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CBSE

Chemistry

NEET Chemistry : General Principles And Processes of Isolation Of Elements

61.

Thermite is a mixture of iron oxide and :

62.

The composition of carnalite is

63.

In the extraction of copper from sulphide ore the metal is formed by reduction of Cu₂O with

64.

Which of the following is not an ore of iron ?

65.

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

${Al}_{2} O_{3} (s) + 2 {OH}^{-} (aq) \to 2 {Al}_{2} O_{2}^{-} (aq) + H_{2} O (l)$

Solid impurities such as Fe₂O₃ and SiO₂ are removed and then Al(OH)₄^- is reprecipitated

$2 Al (OH)_{4}^{-} \to {Al}_{2} O_{3} \cdot 3 H_{2} O (s) + 2 {OH}^{-} (aq) .$ In the industrial world

66.

Roasted copper pyrite on smelting with sand produces

67.

Which is the chief ore of copper?

68.

Prepare CuSO₄.5H₂O starting from copper pyrites.

69.

Extraction of gold (Au) involves the formation of complex ions X and Y.

Gold ore $\to_{{CN}^{-}, H_{2} O, O_{2}}^{Roasting}$ HO^- + X $\overset{Zn}{\to}$ Y + Au

X and Y respectively are

70.

Which of the following metals has the largest abundance in the earth's crust?

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