Elements Q and R both burn in air.
The oxides formed both dissolve in water.
The solution of the oxide formed from element Q turns Universal Indicator red.
The solution of the oxide formed from element R turns Universal Indicator blue.
What are Q and R?
1 )
Q: carbon / R: sulfur
2 )
Q: sodium / R: magnesium
3 )
Q: sodium / R: sulfur
Q: sulfur / R: sodium
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