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Account for the following : Potassium ...

Account for the following :
Potassium and sodium are not used to react with dil. HCI or dil. `H_(2)SO_(4)` in the lab. preparation of hydrogen

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Give reason for the following: Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.

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Why are the following metals not used in the lab. Preparation of hydrogen? sodium

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ICSE-SPECIMEN PAPER 3-SECTION II
  1. Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Whi...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  18. Give an example of an endothermic reaction.

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  19. Distinguish : zinc nitrate and lead nitrate, by heating.

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  20. Complete the following equations and state in each case if the reactio...

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