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Modern Periodic Law

The physical ...

Question

The physical property of a substance can be measured without changing its chemical composition. Identify such a physical property from the options.

A

Density

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B

Flammability

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C

Conductivity

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D

Reactivity

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Solution

The correct options are
A Density
C Conductivity
Physical properties are those which can be observed or measured without changing the composition of matter. They are used to observe and describe matter. Texture, colour, odour, melting point, boiling point, density, solubility, polarity, conductivity, ductility, malleability, lustre, sonority, etc. are some examples of physical properties.

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Q. The physical property of a substance can be measured without changing its chemical composition. Which of the following are physical properties?

Q. Assertion :Physical change of a substance involves change in all properties and composition of its molecules Reason: The change of a substance with alteration of composition of its molecules without any change in its specific property is called physical change

Q. Assertion :A physical property can be identified without bringing any chemical changes. Reason: Chemical changes takes place through chemical reactions.

Q. Matter undergoes a change. The changes are of two types: Physical and chemical change.

A physical change is a change that involves only a change in the physical state of matter. Its chemical properties remain the same. Usually increasing the temperature or applying pressure or both bring about a physical change. On reversing the condition, that is reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible.

A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.

In a chemical change, the properties that change are :

Q. Assertion: Tearing of paper is a physical change, although it cannot be reversed.
Reason: Chemical change is a reaction involving the change in chemical properties or composition, resulting in the formation of a new substance.

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