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JEE Advanced 2017Paper 2
Exam
JEE Advanced
Year
2017
Paper
Paper 2
Subject
Chemistry
Chapter
Hydrogen

JEE Advanced 2017 · Paper 2 · Chemistry · Hydrogen

Which of the following combinations will produce H _ 2 gas?

Which of the following combinations will produce H2{\text{H}}_{2} gas?

Options

  1. AZn metal and $\text{N}\text{a}\text{O}\text{H}\left(\text{a}\text{q}\right)
  2. BAu metal and NaCN(aq)\text{N}\text{a}\text{C}\text{N}\left(\text{a}\text{q}\right) in the presence of air
  3. CCu metal and conc. HNO3\text{H}\text{N}{\text{O}}_{3}
  4. DFe metal and conc. HNO3\text{H}\text{N}{\text{O}}_{3}

Correct answer

A. Zn metal and $\text{N}\text{a}\text{O}\text{H}\left(\text{a}\text{q}\right)

Step-by-step solution

(i) Zn+2NaOH→Na2ZnO2+H2\text{Z}\text{n} + 2\text{N}\text{a}\text{O}\text{H} \to \text{N}{\text{a}}_{2}\text{Z}\text{n}{\text{O}}_{2} + {\text{H}}_{2}
(ii) 4Au+8NaCN+O2+2H2O→4Na[Au(CN)2]+4NaOH4\text{A}\text{u} + 8\text{N}\text{a}\text{C}\text{N} + {\text{O}}_{2} + 2{\text{H}}_{2}\text{O} \to 4\text{N}\text{a}\left[\text{A}\text{u}{\left(\text{C}\text{N}\right)}_{2}\right] + 4\text{N}\text{a}\text{O}\text{H}
(iii) {Cu+4HNO3→Cu(NO3)2+2NO2+2H2O(conc.)\begin{cases}\text{C} \text{u} & + & 4 \text{H} \text{N} {\text{O} }_{3} & \to & \text{C} \text{u} {\left(\text{N} {\text{O} }_{3}\right)}_{2} & + & 2 \text{N} {\text{O} }_{2} & + 2 {\text{H} }_{2} \text{O} & \\ & & \left(\text{conc.}\right) & & & & & & \end{cases}
(iv) Formation of passive layer of Fe2O3\text{F}{\text{e}}_{2}{\text{O}}_{3} on the surface of Fe and NO2\text{N}{\text{O}}_{2} gas is evolved.
Fe+4HNO3→Fe(NO3)3+NO2+12O2\text{F}\text{e} + 4\text{H}\text{N}{\text{O}}_{3} \to \text{F}\text{e}{( \text{N}{\text{O}}_{3} )}_{3} + \text{N}{\text{O}}_{2} + \dfrac{1}{2} {\text{O}}_{2}
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