Which row correctly identifies the gas? Options gas test observation --- --- --- --- A $\text{Cl}_2$ damp litmus paper the litmus paper turns blue B $\text{NH}_3$ damp litmus paper the litmus paper turns red C $\text{O}_2$ limewater no change is observed D $\text{SO}_2$ acidified aqueous potassium manganate(VII) the colour of the solution changes from purple to colourless

Chemistry 5070/12 — May/June 2016

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Topics Atoms, Elements and Compounds · Metals · Organic Chemistry · Chemical Reactions · Acids, Bases and Salts · Chemistry of the Environment · +6 more

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Q11MExperimental Techniques and Chemical AnalysisFree sample

Which row correctly identifies the gas?

Options

	gas	test	observation
A	$\text{Cl}_2$	damp litmus paper	the litmus paper turns blue
B	$\text{NH}_3$	damp litmus paper	the litmus paper turns red
C	$\text{O}_2$	limewater	no change is observed
D	$\text{SO}_2$	acidified aqueous potassium manganate(VII)	the colour of the solution changes from purple to colourless

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