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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
s Block Elements

NTA Abhyas 2020 · Chemistry · s Block Elements

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

Which of the following combination will produce H2{H}_{2} gas?

Options

  1. AFe metal and conc. HNO3HN{O}_{3}
  2. BCu metal and conc. HNO3HN{O}_{3}
  3. CAu metal and NaCN(aq) in the presence of air
  4. DZn metal and NaOH(aq)

Correct answer

D. Zn metal and NaOH(aq)

Step-by-step solution

Fe+conc.HNO3→PassivityFe + conc. HN{O}_{3} \to Passivity

Cu+conc.HNO3→NO2Cu + conc. HN{O}_{3} \to N{O}_{2}

Au+NaCN+O2→[Au(CN)2]−Au + NaCN + {O}_{2} \to [ Au ( CN{)}_{2}{]}^{-}

Zn+NaOH→Na2ZnO2+H2Zn + NaOH \to N{a}_{2}Zn{O}_{2} + {H}_{2}
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