Chemistry 1st Paper MCQ-Cumilla Board-2019

1.

2. Which is alkaline buffer solution?

(a) $\mathrm{NaOH}+\mathrm{NaCl}$

(b) $\mathrm{NH}_{4} \mathrm{OH}+\mathrm{NH}_{4} \mathrm{Cl}$

(C) $\mathrm{CH}_{3} \mathrm{COOH}+\mathrm{CH}_{3} \mathrm{COONa}$

(d) $\mathrm{NH}_{4} \mathrm{OH}+\left(\mathrm{COONH}_{4}\right)_{2}$

2. Which is the solubility product of Magnesium Phosphate?

3.

1. Which one has the lowest dissociate temperature?

(a) $\mathrm{Na}_{2} \mathrm{CO}_{3}$

(b) $\mathrm{MgCO}_{3}$

(C) $\mathrm{K}_{2} \mathrm{CO}_{3}$

(d) $\mathrm{BaCO}_{3}$

4. What is an $\alpha$-particle?

5. What is the value of rider constant in gram if zero used in middle and 50 used at end of the balance and rider weight is $\mathbf{~ m g}$.