Which is the smallest particle of an element ?

• Molecule

• Atom

• Ions

• None of these

Answer explanation

The smallest particle of an element is an atom, making it the correct choice out of the options provided.

What is interparticle sace for solid , liquid and gases ?

• Solid - compartively very large

  Liquid - less more than solids

  Gases - minimum

• Solid - minimum

  Liquid - slightly more than solids

  Gases - compartively very large

Answer explanation

Interparticle space is the space between particles in a substance. In solids, this space is minimum, in liquids it is slightly more than solids, and in gases, it is comparatively very large. Therefore, the correct answer is: Solid - minimum, Liquid - slightly more than solids, Gases - comparatively very large.

What is Melting ?

• the process by which a gases changes to a solid

• the process by which a gases changes to a liquid

• the process by which a liquid changes to a solid

• the process by which a solid changes to a liquid

Answer explanation

Melting is the process by which a solid changes to a liquid, making the correct answer choice: 'the process by which a solid changes to a liquid.'

What happens in Liquefaction ?

• Particles - lose energy

• Inter-particle space - decrease gently

• Inter-particle attraction - increase

• All of these

Answer explanation

All of these - In liquefaction, particles lose energy, inter-particle space decreases gently, and inter-particle attraction increases.

Who was the name of french chemist that introduced about law of conservation of mass ?

Answer explanation

The name of the French chemist who introduced the law of conservation of mass is Antoine Lavoisier.

What is the another name of Liquefaction ?

Answer explanation

The another name of Liquefaction is Condensation.

Energy can neither be _____ nor ______ .

Answer explanation

Energy can neither be created nor destroyed.

Which one is Impure substance ?

• Mixture

• Element

• Compound

Answer explanation

Impure substances are mixtures, which consist of two or more different substances mixed together. Elements and compounds are pure substances, not mixtures.

Which is an element ?

• H₂O

• Nacl

• AgNo3

• H

Answer explanation

The element is represented by the symbol 'H' in the periodic table, making 'H' the correct choice among the options provided.

What is the symbol for -:

(i) Atomic Number

(ii) Mass Number

• (i) Z

  (ii) A

• (i) A

  (ii) Z

• (i) N

  (ii) T

Answer explanation

(i) Z represents the Atomic Number and (ii) A represents the Mass Number, so the correct symbols are (i) Z and (ii) A.