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A sample of river water does not give la...

A sample of river water does not give lather with soap easily when it is cold, but on heating gives ready lather with soap. Why?

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Soap does not give lather with hard water. Why?

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V PUBLICATION-HYDROGEN-QUESTION BANK
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  2. Is it correct to say that hydrogen can behave as a metal? State the co...

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  3. A sample of river water does not give lather with soap easily when it ...

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  4. Statues coated with white lead on long exposure to atmosphere turn bla...

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  5. What is water gas? How is it prepared?

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  6. Boiling point of H2O (373K) is very much higher than that of H2S (213 ...

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  7. A mixture of hydrazine and 'H2 O2' with Cu(II) catalyst is used as a r...

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  8. Explain the following statements giving appropriate reasons. i) Sea w...

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  9. Hydrogen forms three type of bonds in its compounds. Describe each typ...

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  10. Name one example of a reaction in which dihydrogen acts as (i) an oxid...

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  11. a) Compare atomic hydrogen with nascent hydrogen.

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  12. Anhydrous 'BaO2' is not used for preparing 'H2 O2 .' Why?

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  13. Hydrogen forms compounds with elements having atomic number '9,11,12' ...

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  14. H2S is a gas at ordinary condition, while H2O is liquid. Account for t...

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  15. Why hard water is not used in industrial boilers for producing steam?

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  16. Outline the similarities of hydrogen with the 1st.group elements

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  17. In a science fair, a debate based on 'Position of Hydrogen in the peri...

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  18. In nuclear reactors, heavy water is used as 'moderator'. a. What is a...

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