Which of the following are not compounds?
(a) Chlorine gas (b) Potassium chloride (c) Iron (d) Iron sulphide (e) Aluminium (f) Iodine (g) Carbon (h) Carbon monoxide (i) Sulphur powder

Which of the following are not compounds ? (a) Bromine gas (b) sodium chloride (c ) Magnesium (d) Iron sulphide (e) Aluminium (f) Silver (g) Carbon (h) Carbon dioxide (i) Sulphur powder.

Which of the following compounds are administered as antacids : (a) Sodium carbonate (b) Sodium hydrogen carbonate (c ) Aluminium carbonate (d) Magnesium hydroxide

Write the chemical formulae of the following. (a) Magnesium chloride (b) Calcium oxide (c) Copper nitrate (d) Aluminium chloride (e) Calcium carbonate.

Which of the following materials fall in the category of a pure substance ? (a) Ice (b) Milk (c ) Iron (d) Hydrochloric acid (e ) Calcium oxide (f) Mercury (g) Brick (h) Wood (i) Air.

Write the balanced chemical equations for the following reactions : (i) "Hydrogen + Chlorine " to " Hydrogen chloride" (ii) "Magnesium oxide + Carbon " to " Magnesium + Carbon monoxide" (iii) "Phosphorus pentachloride + Water " to " Phosphoric acid + Hydrogen chloride" (iv) "Sulphur dioxide + Oxygen " to " Sulphur trioxide" (v) "Sodium + Water " to " Sodium hydroxide + Hydrogen" .

Classify the following into elements, compounds and mixtures. (a) Sodium (b) Soil (c ) Sugar solution (d) Silver (e ) Calcium carbonate (f) Tin (g) Silicon (h) Coal (i) Air (j) Soap (k) Methane (l) Carbon dioxide (m) Blood

Write the chemical formulae of the following: (a)Magnesium chloride (b)Calcium oxide (c )Sodium sulphide (d)Aluminium phosphate (e)potassium chloride (f)Calcium carbonate.

Give the formulae of the compounds that will be formed from the following sets of elements. (a) Calcium and fluorine (b) Magnesium and oxygen (c )Sodium and sulphur (d) Carbon and chlorine (e )Carbon and sulphur (f) Nitrogen and hydrogen.