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Standard X
Chemistry
Silver Nitrate Test
Question

The black powder which gives greenish yellow gas when heated with conc. hydrochloric acid is :
  1. cuprous oxide
  2. lead oxide
  3. coal
  4. manganese dioxide

A
cuprous oxide
B
coal
C
lead oxide
D
manganese dioxide
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Solution
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Manganese dioxide when heated with conc. HCl gives a greenish-yellow gas. This gas produced is chlorine gas.

MnO2+4HClHeat−−−→MnCl2+2H2O+Cl2(g)conc.

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