46)Chlorination is
a process of converting chlorides into chlorine a chemical reaction in which chlorine is formed
adding small amount of chlorine to impure water the formation of salt containing chlorine
Answer :

47)The substance made of pure carbon is
acetic acid sugar
methane graphite
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48)The metal generally mixed with gold while making ornaments is
zinc silver
copper iron
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49)The greatest number of compounds are formed by the element
carbon nitrogen
oxygen hydrogen
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50)Gobar gas contains mainly
carbon dioxide acetylene
methane ethylene
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51)Soap is prepared by heating caustic soda with
kerosene oil almond oil
petrol linseed oil
Answer :

52)Heavy water
contains mor dissolved minerals and salts contains mor dissolved air
contains duterium in place of hydrogen contains organic impurities
Answer :

53)PVC plastics are obtained from vinyl chloride by the process of
polymerization cracking
reduction distillation
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54)Polythene is industrially prepared by the polymerization of
acetylene ethylene
methane styrene
Answer :

55)Natural rubber is a polymer of
vinyl chloride isoprene
acetylene ethylene
Answer :

56)The term PVC used in the plastic industry stands for
polyvinyl carbonate polyvinyl chloride
phospovinyl chloride phospovanadium chloride
Answer :

57)The term pH denotes the
temperature of a solution ionic strength of a solution
vapour pressure of a solution acidity or basicity of a solution
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58)The pH of an aqueous solution of hydrochloric acid will be around
2 6
9 12
Answer :

59)The pH value of 12 is of an aqueous solution of
ammonium sulphate sodium chloride
sodium hydroxide hydrogen chloride
Answer :

60)The element present in the largest amount in rocks and minerals is
carbon silicon
hydrogen copper
Answer :

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