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.

Answer 1

Answer:

When sodium hydroxide is heated with Zinc granules - Sodium Zincate and hydrogen gas is evolved. 2NaOH(aq)+Zn(s)→Na2ZnO2(aq)+H2(g)↑ When burning splinter is brought near the mouth of the test tube, it burns with a pop sound. lf Zinc granules react with strong; acids (HCl or H2SO4) then again Hydrogen gas will be evolved. Zn(s)+(dil)2HCl→ZnCl2+H2↑ Zn(s)+(dil)H2SO4→ZnSO4+H2↑