Asked by Harshvardhan | 11th May, 2008, 12:49: PM

Expert Answer:

The metal in the reactions with an acid displaces hydrogen from
the acids. This is seen as hydrogen gas. The metal combines with the
remaining part of the acid and forms a compound called a salt. Thus,
the reaction of a metal with an acid can be summarised as –
Acid + Metal → Salt + Hydrogen gas


 2 NaOH + Zn → Na2ZnO2 + H2

                            (Sodium Zincate)

Test of Hydrogen gas:Pass the gas being evolved through the soap solution. Bubbles will be formed in the soap solution.Take a burning candle near a gas filled bubble.If the gas is hydrogen it burns with a pop sound.


Answered by  | 14th Jun, 2008, 03:11: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.