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Latihan 10 soal

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A dry colourless gas X may contain one or more of

\mathrm{NH_3}

\mathrm{HCl}

\mathrm{CO_2}

and

\mathrm{H_2}

. The following experiments are carried out:
(1) X is passed through concentrated sulfuric acid; the gas volume decreases markedly.
(2) The remaining gas is passed through excess limewater; no cloudiness appears.
(3) The remaining gas is passed in turn through concentrated sulfuric acid, hot

\mathrm{CuO}

and anhydrous

\mathrm{CuSO_4}

; the black solid turns red and the white powder turns blue.
Which conclusion about X is correct? ( ).

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