Embibe Experts Solutions for Chapter: Physical and Chemical Changes, Exercise 1: Exercise 1

Statement $\mathrm{I}$ Sublimation of ${\mathrm{NH}}_4\mathrm{Cl}$ is a chemical change.

Statement $\mathrm{II}$ Sublimation is a phenomenon in which a solid on heating directly changes into gas without changing to liquid.

Which of the following processes related to physical change?

$\mathrm{I}$. Salt dissolved in water.
$\mathrm{II}$. Dissociation of salt in water.
$\mathrm{III}$. Decomposition of salt by electrolysis.

Codes

Which of the following represent a physical change?

$\mathrm{I}$. Cutting of carrot into pieces.
$\mathrm{II}$. Separation of iron and sulphur from their mixture.
$\mathrm{III}$. Separation of salt from sea-water.

Which of the following processes responsible for chemical change?

$\mathrm{I}$. Electrolysis
$\mathrm{II}$. Sublimation
$\mathrm{III}$. Corrosion
$\mathrm{IV}$. Decomposition

Code

Combustion of a candle is a/an

Which of the following represent both physical and chemical change?

$\mathrm{I}$. Burning of candle.
$\mathrm{II}$. Burning of methane.
$\mathrm{III}$. Decomposition of salt.

Which of the following processes is related to chemical change?

$\mathrm{I}$. Movement of free electrons in copper wire.
$\mathrm{II}$. Electric current passes through copper wire.
$\mathrm{III}$. Electric current passes through $\mathrm{NaCl}$ aqueous solution.

Which of the following represent a chemical change?

$\mathrm{I}$. Magnetisation of iron.
$\mathrm{II}$. Condensation to liquid.
$\mathrm{III}$. Burning of fuel.
$\mathrm{IV}$. Rusting of iron.