Revision Grade 8..Chem

Inter-particle space between gases is ____________

• Least

• Large

• Very large

Conversion of vapor into liquid

• Sublimation

• Melting

• Liquefaction

• Solidification

Burning of magnesium is a ________ change.

• Reversible

• Irreversible

• Slow

• Periodic

_________ is a chemical change.

• Fermentation

• Freezing

• Rain cycle

• Melting of wax

____________ have low melting and boiling points.

• Metallic elements

• Noble gases

• Metalloids

• Non-metallic elements

Sedimentation is used for separation of ___________.

• Insoluble solid from liquid component

• Soluble gas component from insoluble gas component

• Immiscible lighter liquid from immiscible heavier liquid

Filtration technique is used for ________ mixtures.

• Solid-solid

• Liquid-liquid

• Solid-liquid

___________ is an example of a monoatomic element.

• Nitrogen

• Phosphorous

• Magnesium

___________ is an example of a divalent element/radical.

• Aluminum

• Bisulphite

• Sulphur

• Fluorine

The valency of chlorine in MgCl₂ is __________

• -3

• -2

• -1

• +1