The Diagram Shows the Reaction Between Metal and Dil. Acid - Bzziii.com

The diagram shows the reaction between metal and dil. acid.

What is the reason for different behaviour of Mg in test tube B? 

A. Mg is lighter element than dil. HCl 

B. Mg reacts with dil. HCl to produce H2 gas which helps in floating 

C. Mg reacts with dil. HCl to produce N2 gas which helps in floating 

D. Mg reacts with dil. HCl to produce CO2 gas which helps in floating

B. Mg reacts with dil. HCl to produce H2 gas which helps in floating 

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CBSE Class 10 Science Sample Paper-2022