The valency of helium is zero.

Important Questions on Atomic Structure and Transformation of Matter

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Chemistry>Chapter 2 - Atomic Structure and Transformation of Matter>PRACTICE QUESTIONS (COMPETITION WING)>Q 18

The name of ${\mathrm{CrO}}_4^{2-}$ radical is dichromate ion.

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Chemistry>Chapter 2 - Atomic Structure and Transformation of Matter>PRACTICE QUESTIONS (COMPETITION WING)>Q 19

Rusting of iron is an example of both physical and chemical change.

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Chemistry>Chapter 2 - Atomic Structure and Transformation of Matter>PRACTICE QUESTIONS (COMPETITION WING)>Q 20

Sublimation of camphor is a physical change. 

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Chemistry>Chapter 2 - Atomic Structure and Transformation of Matter>PRACTICE QUESTIONS (COMPETITION WING)>Q 21

The central part of the atom called nucleus accounts for the mass of an atom. 

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Chemistry>Chapter 2 - Atomic Structure and Transformation of Matter>PRACTICE QUESTIONS (COMPETITION WING)>Q 22

Both protons and neutrons possess the same magnitude of charge but opposite signs. 

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Chemistry>Chapter 2 - Atomic Structure and Transformation of Matter>PRACTICE QUESTIONS (COMPETITION WING)>Q 23

The maximum number of electrons in the $\mathrm{L}$ shell is two. 
 

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Chemistry>Chapter 2 - Atomic Structure and Transformation of Matter>PRACTICE QUESTIONS (COMPETITION WING)>Q 24

An atom is electrically neutral.

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Chemistry>Chapter 2 - Atomic Structure and Transformation of Matter>PRACTICE QUESTIONS (COMPETITION WING)>Q 25

In phosphide ion, the total number of electrons is equal to $12$.