A) Nitrogen B) Hydrogen C) Oxygen D) Carbon dioxide

A) red B) orange C) blue D) green

A) an amino group B) a five-carbon sugar C) both 1 and 2 D) a water molecule

A) Heavy water B) Graphite C) Water D) Calcium

A) Blue litmus paper turns white B) Blue or red litmus paper does not change its colour C) Blue litmus paper turns red D) Red litmus paper turns blue

A) Soluble in water and insoluble in petrol B) High melting and boiling points C) Low melting and boiling points D) Solid and hard

A) 14 B) 7 C) 11 D) 5

A) Reduction B) Rancidity C) Acidity D) Corrosion

A) Sodium, Potassium B) Magnesium, Aluminium C) Sodium, Chlorine D) Aluminium, Chlorine

A) Only I and II B) Only I and III C) Only II and III D) All I, II and III