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Hydrochloric Acid

Which is used...

Question

Which is used to separate $A l_{2} O_{3}$ and $F e_{2} O_{3}$ ?

A

NaOH

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B

dil HCl

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C

H_{2} S O_{4}

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D

any acid

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Solution

The correct option is A NaOH
$A l_{2} O_{3}$ is soluble in excess of $N a O H$ while $F e_{2} O_{3}$ is not.

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Similar questions

Q. Which reducing agent is used for reducing

Z n O, F e_{2} O_{3}, A l_{2} O_{3}

10 g

A l

is used for reduction in each of the following alumino thermic reactions, which reaction would generate more heat and by how much ?
a.

2 A l + C r_{2} O_{3} \to A l_{2} O_{3} + 2 C r

2 A l + F e_{2} O_{3} \to A l_{2} O_{3} + 2 F e

Standard heat of formation of

A l_{2} O_{3}

C r_{2} O_{3}

F e_{2} O_{3}

- 1676 k J

- 1141 k J

- 822.2 k J

, respectively.

Q. Classify the following oxides into acidic, basic and amphoteric.

C a O

M g O

C O_{2}

S O_{3}

N a_{2} O

Z n O

A l_{2} O_{3}

F e_{2} O_{3}

Q. In the redox titration using potassium permanganate, the acidification is usually done using

H_{2} S O_{4}

H C l

Q. For the reaction

2 A l + F e_{2} O_{3} ⟶ 2 F e + A l_{2} O_{3}

, the standard heat enthalpy of

F e_{2} O_{3}

A l_{2} O_{3}

- 196.5

- 399.1

kcal respectively.

Δ H^{\circ}

for the reaction is:

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