Dissolving 1.24 g of white phosphorous in boiling NaOH solution in an inert atmosphere gives a gas Q. The amount of (in g) required to completely consume the gas Q is _____.
[Given: Atomic mass of H = 1, O = 16, Na = 23, P = 31, S = 32, Cu = 63]
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JEE Advanced 2022 · Paper 1, Chemistry question 5
Answer and worked solution
Official answer: 2.37
The gas. (): 1.24 g is 0.01 mol.
So Q is phosphine, 0.01 mol.
With copper sulphate.
This needs 0.015 mol (): g.