Question

Q.7)Zn + dil H,SO, → H, +ZnSO,
Read the equation and answer. What would happen if:
a)Zn granules are replaced by Zn dust.
b)dil HCl is used
c)Cu is taken instead of Zn​

Answer 1

Answer:

(a) Reaction will remain same

(b) The products will be ZnCl₂ and H₂.

(c) Products will be CuSO₄ and H₂.

Explanation:

(a) Zinc dust and zinc granules only differ in size level. The chemical reactions take place at atomic level. Since element used is same therefore reaction will also be same.

(b) Zn + dil HCl → H₂ + ZnCl₂

(c) Cu + dil H₂SO₄ → H₂ + CuSO₄

Answer 2

Chemical Reactions :

7. $\boxed{\mathsf{\green{Zn\:+\:H_{2}SO_4\:{\rightarrow{\:H_2\:+ZnSO_4}}}}}$

( a ). When Zn granules are replaced by Zn dust :

The rate of reaction may slightly change and increase much faster than in the presence of Zn granules due to increase in surface area.

( b ). If dil. HCl is used in place of $\mathsf{H_{2}SO_4}$ :

Reaction becomes :

$\boxed{\mathsf{\green{Zn\:+\:2HCl\:{\rightarrow{\:H_2\:+ZnCl_2}}}}}$

Since, HCl and $\mathsf{H_{2}SO_4}$, both are strong acids. They will produce the Hydrogen gas and form salt. ( In this case,$\mathsf{ZnCl_2}$.)

( c ). Reaction changes as follows :

$\boxed{\mathsf{\green{Cu\:+\:H_{2}SO_4\:{\rightarrow{\:H_2\:+CuSO_4}}}}}$