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A compound when treated with concentrated hydrochloric acid gives off a green gas which bleaches moist red litmus paper. The gas given off is $1$ hydrogen sulphide$\newline$$2$ chlorine$\newline$$3$ sulphur dioxide$\newline$$4$ nitrogen dioxide$\newline$$1$$\newline$$2$$\newline$$3$$\newline$$4$$\newline$Clear selection