Solute
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Homogeneous
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Solvent
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Heterogeneous
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Screen
B
Correct answer
Explanation
It is a mixture in which the composition is uniform.
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Mixture of alcohol and water
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Blood
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Sand
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Wine
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Hard alcohol
C
Correct answer
Explanation
Yes, it is an example of a heterogeneous mixture. A heterogeneous mixture is made of different substances that remain physically separate. Heterogeneous mixtures always have more than one phase.