HSC, Admission ও BCS এর সেরা প্রস্তুতি

প্রশ্ন ৮·সময় ২ ঘণ্টা ৩৫ মিনিট

1. At $120^{\circ} \mathrm{C}$ temperature and $1.5 \mathrm{~atm}$ , pressure the below reaction is at equilibrium state-

$\mathrm{AB}_{5}(\mathrm{~g}) \rightleftharpoons \mathrm{AB}_{3}(\mathrm{~g})+\mathrm{B}_{2}(\mathrm{~g})$

Here $A$ and $B$ are the elements of 3 rd period and $A B_{5}$ is dissociated $30 \%$ .

CB 22

CB 22

CB 22

4. A student wrote the following two electronic configurations for $A$ and $B$ :

$A(19)=1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{1}$ (according to Aufbau rule)

CB 22

CB 22

Chemistry 1st Paper CQ-Cumilla Board-2022