Question

1. Explain with the help of chemical equations what happens when:

i. Copper is heated strongly in air
.

ii. Iron reacts with steam.


iii. Sodium reacts with dilute sulphuric acid.


iv. Zinc is added to sodium hydroxide
.

v. Copper is added to zinc sulphate solution.



what is the answer for this question​

Answer 1

Answer:

i.When copper is heated in air, it reacts with the oxygen of air to form a black compound copper oxide.

ii. When a metal reacts with steam then the products formed are metal oxide and hydrogen gas. When red hot iron reacts with steam to form iron(II,III) oxide and hydrogen.

iii.Sodium metal dissolves readily in dilute sulphuric acid to form solutions containing the aquated Na(I) ion together with hydrogen gas, H2.

iv.When sodium hydroxide solution is heated with zinc granules then Sodium zincate and hydrogen gas are formed. The salt formed by the reaction between a base and a metal, the metal is present as a part of the Negative ion.

v.when zinc granules are kept in copper sulphate solution, the blue colour of copper sulphate disappears and the solution becomes colourless. Zinc is more reactive than copper and hence displaces copper from copper sulphate solution and forms zinc sulphate.

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