Classification of Matter & Mixture

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1. 
The purity of milk is determined by-

2. 
What is centrifugation used for?

3. 
Which one among the following statements about an atom is not correct?

4. 
When the milk is churned vigorously the cream from it is separated out due to-

5. 
Who first used the term "element"?

6. 
How many elements are naturally occurring?

7. 
Iodine can be separated from a mixture of iodine and potassium chloride by-

8. 
Who defined an element as a basic form of matter?

9. 
How many elements are there today?

10. 
For an ideal gas, which one of the following statements is not true?

11. 
What is a homogeneous mixture?

12. 
Glass is-

13. 
Which are homogeneous mixtures of two or more components ?

14. 
Which of the following is used to remove the green colour from glass?

15. 
A molecule of a substance is similar to its atom for-

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