UPSC NDA I 2011 General Ability Paper

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Question : 113 of 150

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A student heated some sulphur in a spatula and collected the gas ' X '. Which one among the following is correct about ' X '?

X is SO2 and it turns moist litmus to blue
X is SO3 and it turns moist litmus to red
X is SO2 and it turns moist litmus to red
X is SO3 and it turns dry litmus to blue

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