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Give reasons for the following Dilute ...

Give reasons for the following
Dilute hydrochloric acid reacts with magnesium liberating hydrogen, but the same is not liberated when the acid reacts with copper.

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ICSE-SPECIMEN PAPER 3-SECTION II
  1. Give reasons for the following Dilute hydrochloric acid reacts with ...

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  2. Copper sulphate crystals are heated strongly in a hard glass test tube...

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  3. What do you understand by Hard water

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  4. What are the causes for Permanent hardness

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  5. Explain one method of removing permanent hardness.

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  6. Give the equation for the lab preparation of hydrogen.

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  7. Why the solid reactant is used in granulated form ?

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  8. How is the gas recognised ?

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  9. Mention any two impurities present in hydrogen prepared in laboratory.

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  10. How are these impurities removed ?

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  11. State three precautions taken in preparing hydrogen.

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  12. Give three main characteristics of representative elements.

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

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

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

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

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

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

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

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

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

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