Question

1) A student performed following to activity in school Laboratory

Activity I: Addition of zinc dust into copper sulphate solution taken in a test tube.

Activity 2: Addition of an iron nail into copper sulphate solution taken in a test tube.

He noted down his observations and concluded that chemical reaction occurs in both the cases based on the

observed color change of the resulting solution.

a. What was the initial colour of the solution?

b. What is the final colour of the solution in Activity 1?

c. What is the final colour of the solution in Activity 2?

d. What are the products formed in Activity 2?

e. Based on these activities, what can you conclude about the reactivity of elements zinc and iron as

compared to that of copper?

​

Answer 1

Answer:

Explanation:

a.When zinc is added to copper sulphate (CUSO4) solution due to more reactivity of zinc, cooper is replaced by the zinc and forms zinc sulphate. During the process, the colour of the solution changes from blue to colourless.

b.When zinc metal is added to copper sulphate solution, the colour of CuSO4 solution disappears and colourless zinc sulphate solution is formed. Solid brown copper is deposited as it displaces by Zn.

c.When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green.

d.Chemical reaction of iron nail with copper sulphate solution in water. Iron displaces copper ions from an aqueous solution of copper sulphate. ... In this reaction, metallic iron is converted into ferrous ion (Fe2+) and cupric ion (Cu2 +) is converted into metallic copper. Fe (s) + Cu2 + (aq) —→ Fe2+ (aq) + Cu (s).

e.Zinc is more reactive than Cu and Fe metal. Iron displaces copper from its solution. Therefore, copper is less reactive than iron. Copper does not displace any metal therefore it is the least reactive.

Answer 2

$\huge\colorbox{red}{Àηѕωєя࿐ ❤}$

a. When zinc is added to copper sulphate (CUSO4) solution due to more reactivity of zinc, cooper is replaced by the zinc and forms zinc sulphate. During the process, the colour of the solution changes from blue to colourless.

b. When zinc metal is added to copper sulphate solution, the colour of CuSO4 solution disappears and colourless zinc sulphate solution is formed. Solid brown copper is deposited as it displaces by Zn.

c. When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green.

d. Chemical reaction of iron nail with copper sulphate solution in water. Iron displaces copper ions from an aqueous solution of copper sulphate. In this reaction, metallic iron is converted into ferrous ion (Fe2+) and cupric ion (Cu2 +) is converted into metallic copper. Fe (s) + Cu2 + (aq) —→ Fe2+ (aq) + Cu (s).

e. Zinc is more reactive than Cu and Fe metal. Iron displaces copper from its solution. Therefore, copper is less reactive than iron. Copper does not displace any metal therefore it is the least reactive.

#Behen hume v thanks do kam se kam 50, ..

Thanks..