The white of an egg, common salt, sugar and fine sand are added to water separately in beakers as shown below. The mixture is stirred well. A suspension will be formed in the beaker :

(1) I
(2) II
(3) III
(4) (IV)

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Solution

A heterogeneous mixture in which solute particles do not dissolve, but left suspended in the solution is known as suspension. So, out of given mixtures, I, II and III will completely mix in the solvent while only IV having sand will remain suspended in the solution.

Hence, the correct answer is option 4.

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A student added milk, white of an egg, common salt and sand separately to water kept in four separate beakers. He stirred the mixtures well and filtered each of them. On filtering, he obtained solid residue on the filter paper in case of :

Q. Four students took separately the mixture of sand, common salt and ammonium chloride in beakers, added water, stirred the mixture well and then filtered. They reported their observations as shown below.

Student	As residue	In the filtrate
I	Ammonium chloride	Sand Common salt
II	Common salt, Sand	Ammonium chloride
III	Sand, Ammonium chloride	Common Salt
IV	Sand	Ammonium chloride, Common salt