Which of the following is the best example of a heterogeneous mixture?
Sand and iron filings
A heterogeneous mixture is one whose composition is not uniform throughout, so its different components can be seen as separate parts and remain distinguishable, often even with the naked eye.
In a mixture of sand and iron filings, the grains of sand and the pieces of iron stay separate and can be seen individually; the iron can even be pulled out with a magnet. So this mixture is clearly non-uniform, that is, heterogeneous.
Salt water is a solution in which salt is evenly dissolved, vinegar is a uniform solution of acetic acid in water, and air is a uniform mixture of gases. All three are homogeneous mixtures, not heterogeneous ones.
Hence, Sand and iron filings.
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Important Questions from Basic Concepts of Chemistry
Which of the following pair is correct?
I. Isotopes – different mass numbers
II. Isobars – different atomic numbers
Which of the following is a zone of a flame?
I. Dark
II. Luminous
III. Non-Luminous
If formula of sodium salt of an anion X is \(Na_2X\) , then the formula of its aluminium salt would be
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B. 1 gram CO 2, 1 gram N 2O
C. 1 gram O 2, 1 gram O 3
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