Name two domestic fuels which burn without giving any smoke.

Name two metals which are purified by liquation.

Name two elements which d not give flame test.

Write name of two metals which reacts with acid.

Name the metal which floats on water without any apparent reaction with it.

Name two gases which react with each other to form a solid. Give th equation and write down the name of the solid formed.

Name two metals which are purified by chromatography.

Name two pesticides which are used in agricultural field.

Name two enzymes which help in protein digestion.

Name two thermodynamic properties which are addictive.

Name two elements which have allotropy forms.