Neco 2020 Chemistry Question 8

Practice objective / multiple choice question 8 from the 2020 Neco Chemistry examination.

Neco 2020 Chemistry Objective / Multiple Choice Hard Difficulty
Question 8 NECO • 2020 • CHEMISTRY • objective

Element X exists in two allotropes, A and B.\nAllotrope A is a yellow solid that sublimates at \(150^{\circ}\mathrm{C}\) and reacts with hot concentrated \(\mathrm{H_2SO_4}\) to evolve a colourless gas.\nAllotrope B is a colourless gas at room temperature, condenses to a colourless liquid at \(-10^{\circ}\mathrm{C}\), and reacts with aqueous \(\mathrm{NaOH}\) to give a colourless solution and a white precipitate that dissolves on heating.\n(a) Identify element X and its two allotropes.\n(b) Write the balanced chemical equation for the reaction of allotrope A with hot concentrated \(\mathrm{H_2SO_4}\).

Answer Options

A. Element X is sulphur; allotrope A = solid sulphur (S₈), allotrope B = hydrogen sulfide (H₂S). Balanced equation: \\ (\\mathrm{S + H_2SO_4 \\rightarrow SO_2 + H_2O}\\).
B. Element X is sulphur; allotrope A = solid sulphur (S₈), allotrope B = sulphur monoxide (SO). Balanced equation: \\ (\\mathrm{S + H_2SO_4 \\rightarrow SO + H_2O}\\).
C. Element X is sulphur; allotrope A = solid sulphur (S₈), allotrope B = sulphur trioxide (SO₃). Balanced equation: \\ (\\mathrm{S + 3\\,H_2SO_4 \\rightarrow 2\\,SO_3 + 3\\,H_2O}\\).
Correct Answer D. Element X is sulphur; allotrope A = solid sulphur (S₈), allotrope B = sulphur dioxide (SO₂). Balanced equation: \(\mathrm{S + 2\,H_2SO_4 \rightarrow 3\,SO_2 + 2\,H_2O}\).
Correct Answer
D
Correct Option:
Element X is sulphur; allotrope A = solid sulphur (S₈), allotrope B = sulphur dioxide (SO₂). Balanced equation: \(\mathrm{S + 2\,H_2SO_4 \rightarrow 3\,SO_2 + 2\,H_2O}\).

About This Question

This is Neco 2020 Chemistry Question 8. It is one of the objective questions from the 2020 Neco Chemistry examination.

Difficulty level: Hard .

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