Chemistry ยท 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
What is the term used to describe the process in which a substance changes from a liquid to a gas and then directly to a solid?
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Deposition
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Condensation
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Sublimation
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Vaporization
A
Correct answer
Explanation
Deposition is the process in which a substance changes from a liquid to a gas and then directly to a solid.
What is the term used to describe the process in which a substance changes from a solid to a gas and then directly to a liquid?
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Sublimation
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Deposition
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Vaporization
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Condensation
A
Correct answer
Explanation
Sublimation is the process in which a substance changes from a solid to a gas and then directly to a liquid.
What is an emulsion and how does it relate to salad dressings?
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A mixture of two immiscible liquids
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A mixture of two miscible liquids
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A mixture of a liquid and a solid
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A mixture of a liquid and a gas
A
Correct answer
Explanation
An emulsion is a mixture of two immiscible liquids, such as oil and vinegar, that are stabilized by an emulsifier. In salad dressings, the emulsifier is typically a protein or a polysaccharide, which helps to keep the oil and vinegar from separating.
What is the term used to describe the temperature at which a polymer transitions from a glassy state to a rubbery state?
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Melting point
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Glass transition temperature
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Boiling point
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Decomposition temperature
B
Correct answer
Explanation
Glass transition temperature (Tg) is the temperature at which a polymer transitions from a glassy state to a rubbery state.
What is the primary component of most paints?
D
Correct answer
Explanation
The binder is the component of paint that holds the pigment particles together and allows the paint to adhere to the surface being painted.
Which of the following is an example of a green solvent?
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Water.
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Dichloromethane.
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Benzene.
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Carbon tetrachloride.
A
Correct answer
Explanation
Water is a green solvent due to its non-toxicity, abundance, and low environmental impact.
The latent heat of fusion of a substance is:
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Amount of heat required to melt 1 gram of a substance
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Amount of heat required to vaporize 1 gram of a substance
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Amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius
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Amount of heat required to lower the temperature of 1 gram of a substance by 1 degree Celsius
A
Correct answer
Explanation
The latent heat of fusion of a substance is defined as the amount of heat required to melt 1 gram of a substance.
What is the main component of gouache paint?
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Oil
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Acrylic resin
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Gum arabic
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Water
C
Correct answer
Explanation
Gouache paint is made from pigments suspended in gum arabic, a natural binder. It is opaque and has a matte finish, making it suitable for both painting and illustration.
What is the primary binder used in watercolor paint?
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Oil
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Acrylic resin
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Gum arabic
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Water
D
Correct answer
Explanation
Watercolor paint is made from pigments suspended in water. This gives it a transparent quality and allows artists to create washes and layers of color.
What is the primary role of water in jam making?
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To add sweetness
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To thicken the jam
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To add color
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To dissolve the sugar
D
Correct answer
Explanation
Water is added to jam to dissolve the sugar and create a syrup. It also helps to extract the pectin from the fruit and prevent the jam from becoming too thick.
What is the process of freezing ice cream called?
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Churning
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Freezing
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Hardening
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Tempering
B
Correct answer
Explanation
The process of freezing ice cream involves rapidly lowering its temperature to prevent the formation of large ice crystals, resulting in a smooth and creamy texture.
What is the critical temperature?
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The temperature at which a gas can no longer be liquefied.
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The temperature at which a liquid can no longer be vaporized.
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The temperature at which a solid can no longer be melted.
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The temperature at which a gas and a liquid can coexist in equilibrium.
D
Correct answer
Explanation
The critical temperature is the temperature at which a gas and a liquid can coexist in equilibrium.
What are some common types of beverage containers?
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Glass bottles
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Plastic bottles
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Metal cans
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Tetra Paks
Correct answer
Explanation
Common types of beverage containers include glass bottles, plastic bottles, metal cans, and Tetra Paks.
According to ancient Greek philosophers, what was the primary substance from which all things were made?
D
Correct answer
Explanation
In ancient Greek philosophy, particularly in the teachings of Empedocles, Earth was considered the primary element or substance from which all things were composed.
What is the isotope effect in superconductivity?
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The critical temperature of a superconductor depends on the mass of its constituent isotopes.
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The isotope effect is not observed in superconductors.
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The isotope effect is only observed in type-I superconductors.
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The isotope effect is only observed in type-II superconductors.
A
Correct answer
Explanation
The isotope effect in superconductivity is the dependence of the critical temperature (Tc) of a superconductor on the mass of its constituent isotopes. The heavier the isotope, the lower the Tc. This effect is explained by the BCS theory of superconductivity, which states that superconductivity is due to the formation of Cooper pairs of electrons. The mass of the isotopes affects the energy of the Cooper pairs, which in turn affects the Tc.