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Give reason for the following: Dilute ...

Give reason for the following:
Dilute sulphuric acid cannot be replaced by concentrated acid in the preparation of hydrogen.

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Give reasons for the following : Conc . Sulphuric acid us used as a laboratory reagent in the preparation of iodine from hydrogen iodide.

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ICSE-STUDY OF THE FIRST ELEMENT - HYDROGEN-EXERCISE 6(B)
  1. Which test should be made before collecting hydrogen in a gas jar?

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  2. Why is nitric acid not used in the preparation of hydrogen?

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  3. Why is hot concentrated sulphuric acid not used in the preparation of ...

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  4. Hydrogen is prepared by Bosch process ? Write the balanced equations...

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  5. Hydrogen is manufactured by Bosch Process'. How can you obtain hydr...

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  6. Write balanced equations for the following reactions. Steam is passe...

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  7. Write equations for the reactions of (i) iron with steam (ii) calc...

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  8. A small piece of calcium metal is put into a small trough containing w...

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  9. A small piece of calcium metal is put into a small trough containing w...

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  10. A small piece of calcium metal is put into a small trough containing w...

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  11. Thin sprips of magnesium, copper and iron are taken. Write down what...

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  12. Thin sprips of magnesium, copper and iron are taken. Arrange these m...

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  13. Hydrogen is evolved by the action of cold dil. HNO3, on

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  14. Which metal produces hydrogen gas on reaction with cold water? (a) A...

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  15. The composition of the nucleus of deutrium is

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  16. Elements which show unique nature in the preparation of hydrogen are ...

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  17. Give reason for the following: Zinc granules are used in lab prepara...

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  18. Give reason for the following: Purified and dried hydrogen is collec...

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  19. Give reason for the following: The end of the thistle funnel should ...

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  20. Give reason for the following: Dilute sulphuric acid cannot be repla...

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