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In a test-tube, hydrochloric acid is pou...

In a test-tube, hydrochloric acid is poured over a few zinc granules. List two observations that suggest that a chemical reaction has occurred.
`2HCl+ZnrarrZnCl_(2)+H`

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(i) A colourless gas is evolved .
(ii) Test-tube becomes hot .
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OSWAAL PUBLICATION-CHEMICAL REACTIONS AND EQUATIONS-TOPIC-1 (Chemical Reactions and Equations) (SHORT ANSWER TYPE QUESTIONS-I)
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