1(iv)
Ammonia gas is passed through quicklime and then collected in a jar. Red and blue litmus papers are placed in the jar. W, X, Y and Z are the four observations. Which of the above observations correctly shows the reaction of the litmus papers to ammonia?
| Red litmus paper | Blue litmus paper | |
|---|---|---|
| W | turns blue | remains blue |
| X | remains red | remains blue |
| Y | remains red | turns red |
| Z | turns blue | turns red |
- (a)W
- (b)X
- (c)Y
- (d)Z
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W
Reason — Quick lime (CaO) is a drying agent and absorbs the moisture from ammonia gas without reacting with it, hence red litmus turns blue as ammonia gas is basic in nature.