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NEET levelSingle correct optionDifficulty 1 of 3mt060

Which gas is liberated when galena, $PbS$ , is roasted in air?

A $H X_{2} S$
B $NO X_{2}$
C $CO X_{2}$
D $SO X_{2}$

Answer: D

On roasting, sulphur of the sulphide is oxidised:

2 PbS + 3 O X_{2} 2 PbO + 2 SO X_{2}

. The gas liberated is sulphur dioxide.

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