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B
Fe(s)
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C
CO2(g)
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D
NH3(l)
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E
NaCl(s)
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Solution
The correct option is B Kl(aq) CO2 and NH3 are a compound as it is made up of different elements.Fe(s) is a pure substance as it is made up of a single element.
NaCl is also a pure substance.NH3 is a compound as it is made up of different elements.
KI(aq) is a homogeneous mixture as its composition is uniform throughout the mixture.