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Types of Redox Reactions

Formula for a...

Question

Formula for agate is:

A

{N a}_{2} S i O_{3}

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B

K_{2} O \cdot S i O_{2} \cdot {A l}_{2} O_{3}

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C

S i O_{2}

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D

C a F_{2}

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Solution

The correct option is D $S i O_{2}$
Quartz is found in many varieties which have different colour due to impurities eg, amelthyst (purple), opal (white) carnalian and agate.
$∴$ Agate is $S i O_{2}$ .

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Similar questions

List I	List II
A. Calcination	a. $2 {C u}_{2} S + 3 O_{2} \to 2 {C u}_{2} O + 2 S O_{2}$
B. Roasting	b. ${F e}_{2} O_{3} \cdot n H_{2} O \to {F e}_{2} O_{3} + n H_{2} O$
C. Flux	c. ${C r}_{2} O_{3} + 2 A l \to {A l}_{2} O_{3} + 2 C r$
D. Thermite	d. $S i O_{2} + F e O \to F e S i O_{3}$

Match the following.

Q. Bauxite ore is made up of

{A l}_{2} O_{3} + S i O_{2} + T i O_{2} + {F e}_{2} O_{3}

. This ore is treated with conc.

N a O H

500 K

35

bar pressure for few hours and filtered, the species present are:

Q. In aluminium extraction by the Bayer process, alumina is extracted from bauxite by sodium hydroxide at high temperatures and pressures.

{A l}_{2} O_{3} (s) + 2 O H^{-} (a q) \to 2 A l O_{2}^{-} (a q) + H_{2} O (l)

Solid impurities such as

{F e}_{2} O_{3}

S i O_{2}

are removed and then

A l {(O H)}_{4}^{-}

is reprecipitated

2 A l {(O H)}_{4}^{-} ⟶ {A l}_{2} O_{3} \cdot 3 H_{2} O (s) + 2 O H_{(a q)}^{-}

.
In the industrial world __________.

Q. The Gibbs energy for the decomposition of

{A l}_{2} O_{3}

500^{o} C

\frac{2}{3} {A l}_{2} O_{3} \to \frac{4}{3} A l + O_{2}; Δ_{r} G = + 96 k J

The voltage needed for the electrolytic reduction of aluminium oxide (

{A l}_{2} O_{3}

500^{o} C

Q. The Gibbs' energy for the decomposition of

{A l}_{2} O_{3}

500^{o} C

\frac{2}{3} {A l}_{2} O_{3} \to \frac{4}{3} A l + O_{2}; Δ_{r} G = + 960 k J {m o l}^{- 1}

The potential difference needed for the electrolytic reduction of aluminium oxide

({A l}_{2} O_{3})

500^{o} C

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