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What are physical and chemical changes ?...

What are physical and chemical changes ? How will you distinguish between them ?

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DINESH PUBLICATION-IS MATTER AROUND US PURE-Long Answer Questions
  1. You are given a mixture of sand, water and mustard oil. How will you s...

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  2. Sudha tested the solubility of four salts X, Y, Z and T as different t...

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  3. (a) Enumerate any two differences between simple distillation and frac...

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  4. Why is crystallisation better than evaporation for the separation of m...

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  5. Which separation techniques you will apply for the separation of the f...

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  6. (a) 'Water is considered as a compound of hydrogen and oxygen and not ...

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  7. How will you separate a mixture containing kerosene and petrol (differ...

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  8. Explain the terms dilute solution, concentrated solution and saturated...

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  9. Observe the apparatus shown and answer the following questions. (a...

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  10. What is chromatography ? State its two applications.

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  11. (a) Compare metals and non-metals based on their physical properties (...

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  12. List four physical properties of metals. Name two metals. Name a metal...

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  13. How will you purify an impure sample of copper sulphate containing som...

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  14. Give the main points of distinction in true solution, colloidal soluti...

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  15. What is Tyndall effect ? How does it help in noticing the particles pr...

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  16. A mixture of acetone and methanol can be separated by

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  17. What are physical and chemical changes ? How will you distinguish betw...

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  18. A mixture whether homogeneous or heterogeneous cannot be a pure substa...

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  19. Calculate the mass of sulphuric acid required to prepare its 20% (mass...

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  20. A mixture of alcohol and water is called a true solution while that of...

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