Answer: Option C. -> Sieving
:
C
Sievingis a method in which two or more components of different sizes are separated from a mixtureusing a sieve.A sieve has fine pores in it which let small-sized componentto pass through it but holdback larger sized components.

Answer: Option B. -> decantation
:
B
Decantation is a process to separate a mixture of solid and liquid or immiscible liquids. Oil is much less dense than water. It floats above the surface of water, when mixed together. Thus, they can be separated by decantation easily.

Answer: Option B. -> saturated
:
B
A solution is saturated when no more solute can be dissolved in it at a specific temperature.

Answer: Option B. -> Filtration
:
B
Chalk powder is insoluble in water. It can be separated through filtration using a filter paper. Chalk powder particles can not pass through it. So, it will be collected on filter paper and water in a container placed below.

:
Addition of ice: 1 Mark
Dissolving more sugar: 1 Mark
Solubility of different substances: 1 Mark
More salt: 1 Mark
Other water soluble things: 1 Mark
The sugar should be added before the ice.
We can dissolve more sugar in warm water since sugar dissolves in warm water more quickly than in cold water. So it's better to add the ice after adding sugar.
Water does not dissolve equal amounts of different substances. It will dissolve different amounts of salt and sugar.
To dissolve more salt in a saturated solution of salt and water, the salt solution can be heated to make room for more salt particles to dissolve.
Other water soluble things include coffee and soap.

:
Method: 1 Mark
Reason: 1 Mark
The best way to remove the Horlicks clumps is through filtration. While filtering the Horlicks solution, the powder clumps remain with the filter paper.
We choose filtration becauseHorlicks is a solution since it dissolves in milk.The dissolved particles of Horlicksgo through the filter paper along with milk, and the undissolved portion remains on the filter paper, getting us exactly what we need.

:
Explanation: 1 Mark each
We can separate them in various ways.
1. The mixture is taken and put into a beaker of water.
After a few seconds of stirring, since sugar is soluble in water, the sugar will dissolve into the water.
2. If the mixture is now left undisturbed for a few hours, the leftover pebbles from the mixture will form a sediment on the bottom of the beaker.
The top layer of clean water is transferred into another beaker.
3. We can also use filtration to remove the stones from the beaker instead of waiting for it to form a sediment.
4.The new solution is now heated to a boil and left to evaporate. After the water has evaporated, the sugar will remain behind in the beaker.
Thus the sugar and the stones are removed.
5. So while separating sugar from the stones, the various processes involved are sedimentation/filtration, decantation, and evaporation.

:
Sedimentation: 1 Mark
Decantation: 1 Mark
The process of separating insoluble substances which are heavier than liquid by allowing them to settle down on their own due to gravity is called sedimentation.
In decantation, the clear upper liquid is poured out from thecontainer without disturbing the sediment.

Answer: Option B. -> Filtration
:
The purpose to separate the components of a mixture are:
(i) To separate unwanted or non-useful substances from useful substances.
(ii) To separate two useful substances if we want to use them separately.

Answer: Option B. -> Filtration
:

The various factors which separation of substances depends on are:
i) Solubility
ii) Size of particles
iii) Weight of the particles
iv) Temperature difference in changing physical states