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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Absolute zero
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Latent heat
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Absolute temperature
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Boiling point
A
Correct answer
Explanation
Absolute zero is defined as the theoretical temperature at which the entropy of a perfect crystal is zero and all molecular motion ceases. It is equivalent to 0 Kelvin or -273.15 degrees Celsius.
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Expansion
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Diffusion
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Deposition
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Destruction
B
Correct answer
Explanation
Diffusion is the process of spontaneous movement of particles from an area of higher concentration to an area of lower concentration, resulting in the mixing of substances.
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Only a
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Only a and b
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Only b
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Only b and c
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Only c
C
Correct answer
Explanation
This is the correct option. Convection is not possible in solids because in solids as the molecules are held together in solids by strong inter-molecular forces. As these molecules cannot travel to the source of heat energy, convection is not possible.
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The temperature should be read keeping the line of sight in level of the mercury.
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The bulb of the thermometer should not touch the side or the base of the container.
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The stem of the thermometer should be completely dipped in the liquid.
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The thermometer should be kept upright.
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The bulb of the thermometer should be completely surrounded by the liquid.
C
Correct answer
Explanation
This is the correct option as this is not a precaution that should be observed while reading the laboratory thermometer. One should not dip the stem of the thermometer in the liquid.
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1 and 4
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1, 3 and 5
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2, 3 and 4
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2 and 4
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3, 4 and 5
B
Correct answer
Explanation
Yes, it is the correct answer.
Mass, volume and energy: All are extensive properties
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The body temperature is zero so lit floats like ice.
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The body after death loses its weight.
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The weight of the water displaced by a dead body is more than the weight of dead body.
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None of these
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It will increase
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It will decrease
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It will remain the same
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Will increase nd then decrease
C
Correct answer
Explanation
According to Archimedes' principle, the ice displaces a volume of water equal to its own weight. When the ice melts, it turns into water that occupies exactly the same volume as the water it previously displaced, so the level remains unchanged.
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gel
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foams and froth
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emulsion
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oil water types emulsion
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none of these
A
Correct answer
Explanation
This option is correct because a colloidal system in which dispersed phase is liquid and dispersion medium is solid, is known as gel.
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precipitation
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denaturation
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oxidation
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reduction
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swell
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shrink
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jump
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remain unaffected
A
Correct answer
Explanation
When grapes are placed in distilled water (a hypotonic solution), water enters the cells via osmosis, causing the grapes to swell.
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fat and water
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carbohydrate and water
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carbohydrate, fat and water
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carbohydrate, fat, protein and water
D
Correct answer
Explanation
Milk is a complex mixture containing water, proteins (like casein), fats, carbohydrates (lactose), and various vitamins and minerals.
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Friction
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Lubrication
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Buoyancy
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Liquids
C
Correct answer
Explanation
Darwin proposed the theory of evolution as Archimedes proposed the concept of Buoyancy.
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milk
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vagetable oil
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mist
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foam
C
Correct answer
Explanation
Mist is a colloidal system where liquid droplets are dispersed in a gas (air).
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supersaturated
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unsaturated
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conductor of electricity
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coloured
B
Correct answer
Explanation
The solubility of most solids increases with temperature. Heating a saturated solution of NaCl allows more salt to dissolve, making the solution unsaturated at the higher temperature.
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dissociation
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dissolution
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sublimation
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evaporation
C
Correct answer
Explanation
Sublimation is the phase transition where a substance changes directly from a solid to a gas without passing through the liquid state. Common examples include dry ice and iodine.