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MBD-IS MATTER AROUND US PURE-Example
- 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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- Give examples of non-metals.
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- Give examples for metals.
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- How many elements are known till today ?
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- How many elements occur in nature ?
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- How many elements are gases at room temperature ?
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- Name five methods to separate mixtures,
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- How are sugar crystals separated in a sugar factory ?
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- The size of colloidal particals is in the range........ .
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- Tyndall effect is shown by .... .
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- He and Ne are..... gases.
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- FeS + H2SO4 rarr
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- In a refinery, petrol is obtained from crude oil by the process of ......
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- Grass stains are removed from the clothing by using .... as solvent.
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- Common salt is obtained from sea water by the process of....... .
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- When caustic soda solution is added to an aqueous solution of coppe...
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