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Air and Atmosphere — CHEMISTRY STD 7 — Question

ICSE BoardEnglish MediumSTD 7CHEMISTRYAir and Atmosphere2 Marks
Question
Give tests for oxygen gas.
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Answer

Tests for oxygen gas are :
  • It rekindles glowing wooden splinter.
  • If mixed with colourless nitric oxide gas, it forms reddish brown fumes of nitrogen dioxide.
  • It dissolves in alkaline pyrogallol solution and turns it brown.

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