1
JEE Main 2023 (Online) 1st February Evening Shift
Numerical
+4
-1
Change Language

Among following compounds, the number of those present in copper matte is ___________.

A. $$\mathrm{CuCO_{3}}$$

B. $$\mathrm{Cu_{2}S}$$

C. $$\mathrm{Cu_{2}O}$$

D. $$\mathrm{FeO}$$

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2
JEE Main 2023 (Online) 24th January Evening Shift
Numerical
+4
-1
Change Language

The number of statement/s, which are correct with respect to the compression of carbon dioxide from point (a) in the Andrews isotherm from the following is ___________

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Isolation of Elements Question 3 English

A. Carbon dioxide remains as a gas upto point (b)

B. Liquid carbon dioxide appears at point (c)

C. Liquid and gaseous carbon dioxide coexist between points (b) and (c)

D. As the volume decreases from (b) and (c), the amount of liquid decreases

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3
JEE Main 2022 (Online) 27th July Evening Shift
Numerical
+4
-1
Change Language

Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, Limonite, Cryolite, the number of principal ores if iron is _____________.

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4
JEE Main 2022 (Online) 30th June Morning Shift
Numerical
+4
-1

Blister copper is produced by reaction of copper oxide with copper sulphide.

2Cu2O + Cu2S $$\to$$ 6Cu + SO2

When 2.86 $$\times$$ 103 g of Cu2O and 4.77 $$\times$$ 103 g of Cu2S are used for reaction, the mass of copper produced is _____________ g. (nearest integer)

(Atomic mass of Cu = 63.5 a.m. u, S = 32.0 a.m. u, O = 16.0 a.m. u)

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