Class 11th| Chemistry Viva -Voce Question and Answers 2021 sesion

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Q1. What is the Function of seeding in the preparation of crystals?

Ans. Seeding facilitates the process of crystallization.

Q2. What happens when a hot solution of a salt is allowed to cool very slowly?

Ans. Crystals separate out and grow in size slowly.

Q3. Why is excess of sulphuric acid avoided in the crystallization of copper sulphate?

Ans. It will decrease the yelid of copper and sulphate.

Q4. What is Characteristic of crystals?

Ans. Crystals have well defined geometry and shape .

Q5. Why is crystallisation done?

Ans. Crystallisation enables to prepare a substance in state of higest purity.

Q6.What is blue vitrol?

Ans. Hydrated from of copper sulphate i.e. CUSO⁴.5H²O.

Q7. What will be the shape of copper sulphate?

Ans. Triclinic shape.

Q8. What is seeding ?

Ans. Addition of pure crystal in very small amount in the concentrated solution during crystallisation is called seeding.

Q9. Wat is crystallization point?

Ans. When the formation of crystals starts in the saturated solution of the substance on heating ia known as crystallization point.

Q10. How does the crystallization point checked in a solution?

Ans. Dip one end of the glass rod in the solution and blowing air over the glass rod, solid crystals stick on it, indicates crystallization point.

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