http://com.ea.games.nfs13_row

1. 

Brass gets discoloured in air because of the presence of which of the following gases in air?

• Physical and chemical change.October 15, 2021
  Physical change is a change where no new substance is formed. Chemical change is a change where a new substance is formed.
• Tyndall effectOctober 13, 2021
  The scattaring a beam of light by colloidal particles is called Tyndall effect
• Tyndall effectOctober 15, 2021
  The scattaring a beam of light by colloidal particles is called Tyndall effect Tyndall effect

1. 

Brass gets discoloured in air because of the presence of which of the following gases in air?

A.OxygenB.Hydrogen sulphideC.Carbon dioxideD.Nitrogen