Chemistry 1st Paper MCQ-Sylhet Board-2023

1. What is the $\mathrm{pH}$ value of $5 \times 10^{-3} \mathrm{M}$ $\mathrm{H}_{2} \mathrm{HO}_{4}$ solution?

2. Which one is a neutral oxide?

3. $\mathrm{PCl}_{5} \rightleftharpoons \mathrm{PCl}_{3}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g}) \text { At } 25^{\circ} \mathrm{C}$ temperature and $3 \mathrm{~atm}$ pressure $\mathrm{PCl}_{5}$ dissociate $80 \%$ of this reaction.

What is value of Kp of the stem reaction?

4. Here, A, B and C are not the regular symbol of the element.
In case of $A_{2} B$ compound-

i. Happen $\mathrm{sp}^{3}$ hybridization

ii. bond angle is $104.5^{\circ}$

iii. $\left(L_{P}-L_{P}\right)$ repulsion is there

Which one is correct?

5. Which one is called vinegar?