JEE Advanced2017ChemistryHydrogenActual

Which of the following combinations will produce H 2 gas?

Options

AZn metal and N a O H a q
BAu metal and N a C N a q in the presence of air
CCu metal and conc. H N O 3
DFe metal and conc. H N O 3

Correct answer

A. Zn metal and N a O H a q

Step-by-step solution

(i) Z n + 2 N a O H → N a 2 Z n O 2 + H 2 (ii) 4 A u + 8 N a C N + O 2 + 2 H 2 O → 4 N a A u C N 2 + 4 N a O H (iii) C ⁡ u ⁡ + 4 H ⁡ N ⁡ O ⁡ 3 → C ⁡ u ⁡ N ⁡ O ⁡ 3 2 + 2 N ⁡ O ⁡ 2 + 2 H ⁡ 2 O ⁡ conc. (iv) Formation of passive layer of F e 2 O 3 on the surface of Fe and N O 2 gas is evolved. F e + 4 H N O 3 → F e ( N O 3 ) 3 + N O 2 + 1 2 O 2

Practice Hydrogen on Quantrex Academy →

More from Hydrogen

The mass of iron converted into Fe₃O₄ by the action of 18 g of steam is : (Given : Molar mass of H, O and Fe are 1 , 16 and 56 g mol ⁻¹ respectively) Assume iron is present in exce 2026 During water-gas shift reaction 2023 Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Isotopes of hydrogen have almost same chemical properties, but d 2023 Given below are two statements: Statement I: Permutit process is more efficient compared to the synthetic resin method for the softening of water. Statement II: Synthetic resin met 2023 Match List I with List II List I Type of Hydride List II Example A Electron deficient hydride I MgH 2 B Electron rich hydride II HF C Electron precise hydride III B 2 H 6 D Saline 2023 Which hydride among the following is less stable? 2023 Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R . Assertion A : Physical properties of isotopes of hydrogen are different. Reas 2023 Given below are two reactions, involved in the commercial production of dihydrogen H 2 . The two reactions are carried out at temperature “ T 1 ” and “ T 2 &rdquo 2023 Full Hydrogen list All JEE Advanced PYQs