Chemistry 2nd Paper MCQ-Dinajpur Board-2023

1. Which salt causes temporary hardness in water?

2.

i. $\mathrm{FeSO}_{4}$ is oxidised

ii. produce the salts

iii. the oxidation numb of each Mn changes.

Which one is correct?

3. For an ideal gas-

i. $\mathrm{PV}=\mathrm{nRT}$

ii. $\left(\frac{\delta u}{\delta v}\right)_{T}=0$

iii. molar volume is $22.414 \mathrm{~L}$ at STP

Which one is correct?

4. If 2F electricity' is passed then how many grams of ferrous ion will be discharged?

5. $4.9 \mathrm{~g}_{1}$ of $\mathrm{H}_{2} \mathrm{SO}_{4}$ Is Dissolved in $50 \mathrm{~mL}$ of solution. The concentration of the solution is-

i. $1 \mathrm{M}$

ii. $98000 \mathrm{ppm}$

iii. $9.8 \times 10^{4} \mu \mathrm{g} / \mathrm{mL}$

Which one is correct?