Question

2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal
taken in a test tube. When the contents are warmed, a gas evolves which is bubbled
through a soap solution before testing. Write the equation of the chemical reaction
involved and the test to detect the gas. Name the gas which will be evolved when the
same metal reacts with dilute solution of a strong acid.

Answer 1

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Answer 2

• Zn + 2NaOH → Na2ZnO2 + H2

zinc + sodium hydroxide ⇒ sodium zincate + hydrogen↑

(exothermic reaction)

• When a burning splinter is brought near the gas, it burns with a Pop Sound.

• Gas evolved - Hydrogen / H2

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