Chemistry 2nd Paper MCQ-Dhaka Board-2022

1. Which one is Lewis base?

2. In this reaction-

i. $\mathrm{AlCl}_{3}$ is Lewis acid

ii. electrophilic substitution reaction has occured

iii. A is a compound of the preparation of pesticide

Which one is correct?

3. Observe the following stem and answer the question :

Which gas will be liquified first?

4. What would be the change in volume If the temperature and pressure of a gas were doubled?

5. What is the concentration of $12 \%$ (w/v) $\mathrm{Na}_{2} \mathrm{CO}_{3}$ solution in morality?