1) When is chlorine obtained ? a) When electricity is passed through NaOH b) When electricity is passed through hydrogen c) When electricity is passed through an aqueous solution of brine d)  When water is added to hydrogen 2) What is the chemical name of plaster of Paris? a) Calcium Sulphate Hemihydrate b) Calcium Sulphate dihydrate c) Sodium carbonate decahydrate d) Ferric oxide 3) 'Ph' is ? a) Photo b) Power c) Power of hydrogen ion concentration 4) Increasing Ph is equivalent to? a) Increasing acidic nature b) Increasing Hydrogen ion concentration c) Decrease Hydroxyl (OH-) ion concentration d) Increasing OH- ion concentration 5) What Is the chemical formula of bleaching powder? a) H2SO4 b) Ca(OH)2 c) CaOCl2 d) NaHCO3 6) Tooth enamel is made up of ? a) Ferric oxide b) Calcium hydroxyapatite c) Sodium hydroxide d) Sodium carbonate 7) Hydrogen is used for? a) Water treatment b) Soaps and detergents c) Ammonia for fertilizers d) CFCs 8) What gives us washing soda? a) Heating Baking soda b) Recrystallisation of sodium chloride c) Recrystallisation of sodium carbonate 9) Mixing concentrated acids or bases with water is ? a) Endothermic b) Heating c) Exothermic d) Lightning 10) Colour of methyl orange in an acid ? a) Yellow b) Pink c) Colourless d) Red

Acids,based and salts

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