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CBSE

Chemistry

NEET Chemistry : General Principles And Processes of Isolation Of Elements

61.

Which is the chief ore of copper?

62.

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

63.

Roasted copper pyrite on smelting with sand produces

64.

Prepare CuSO₄.5H₂O starting from copper pyrites.

65.

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

66.

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

67.

Which of the following is not an ore of iron ?

68.

The composition of carnalite is

69.

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

70.

Thermite is a mixture of iron oxide and :

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