Chemistry 1st Paper MCQ-Dhaka Board-2022

1. What will be the bond angle in $\mathrm{PCl}_{6}$ molecule?

2. $\mathrm{M}_{2} \mathrm{~N}_{2}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{A}+\mathrm{B}(\mathrm{g})$; for the compound B-

i. shows besic property

ii. is triangular pyramidal

iii. forms co-ordination bond

Which one is correet?

3. What is the value of $l$ for $f$ orbital?

4. $2 \mathrm{~A}_{2}(\mathrm{~g})+\mathrm{B}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{~A}_{2} \mathrm{~B}(\mathrm{~g}) ; \Delta \mathrm{H}$ $=(+)$ Ve for this reaction applicable-

i. unit of $\mathrm{Kp}$ is $\mathrm{atm}^{-2}$

ii. increases the product with increasing temperature

iii. rate constant is fixed

Which one is correet?

5. Which of the following in used as natural preservatives?