When the pressure of a gas doubt, does the volume:
A. Doubles
B. triples
C. Halves
D. Quarters
E. Remains constant

it will halves

Explanation:

if the volume is doubled then the pressure is halves.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

the answer is b & c i believe : )