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Which of the following mixtures are correctly classified as homogeneous (Hm) and heterogeneous (Ht)? Choose the correct option.
(i) Air — Hm, Milk — Ht, Sugar solution — Hm, Smoke — Hm
(ii) Brass — Ht, Fog — Ht, Vinegar — Ht, Muddy water — Hm
(iii) Copper sulfate solution — Hm, Salt solution — Hm, Milk — Hm, Bronze — Hm
(iv) Muddy water — Ht, Milk — Ht, Blood — Ht, Brass — Hm
(i) Air — Hm, Milk — Ht, Sugar solution — Hm, Smoke — Hm
(ii) Brass — Ht, Fog — Ht, Vinegar — Ht, Muddy water — Hm
(iii) Copper sulfate solution — Hm, Salt solution — Hm, Milk — Hm, Bronze — Hm
(iv) Muddy water — Ht, Milk — Ht, Blood — Ht, Brass — Hm
View Answer
The correct option is (iv).
Muddy water, milk and blood are all heterogeneous (milk and blood are colloids, muddy water a suspension), and brass is a homogeneous alloy. The other options wrongly label one or more mixtures — for example, smoke is heterogeneous, not Hm, and muddy water is Ht, not Hm.
Homogeneous (Hm)
Heterogeneous (Ht)
Brass — an alloy, uniform throughout
Muddy water — a suspension, sand settles
Bronze, sugar solution, vinegar, salt solution
Milk and blood — colloids
Air — a uniform mixture of gases
Smoke and fog — particles/droplets in gas
Copper sulfate solution
⇒ option (iv) is the only fully correct row
