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CBSE

Chemistry

NEET Chemistry : General Principles And Processes of Isolation Of Elements

61.

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

62.

Thermite is a mixture of iron oxide and :

63.

Which is the chief ore of copper?

64.

Prepare CuSO₄.5H₂O starting from copper pyrites.

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.

Which of the following is not an ore of iron ?

67.

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

68.

Roasted copper pyrite on smelting with sand produces

69.

The composition of carnalite is

70.

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

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