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CBSE Class 10 Answered

In the following questions (13-16), a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. a) Assertion and reason both are correct statements and reason is correct explanation for assertion. b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. c) Assertion is correct statement but reason is wrong statement. d) Assertion is wrong statement but reason is correct statement. a. Assertion: When zinc granules are added to dilute hydrochloric acid effervescence occurs. Reason: Formation of CO2 gas is the cause of effervescence.  
Asked by palakkothari46 | 22 Jun, 2021, 11:58: AM
Expert Answer
When hydrochloric acid reacts with zinc than it forms Zinc chloride and releases hydrogen gas. 
Chemical equation for this-
Zn plus 2 HCl rightwards arrow ZnCl subscript 2 plus straight H subscript 2
This efferevescence is caused by hydrogen gas. It is not caused by CO2 . 
 
So, Correct option is (c). Assertion is correct statement but reason is wrong.
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