1.

A student adds a few drops of ethanoic acid to test tubes X, Y and Z containing aqueous solutions of sodium chloride, sodium hydroxide and sodium carbonate, respectively. If he now brings a burning splinter near the mouth of the test-tubes immediately after adding ethanoic acid in each one of them, in which of the test tube or test-tubes the flame will be extinguished ? (A) X and Y (B) Y and Z (C) XandZ (D) onlyZ

Answer»

(D)only ZExplanation:Only TEST tube Z wlll be EXTINGUISHED. The flame will be extinguished when test tube Z is brought near a BURNING splinter due to evolution of carbon DIOXIDE gas, which does not support combustion.HOPE IT HELPS YOU!!!



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