Задание 7 ЕГЭ по химии

3245

А) S — 3) $Cl_{2}$, $Hg$, $H_{2}$

• $S + Cl_{2} = SCl_{2}$

• $Hg + S = HgS$

• $H_{2} + S \overset{t}{\rightarrow} H_{2}S$

Не подходят: $S + H_{2}O \cancel{=}$, $S + BaO \cancel{=}$, $S + HCl \cancel{=}$

Б) Ba — 2) $Br_{2}$, $H_{2}O$, $HF$

• $Ba + Br_{2} = BaBr_{2}$

• $Ba + 2H_{2}O = Ba(OH)_{2} + H_{2}\uparrow$

• $Ba + 2HF = BaF_{2} + H_{2}\uparrow$

Не подходят: $Ba + CO \cancel{=}$, $Ba + Na_{2}O \cancel{=}$

В) $Fe_{2}O_{3}$ — 4) $HCl$, $Al$, $CO$

• $Fe_{2}O_{3} + 6HCl = 2FeCl_{3} + 3H_{2}O$

• $Fe_{2}O_{3} + 2Al \overset{t}{\rightarrow} Al_{2}O_{3} + 2Fe$

• $Fe_{2}O_{3} + 3CO \overset{t}{\rightarrow} 2Fe + 3CO_{2}$

Не подходят: $Fe_{2}O_{3} + H_{2}O \cancel{=}$, $Fe_{2}O_{3} + Br_{2} \cancel{=}$

Г) $SO_{2}$ — 5) $H_{2}O$, $Na_{2}O$, $H_{2}O_{2}$

• $SO_{2} + H_{2}O = H_{2}SO_{3}$

• $SO_{2} + Na_{2}O = Na_{2}SO_{3}$

• $SO_{2} + H_{2}O_{2} = H_{2}SO_{4}$

Не подходят: $SO_{2} + HF \cancel{=}$, $SO_{2} + P_{2}O_{5} \cancel{=}$, $SO_{2} + Hg \cancel{=}$

Ответ: 3245