The ore of aluminium is

• chalco pyrites

• fluorspar

• hematite

• bauxite

Heat transfer horizontally within the atmosphere is called

• conduction

• convection

• absorption

• advection

Which one of the following is also known as solution?

• A compound

• A homogeneous mixture

• A heterogeneous mixture

• A suspension

Peroxyacetyl nitrate is

• secondary pollutant

• acidic dye

• plant hormone

• vitamin

A solid cannot change its shape easily compared to liquid because of

• bigger molecule size of solid

• higher density of solid

• stronger intermolecular force in solid

• larger intermolecular separation in solid

Heavy metals got their name because compared to other atoms they have

• higher atomic masses

• higher atomic numbers

• higher densities

• higher atomic radii

CaC₂ on treatment with water gives

• methane

• ethane

• ethylene

• acetylene

Chemical decomposition of an organic compound by water is called as

• Hydrogenation

• Hydration

• Hydrolysis

• All of these

Photo chemical smog is a resultant of the reaction among

• NO₂,  O₃ and peroxyacetyl nitrate in the presence of Sunlight

• High concentration of NO₂,  O₃  and CO in the evening

• CO, O₂ and peroxy acetyl nitrate in the presence of Sunlight

• CO, CO₂ and NO₂ at low temperature

The term brown air is used for

• industrial smog

• sulfurous smog

• acid fumes

• photochemical smog