Question

Q32. (a) Write the chemical reaction taking place inside a soda acid fire extinguisher.
(b) Give reason why rubbing of baking soda on the bee stung area gives relief.
(c) Why does atomic size of elements decrease from left to right in a period?
(3)​

Answer 1

Explanation:

a)2NaHCO 3+H 2SO 4→Na 2SO 4+2H 2 O+2CO 2

b) baking soda is basic and beesting is acidic. hence rubbing of baking soda in bee stung area will neutralize the acidity of sting and give relief from intense itching and pain.

c) across a period, effective nuclear charge increases as electron shielding remains constant. A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius.