CBSE Class 10 Science 2017 · Paper 31/2/1 · Question 34
(A) If you are asked to report your observations about the following two properties of acetic acid, what would you report ?
- (i)Odour
- (ii)Effect on litmus (B) If you take a pinch of sodium hydrogen carbonate powder in a test-tube and add drop-by-drop acetic acid to it, what would you observe immediately ? List any two main observations.
Answer
Acetic acid smells of vinegar and turns blue litmus red; with sodium hydrogen carbonate it gives brisk effervescence of carbon dioxide.
(A) (i) Acetic acid has a pungent smell of vinegar. (ii) It turns blue litmus red; red litmus stays red.
(B) (1) Brisk effervescence: bubbles of gas are given off at once. (2) The gas is colourless and odourless, and it turns lime water milky, showing that it is carbon dioxide: .
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