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| 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 | ||
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| 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 | ||
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| 52)Heavy water | |||
| contains mor dissolved minerals and salts | contains mor dissolved air | ||
| contains duterium in place of hydrogen | contains organic impurities | ||
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| 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 | ||
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| 55)Natural rubber is a polymer of | |||
| vinyl chloride | isoprene | ||
| acetylene | ethylene | ||
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| 56)The term PVC used in the plastic industry stands for | |||
| polyvinyl carbonate | polyvinyl chloride | ||
| phospovinyl chloride | phospovanadium chloride | ||
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| 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 | ||
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| 59)The pH value of 12 is of an aqueous solution of | |||
| ammonium sulphate | sodium chloride | ||
| sodium hydroxide | hydrogen chloride | ||
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| 60)The element present in the largest amount in rocks and minerals is | |||
| carbon | silicon | ||
| hydrogen | copper | ||
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