Question

write definition of valency and n factor

Answer 1

Acids are the species which furnish H+ ions when dissolved in a solvent. For acids, n-factor is defined as the number of H+ ions replaced by 1 mole of acid in a reaction. ... The H atoms which are linked to oxygen are replaceable while the H atom linked directly to central atom (P) is nonreplaceable.

Answer 2

Valency is the combining capacity of an element. Valency of an element can be determined by the number of electrons/electron present in the outermost shell.

n is used to determine the number of shell.