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Crystalline and Amorphous Solid

Cr2O3, Fe2O...

Question

$C r_{2} O_{3}$ , $F e_{2} O_{3}$ and $A l_{2} O_{3}$ are isomorphous but $N a N O_{3}$ and $K N O_{3}$ are not isomorphous.

True

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False

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Solution

The correct option is A True
Two or more substances having same crystal structure are said to be isomorphous. They contain constituent atoms of the substance in the same atomic ratio.
$C r_{2} O_{3}$ , $F e_{2} O_{3}$ and $A l_{2} O_{3}$ are isomorphous but $N a N O_{3}$ and $K N O_{3}$ are not isomorphous as they have different crystal structures even-though they have same atomic ratio, similar molecular formula and similar chemical properties.

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Similar questions

10 g

A l

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

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

The enthalpies of formation of $A l_{2} O_{3}$ and $C r_{2} O_{3}$ are $- 1569 K J$ and $- 1134 K J$ respectively. $Δ H$ for the reaction

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

A l_{2} O_{3}

C r_{2} O_{3}

Δ H

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

The enthalpies of formation of $A l_{2} O_{3}$ and $C r_{2} O_{3}$ are $- 1569 K J$ and $- 1134 K J$ respectively. $Δ H$ for the reaction

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

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

F e_{2} O_{3}

A l_{2} O_{3}

- 196.5

- 399.1

Δ H^{\circ}

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