Answer:
Activity
1 g solid NaCI is taken in a clean and dry test tube as setup in the
apparatus as shown
Some concentrated sulphuric acid is added to the test tube.
Then, with the help of dry and wet litmus papers, the gas coming out of the
tube is tested. (3)
Observation
It is observed that the colour of dry litmus paper does not
change while the colour of moist litmus paper changes from blue to red.
This shows that dry HCl gas does not show acidic character
whereas HCl solution shows.
(1)
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