Which of the following mixtures are correctly classified as homogeneous (Hm) and heterogeneous (Ht)? Choose the correct option.
(a) Air — Hm, Milk — Ht, Sugar solution — Hm, Smoke — Hm
(b) Brass — Ht, Fog — Ht, Vinegar — Ht, Muddy water — Hm
(c) Copper sulfate solution — Hm, Salt solution — Hm, Milk — Hm, Bronze — Hm
(d) Muddy water — Ht, Milk — Ht, Blood — Ht, Brass — Hm
(d) Muddy water — Ht, Milk — Ht, Blood — Ht, Brass — Hm
Explanation: A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture does not. Muddy water is a suspension in which mud particles remain suspended and settle over time, while milk and blood are colloids with fine particles dispersed in a liquid medium. Hence, muddy water, milk, and blood are all heterogeneous mixtures. Brass, on the other hand, is homogeneous, as it is an alloy of copper and zinc with a uniform composition throughout.
