Question

Which chemical reaction involves the production of a gas?
2Li(s) + F2(g) mc012-1.jpg 2LiF(s)
Zn(s) + 2HCl(aq) mc012-2.jpg H2(g) + ZnCl2(aq)
HNO3(l) + H2O(l) mc012-3.jpg H3O+(aq) + NO3–(aq)
K2CrO4(aq) + Ba(NO3)2(aq) mc012-4.jpg BaCrO4(s) + 2KNO3(aq)

Answer 1

The correct answer is B just took the test

Answer 2

Option B chemical reaction involves the production of gas.

What is a chemical equation?

A representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product.

In reaction $Zn + 2HCl$ → $ZnCl_2 + H_2$ element present in the solution is displaced by another reactive element. In this case, Zinc is displacing Hydrogen from HCl.

Thus, this is an example of a displacement reaction where hydrogen gas is released.

Hence, option B is correct.

Learn more about chemical equations here:

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