Saloni was holding a test tube containing distilled water over a candle flame as she
required boiling water for one of the experiments she was trying to conduct at home. The
water didn’t start to boil even after holding it in the flame for quite some time. Her mother
told her that she was not holding the test tube properly
She then held the test tube in another position but in this case obtained a sooty deposit
on the outer side of the test tube. What did she do now?
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