Neco 2025 Chemistry Question 31

Practice objective / multiple choice question 31 from the 2025 Neco Chemistry examination.

Neco 2025 Chemistry Objective / Multiple Choice Hard Difficulty
Question 31 NECO • 2025 • CHEMISTRY • objective

A non‑metal gas X reacts with excess chlorine gas at 298 K according to the equation \( \text{X} + \frac{n}{2}\,\text{Cl}_2 \rightarrow \text{XCl}_n \). The molar mass of the product XCl_n is found experimentally to be 102.9 g·mol\(^{-1}\). When one mole of X is reacted, the volume of chlorine gas consumed at STP is 22.4 L. Identify the element X, determine the value of n, and write the balanced chemical equation for the reaction.

Answer Options

Correct Answer A. X = sulfur (S); n = 2; balanced equation: S + Cl₂ → SCl₂
B. X = selenium (Se); n = 2; balanced equation: Se + Cl₂ → SeCl₂
C. X = phosphorus (P); n = 3; balanced equation: P + 3/2 Cl₂ → PCl₃
D. X = oxygen (O); n = 1; balanced equation: O + 1/2 Cl₂ → OCl
Correct Answer
A
Correct Option:
X = sulfur (S); n = 2; balanced equation: S + Cl₂ → SCl₂

About This Question

This is Neco 2025 Chemistry Question 31. It is one of the objective questions from the 2025 Neco Chemistry examination.

Difficulty level: Hard .

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