Class X Sciences
[papers from previous years]
A student takes 2 mL acetic acid in a dry test tube and adds a
pinch of sodium hydrogen carbonate to it. He makes the following
I. A colourless and odourless gas evolves with a brisk
II. The gas turns lime water milky when passed through it.
III. The gas burns with an explosion when a burning splinter is
brought near it.
IV. The gas extinguishes the burning splinter that is brought
The correct observations are:
(A) I, II, and III
(B) II, III and IV
(C) III, IV and I
(D) IV, I and II