1
JEE Main 2022 (Online) 25th July Evening Shift
Numerical
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-1
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56.0 L of nitrogen gas is mixed with excess hydrogen gas and it is found that 20 L of ammonia gas is produced. The volume of unused nitrogen gas is found to be _________ L.

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2
JEE Main 2022 (Online) 25th July Evening Shift
Numerical
+4
-1
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A sample of 4.5 mg of an unknown monohydric alcohol, R-OH was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be 3.1 mL. The molecular weight of the unknown alcohol is __________ g/mol. [Nearest integer]

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3
JEE Main 2022 (Online) 30th June Morning Shift
Numerical
+4
-1
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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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4
JEE Main 2022 (Online) 28th June Evening Shift
Numerical
+4
-1
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The complete combustion of 0.492 g of an organic compound containing 'C', 'H' and 'O' gives 0.793 g of CO2 and 0.442 g of H2O. The percentage of oxygen composition in the organic compound is ______________. (nearest integer)

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