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Give the physical state of the last grou...

Give the physical state of the last group members of the modern periodic table. State their valency.

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ICSE-SPECIMEN PAPER 3-SECTION II
  1. State three precautions taken in preparing hydrogen.

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  2. Give three main characteristics of representative elements.

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  3. Give the physical state of the last group members of the modern period...

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  4. Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Whi...

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  5. Account for the following : Though lead is above hydrogen in the act...

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  6. Account for the following : Potassium and sodium are not used to rea...

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  7. Account for the following : Isotopes of an element possess identical...

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  8. Distinguish by flame test : Sodium chloride and potassium chloride.

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  9. State the effect of temperature on solubility of the following: Calc...

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  10. State the effect of temperature on solubility of the following: Pota...

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  11. State the effect of temperature on solubility of the following: Sodi...

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  12. Define 'decomposition reaction'. Write an equation in each case Ther...

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  13. Define 'decomposition reaction'. Write an equation in each case Deco...

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  14. Elements A, B and C have atomic numbers 9, 10 and 20 respectively. Sta...

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  15. Reactions can be classified as follows: Direct combination, decompos...

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  16. Reactions can be classified as follows: Direct combination, decompos...

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  17. Reactions can be classified as follows: Direct combination, decompos...

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  18. Reactions can be classified as follows: Direct combination, decompos...

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  19. Reactions can be classified as follows: Direct combination, decompos...

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  20. Name the substance responsible for the depletion of ozone layer.

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