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Question
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
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Answer
Option
(iv)
— Muddy water: Ht, Milk: Ht, Blood: Ht, Brass: Hm.
Explanation
| Mixture | Type | Reason |
|---|---|---|
| Muddy water | Ht | It is a suspension — the particles are visible and they settle |
| Milk | Ht | It is a colloid, and every colloid is heterogeneous |
| Blood | Ht | It is a colloid too — cells dispersed in plasma |
| Brass | Hm | It is an alloy, and an alloy is a homogeneous mixture |
Why the other options are wrong
- Option (i) calls smoke Hm , but smoke is solid particles suspended in air, which is heterogeneous.
- Option (ii) calls brass Ht , but an alloy is homogeneous. It also mishandles vinegar, which is Hm, and muddy water, which is Ht.
- Option (iii) calls milk Hm , but milk is a colloid and therefore heterogeneous.
Suspensions and colloids are always Ht; alloys and true solutions are Hm.
← Back to: 5.4.4 Colloids
