HSC, Admission ও BCS এর সেরা প্রস্তুতি

প্রশ্ন ৮·সময় ২ ঘণ্টা ৩৫ মিনিট

1. Follow the given thermo chemical reaction and answer related questions :

$\mathrm{X}_{2} \mathrm{Y}_{4}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{XY}_{2}(\mathrm{~g}) ; \Delta \mathrm{H}=+$ ve, here at two states like-

(i) At $25^{\circ} \mathrm{C}$ and $2.0 \mathrm{~atm}$ pressure;

(ii) At $80^{\circ} \mathrm{C}$ and $6.0 \mathrm{~atm}$ pressure $\mathrm{X}_{2} \mathrm{Y}_{4}$ dissociate in different amounts

Din.B 22

2. Answer the questions related to given stem:

Atomic number	6	14	15	16	17	18
Elements	A	B	C	D	E	F

Din.B 22

3. Try to understand the given stem and then answer related questions :

Din.B 22

4. Answer the questions related to given stem:

Element (symbolic)	Valence electrons
$\mathrm{P} \rightarrow$	$(\mathrm{n}-1) \mathrm{s}^{1}[$ Here $\mathrm{n}=2]$
$\mathrm{Q} \rightarrow$	$\mathrm{ns}^{2} \mathrm{np}^{2}$
$\mathrm{R} \rightarrow$	$\mathrm{ns}^{2} \mathrm{np}^{3}$
$\mathrm{S} \rightarrow$	$\mathrm{ns}^{2} \mathrm{np}^{4}$

Din.B 22

5. Try to understand the given stem and answer the questions:

Din.B 22

Chemistry 1st Paper CQ-Dinajpur Board-2022