Chemistry
Assertion (A): Few drops of dilute acid is added to a solution of zinc sulphide, a colourless gas is formed with a rotten egg odour.
Reason (R): Gas formed does not turn moist lead acetate paper silvery black.
- Both A and R are true.
- A and R are true, but R is the correct explanation of A.
- A is true, but R is not the correct explanation of A.
- Both A and R are false.
Hydrogen Chloride
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Answer
A is true, but R is not the correct explanation of A
Reason — When you add dilute acid like HCl to zinc sulphide (ZnS), a colourless H2S gas is formed with the a rotten egg odour. Hence, the assertion (A) is true.
H2S reacts with moist lead acetate paper and forms black PbS (lead sulphide). Hence, reason (R) is not the correct explanation of assertion (A).
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