Question

What are olfactory indicator dry HCl gas does not change the colour of dry blue litmus paper?​

Answer 1

Answer:

• those substances whose smells changes in acidic or basic solution are called olfactory indicators.
• example

1. *onion
2. *vanilla essence.

Answer 2

Answer:

because it does no iones to for H+ ions

Explanation:

it only produce H+ ions in its aquas solution