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Cobalt chloride is blue in anhydrous st...

Cobalt chloride is blue in anhydrous state . In contact with water vapours it turns

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CHHAYA PUBLICATION-HYDROGEN-WARM UP EXERCISE
  1. How will you prove that a colourless liquid is water?

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  2. Indicate whether water undergoes oxidation or reduction during photos...

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  3. Cobalt chloride is blue in anhydrous state . In contact with water va...

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  4. What is heavy water? Why it is called so? State the major source of he...

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  5. All physical constants of heavy water are higher than the correspondin...

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  6. What amount of water should be electrolysed to get 1L of 99% pure D(2)...

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  7. Why concentration of D(2)O increases when electrolysis of water is car...

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  8. Explain why the reactions of D(2) O occur at a rate slower that the co...

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  9. How would you prepare deuterium peroxide (D(2)O(2)) ?

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  10. How will you prepare deuteroammonia (ND(3)) from N(2) ?

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  11. Write down two important uses of heavy water.

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  12. How will you prove that hypophoshporus acid (H(3)PO(2)) is a monobasic...

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  13. Sodium chloride is less soluble in heavy water than ordinary water-why...

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  14. Why is heavy water (D(2)O) injurious to human beings, animals and pla...

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  15. Some H(2)SO(4) has been added to distilled water. Explain whether this...

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  16. Explain why lather is not formed when soap is used in hard water.

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  17. It is better to use detergent than soap in hard water - explain why.

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  18. What do you understand by the term softening of hard water?

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  19. What is calgon? Which ions are rendered ineffective by calgon thereby ...

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  20. Temporary hardness caused by Mg(HCO(3))(2) cannot be removed completel...

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