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On putting few drops of an unknown liquid on pH strip, the colour of pH strip changed to green. The liquid taken is likely to be (1) water (2) dilute

hydrochloric acid (3) lemon juice (4) dilute sodium hydroxide solution


 Answer: (1) The green colour of the pH strip indicates that the liquid is neither acidic nor basic; it is neutral. Water is a neutral liquid (pH = 7). Hence, the liquid is likely to be water.
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