Activity 2.4 NCERT Class 10 Science, Acids, Bases and Salts

Activity 2.4 NCERT Class 10 Science, Chapter 2 Acids, Bases, and Salts.

Procedure: Activity 2.4 asks us to treat zinc granules with bases like sodium hydroxide.

Observation: Bubbles come out from zinc granules. These bubbles catch fire when the flame is brought towards the test tube.

Explanation: Just like a metal reacts with acid (see Activity 2.3), metal also react to bases and produce hydrogen gas.

Here, zinc reacts with sodium hydroxide and forms the oxide of zinc with the evolution of hydrogen. The reaction is vigorous. So we use dilute bases to moderate the reaction.

Zn(s) + 2NaOH(aq) ———-> Na2ZnO2(s) + H2(g)


Metals react with bases and form hydrogen gas bubbles.

Next: Reaction of metal carbonates and hydrogen carbonates with acid. Activity 2.5.

See also: Zinc reaction with acids. Activity 2.3.

Other activities from NCERT class 10 science Chapter 2.

Ref: NCERT textbook for class 10 Science.

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