8. A mixture of sand and NH4CI can be separated by method. 9. Define latent heat of fusion. Give its value for ice. 10. What is meant by atomicity of an element? Give some examples of polyatomic elements. 11. “All pure substances are homogenous. But all homogenous substances are not pure." Justify.

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Chapter1: Chemical Foundations
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8. A mixture of sand and NH,Cl can be separated by
method.
9. Define latent heat of fusion. Give its value for ice.
10. What is meant by atomicity of an element? Give
some examples of polyatomic elements.
11. “All pure substances are homogenous. But all
homogenous substances are not pure." Justify.
12. Distinguish between filtration and centrifugation.
13. Silver is a substance which expands on melting; so,
its melting point
when pressure is raised.
14. Give an example each for solid-liquid and solid-
solid types of a homogenous mixture.
15. The atomicity of the element phosphorus is
Transcribed Image Text:8. A mixture of sand and NH,Cl can be separated by method. 9. Define latent heat of fusion. Give its value for ice. 10. What is meant by atomicity of an element? Give some examples of polyatomic elements. 11. “All pure substances are homogenous. But all homogenous substances are not pure." Justify. 12. Distinguish between filtration and centrifugation. 13. Silver is a substance which expands on melting; so, its melting point when pressure is raised. 14. Give an example each for solid-liquid and solid- solid types of a homogenous mixture. 15. The atomicity of the element phosphorus is
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