In give reasons answer 3 qiestion

In give reasons answer 3 qiestion •and is an which Of 3. and decantation are used separating 4. In the clear liquid at the in the contaiæ:r is E Give word GAIowing statements. I. Substances that have only one type of atoms t 2. Substances that have different types of atoms bound chemicaUy 3. Representation ofa compound using the symbols of dements along •sith the i atoms combine 4. The method of separation used separating wheat husk from dour SUBJECTIVE TYPE QUESTIONS A. Give reasons the 1. Noble gases are called inert gases. 2. Air is regarded as a mixture. 3. Sugar carft be separated from the sugar solution by the process of Answer the following questions in short. I. Miat are pure substances? 2. Write the symbols of the following elements: (a) Silicon (c) Potassium— f (e) Chlorine (b) Phosphoru (d)

Dear student,

Subjective type questions:
A.
(1)   Noble gases are inert because they have a full octet of electrons. In other words, there are not any valence electrons available for noble gas elements to react with other elements.  
(2)  A homogeneous mixture is that which has a uniform composition throughout. Air is a homogeneous mixture because it contains gaseous substances like oxygen, nitrogen and other gases present in small amounts uniformly distributed throughout it. So that's why air is considered as a homogeneous mixture. Hope you got the answer you needed.

(3)  Sugar cannot be separated from its solution by filtration because the sugar in water forms a clear homogeneous solution and they can not be separated by filtration. For filtration a heterogeneous solution is required, therefore sugar from its solution can be separated by evaporation.

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