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- What is the function of glass beads in fractionating column ?
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- Which type of mixture air is ?
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- What is the boiling point of oxygen ?
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- What is the boiling point of Argon.
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- What is the boiling point of nitrogen ?
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- When do we use crystallisation for purification ?
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- How will you get pure copper sulphate ?
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- Why is crystallisation better than simple distillation ?
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- How will you get pure water from sea water ?
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- How is alum purified ?
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- What are the changes during chemical change ?
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- Name the type of change of combustion ?
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- How is matter classified on the basis of chemical composition ?
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- Which French scientist proved that element is a fundamental or basic ...
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- Which is the basic unit of matter ?
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- Define an element.
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- How are elements classified ?
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- Name the metal which is liquid at room temperature
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- What is metalloid ?
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- Give two examples of metalloids.
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