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2014-08-11T18:17:47+05:30
Substances which r sourĀ  and taste and change blue to red litmus r called acids ex: citric acid
substances which r soapy to touch and change red to blue litmus r called bases ex:calcium hydroxide
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2014-08-11T20:43:07+05:30
Acids are electron pair acceptorsbases are electron pair donors
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