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Question

On strong heating, sulphur burns in the air with blue flame and gives out:
  1. SO2
  2. SO3
  3. none of the above
  4. both A and B

A
SO2
B
none of the above
C
SO3
D
both A and B
Solution
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Sulfur burns with a blue flame concomitant with the formation of sulfur dioxide notable for suffocating odor. The principal sulfur oxides are sulfur dioxide and sulfur trioxide.

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