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Magnesium ribbon was allowed to burn inside a given gas P leaving a white solid residue ...

Magnesium ribbon was allowed to burn inside a given gas P leaving a white solid residue Q. Addition of water to Q liberated a gas which produced dense white fumes with a drop of hydrochloric acid. The gas P was?

A. nitrogen
B. chlorine
C. oxygen
D. sulphur (IV) oxide




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