...................gives hardness to stainless steel.

• Zinc

• Lead

• Carbon

• Tin

Absolute Zero is defined as

• The temperature at which all molecular motion ceases

• At which water boils at 298K

• At which liquid Helium boils

• At which the volume becomes zero

Acid rain is caused by

• Co and CO

• SO₂ and O₂

• SO₂ and NO₂

• NO₂ and O₂

Activated Charcoal is used to remove colouring matter from pure substances by .............

• Bleaching

• Oxidation

• Adsorption

• Reduction

Alchohol is more volatile than water because __________ is lower than water.

• its boiling point

• its density

• its viscosity

• its surface tension