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Write the equations for the following an...

Write the equations for the following and balance them
Ammonium dichromate on heating decomposes into chromium oxide, water vapour and nitrogen.

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ICSE-SPECIMEN PAPER 3-SECTION II
  1. Write the equations for the following and balance them Ammonium dich...

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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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