Igcse Model Questions Vol1 2022 Chemistry Question 15

Practice objective / multiple choice question 15 from the 2022 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2022 Chemistry Objective / Multiple Choice Hard Difficulty
Question 15 IGCSE_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • objective

A piece of metal Z reacts with dilute hydrochloric acid according to \( \mathrm{Z + 2\,HCl \rightarrow ZCl_2 + H_2} \). When \(0.500\) g of Z is placed in excess HCl, \(0.225\) L of hydrogen gas is collected at \(25^{\circ}\)C and \(1.00\) atm. (a) Determine the molar mass of metal Z. (b) From the following options, identify Z: (i) Mg (24.3 g mol\(^{-1}\)), (ii) Zn (65.4 g mol\(^{-1}\)), (iii) Fe (55.8 g mol\(^{-1}\)), (iv) Al (27.0 g mol\(^{-1}\)). (c) Using the standard reduction potentials \(E^{\circ}_{\text{Mg}^{2+}/\text{Mg}} = -2.37\) V, \(E^{\circ}_{\text{Zn}^{2+}/\text{Zn}} = -0.76\) V, \(E^{\circ}_{\text{Fe}^{2+}/\text{Fe}} = -0.44\) V, \(E^{\circ}_{\text{Al}^{3+}/\text{Al}} = -1.66\) V, which metal would produce the greatest volume of hydrogen under the same conditions (0.500 g, same acid excess)? Explain.

Answer Options

A. (a) 48.6 g mol⁻¹; (b) Zn; (c) Magnesium would produce the greatest volume of H₂ because each mole of Mg yields 1 mol H₂ and its low molar mass gives the highest number of moles per 0.500 g.
B. (a) 58.2 g mol⁻¹; (b) Mg; (c) Zinc would produce the greatest volume of H₂ because each mole of Zn yields 1 mol H₂ and its moderate molar mass provides more moles per 0.500 g than Fe.
C. (a) 62.5 g mol⁻¹; (b) Al; (c) Iron would produce the greatest volume of H₂ because Fe has the lowest standard reduction potential among the listed metals.
Correct Answer D. (a) 54.4 g mol⁻¹; (b) Fe; (c) Aluminium would produce the greatest volume of H₂ because each mole of Al yields 1.5 mol H₂ and its low molar mass gives the highest number of moles per 0.500 g.
Correct Answer
D
Correct Option:
(a) 54.4 g mol⁻¹; (b) Fe; (c) Aluminium would produce the greatest volume of H₂ because each mole of Al yields 1.5 mol H₂ and its low molar mass gives the highest number of moles per 0.500 g.

About This Question

This is Igcse Model Questions Vol1 2022 Chemistry Question 15. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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