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Question

In a test, Rashi has to write the chemical equation for the formation of Hydrochloric acid. She wrote

H2+2Cl2 HCl

The teacher marked the answer wrong. Why is it so?



Your Answer
A

The equation is not balanced.

Your Answer
B

Hydrogen and chlorine do not react to form hydrochloric acid.    

Correct Answer
C

In this 2 atoms of chlorine were used insteadof1 molecule of chlorine.   

Your Answer
D

In this 2 molecule of chlorine was used instead of 2 atoms of chlorine.    


Solution

The correct option is C

In this 2 atoms of chlorine were used insteadof1 molecule of chlorine.   


The correct equation should be:

H2+Cl22 HCl

2Cl means 2 atoms of chlorine while Cl2 means 1 molecule of chlorine formed from 2 atoms.

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