Question

B. i. Which is the characteristic test used to detect the evolution of hydrogen gas du
. reaction.
on of hydrogen gas during a chemical reaction​

Answer 1

Explanation:

CaO+CO2=caco3+H2 hjkgdfg

Answer 2

Answer:

place a burning match stick above the bealer in which the reaction has happend.If the matchstich makes a pop sound then hydrogen is evolved othere

wise it is not evolved.

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