Question

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Answer 1

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Solution 1.

a) Here B = Lithium, Li

• No. of Electrons in B+ = 2
• No. of Protons in B+ = 3

b) Here, Elements C and D are having same atomic no. 17

=》C and D are isotopes.....

c) Here, D = Argon, Ar

• No. of Electrons in D²- = 20
• No. of Protons in D²- = 18
• No. of Neutrons in D²- = 22

Solution 2.

a) Iodine from common salt

• Method - Sublimation
• Since iodine is sublimable, it will change to vapour state directly from solid when heated slightly and the iodine vapours can be collected while common salt remains as such.

b) Pigment from an extract of flower petal

• Method - Chromatography
• Chromatography is a technique of separation of substances which are very close in their molecular weight but differ in their molecular sizes.

c) Oil from water

• Method - Gravity Separation
• Two immiscible liquids, oil and water, can be separated by using Separating Funnel. The process involves using the mixtures of unequal particle density. Because water is denser than oil, it can be separated by means of the funnel and left in the funnel with an oil layer.

(Remember :- The process is gravity separation and device used is Separating funnel.)

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