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    Home » When Conc. H2SO4 was added to an unknown salt in a test tube, and a brown gas (A) was evolved. This gas intensified when copper turnings were added to the test tube. On cooling gas (A) changed into a colorless gas (B). Identify the gases ‘A’ and ‘B’. Write the equations for the reactions involved.

    When Conc. H2SO4 was added to an unknown salt in a test tube, and a brown gas (A) was evolved. This gas intensified when copper turnings were added to the test tube. On cooling gas (A) changed into a colorless gas (B). Identify the gases ‘A’ and ‘B’. Write the equations for the reactions involved.

    Dr. Vikas JasrotiaBy Dr. Vikas JasrotiaOctober 19, 2022No Comments
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    Que: When Conc. H2SO4 was added to an unknown salt in a test tube, and a brown gas (A) was evolved. This gas intensified when copper turnings were added to the test tube. On cooling gas (A) changed into a colorless gas (B). Identify the gases ‘A’ and ‘B’. Write the equations for the reactions involved.
    Ans: The brown gas (A) is nitrogen dioxide (NO2​). Salt reacts with conc. Sulphuric acid forms brown fumes of nitrogen dioxide.
    MNO3​ + H2​SO4 ​→ MHSO4 ​+ HNO3​
    4HNO3​ → 4NO2​↑ + O2​ + 2H2​O
    The fumes intensify when copper turnings are added.
    3Cu + 8HNO3 ​→ 3Cu(NO3​)2 ​+ 2NO↑ + 4H2​O
    2NO + O2​ → 2NO2​
    At low temperatures, odd electron, brown-colored NO2​ gas dimerizes to colorless gas N2​O4​.
    NO2​ is paramagnetic and N2​O4​ is diamagnetic.
    2NO2​ ⇌​ N2​O4​

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