Question

Q. 24 2ml of sodium hydroxide solution is added to few pieces of grannulated Zn metal taken in test-tube. When the contents are warmed, a gas is
evolved which is bubbled through soap solution before testing. Write the equation of chemical reaction involved and test to detect gas. Name
the gas which will be evolved when same metal reacts with solution of strong acid.
(CBSE-2018)​

Answer 1

When zinc is added in sodium solution sodium zincate (Na

2

ZnO

2

) is formed along with hydrogen gas.

2NaOH+Zn→Na

2

ZnO

2

+H

2

When burning splint is held near the evolved it continues burning with pop sound indicating evolution of Hydrogen gas.

Same metal i.e Zn reacts with strong acid H

2

SO

4

to give ZnSO

4

Zn+H

2

SO

4

→ZnSO

4

+H

2

↑

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