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General Principles and Pr question bank (Chemistry)

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Q1.

In the leaching method, bauxite ore is digested with a concentrated solution of $\mathrm{NaOH}$ that produces ' $\mathrm{X}$ '. When $\mathrm{CO}_2$ gas is passed through the aqueous solution of ' $X^{\prime}$, a hydrated compound ' $\mathrm{Y}^{\prime}$ ' is precipitated. ' $\mathrm{X}$ ' and ' $\mathrm{Y}$ ' respectively are.

(A)

$\mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_4\right]$ and $\mathrm{Al}_2\left(\mathrm{CO}_3\right)_3 \cdot \mathrm{xH}_2 \mathrm{O}$

(B)

$\mathrm{Al}(\mathrm{OH})_3$ and $\mathrm{Al}_2 \mathrm{O}_3 \cdot \mathrm{xH}_2 \mathrm{O}$

(C)

$\mathrm{NaAlO}_2$ and $\mathrm{Al}_2\left(\mathrm{CO}_3\right)_3 \cdot \mathrm{xH}_2 \mathrm{O}$

(D)

$\mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_4\right]$ and $\mathrm{Al}_2 \mathrm{O}_3 \cdot \mathrm{xH}_2 \mathrm{O}$

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Q2.

Which series of reactions correctly represents the chemical relations related to iron and its compound?

(A)

Fe \overset{dilute H_{2} {SO}_{4}}{\to} {FeSO}_{4} \overset{H_{2} {SO}_{4}, O_{2}}{\to} {Fe}_{2} {({SO}_{4})}_{3} \overset{heat}{\to} Fe

(B)

Fe \overset{O_{2}, heat}{\to} FeO \overset{dilute H_{2} {SO}_{4}}{\to} {FeSO}_{4} \overset{heat}{\to} Fe

(C)

Fe \overset{{Cl}_{2}, heat}{\to} {FeCl}_{3} \overset{heat, air}{\to} {FeCl}_{2} \overset{Zn}{\to} Fe

(D)

Fe \overset{O_{2}, heat}{\to} {Fe}_{3} O_{4} \overset{CO, 600 ℃}{\to} FeO \overset{CO, 700 ℃}{\to} Fe

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