Question

Some materials like magnesium ribbon, aluminium foil, copper wire and charcoal powder were taken in different test tubes labeled as P. Q, R and S. 5.5mL of dilute hydrochloric acid was added to each test tube. When a burning matchstick is brought near the mouth of each test tube, in which cases pop sound would be heard?.
A. Only P
B. Only P and Q
C. Only Q and S
D. Only P, Q and R​

Answer 1

Answer:

Correct option is

B

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Answer 2

Answer:

Correct option is B. only P and Q

Explanation:

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