Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion: Elements and compounds are pure substances.
Reason: Properties of compounds are different from those of its constituent elements.
Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion : Cream can be separated from curd by centrifugation.
Reason : In centrifugation, immiscible liquids separate out in layers depending on their densities.
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Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion : Burning a match stick is a physical change.
Reason : Chemical changes are irreversible changes whereby the chemical composition also changes and a new substance is formed.
Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion : When a beam of light is passed through a colloidal solution placed in a dark place the path of the beam becomes visible.
Reason : Light gets scattered by the colloidal particles
Assertion (A): A suspension is a heterogeneous mixture in which solute particles do not dissolve but remain suspended in the medium.
Reason (R): Particles of a suspension are too small to be seen with the naked eye.
Assertion (A): A solution containing less solute than the saturation level is called an unsaturated solution.
Reason (R): An unsaturated solution can dissolve more solute until it reaches the saturation point.
Assertion (A): A compound is a form of matter that cannot be broken down by chemical reactions into simpler substances.
Reason (R): A compound is a substance composed of two or more different types of elements, chemically combined in a fixed proportion.
Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion : A solution of table salt in a glass of water is homogeneous.
Reason : A solution having different composition throughout is homogeneous.
Assertion (A): Lemonade is an example of a homogeneous mixture.
Reason (R): In a solution, there is homogeneity at the particle level, where the solute particles are evenly distributed in the solvent.
Assertion (A): Alloys are considered as mixtures, even though their components cannot be separated by physical methods.
Reason (R): Alloys show the properties of their constituents and can have variable composition.