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What do you mean by 'black ash' ?...

What do you mean by 'black ash' ?

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A mixture of sodium carbonate `(Na_2CO_3)` and calcium sulphide (CaS) is called black ash.
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CHHAYA PUBLICATION-s-BLOCK ELEMENTS -QUESTION-ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE)
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  2. What is anhydrone?

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  3. How will you distinguish between BeSO4 & BaSO4 ?

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  4. Which out of MgCO3, SrCO3 and BaCO3, possesses highest thermal stabili...

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  5. Distinguish between Be(OH)2 and Ba(OH)2.

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  6. Why is BeCl2 soluble in organic solvent ?

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  7. Which Gr -2 metal carbonate is unstable in air ?

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  8. Which alkline earth metal sulphate is useful in diagonising stomach ul...

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  9. BeO is covalent but still it has much higher melting point - mention t...

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  10. Write a reaction by which BeCl2 can be prepared.

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  11. What is the composition of sodalime used for the preparation of hydroc...

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  12. Name two acidic oxides which react similarly with calcium hydroxide [C...

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  13. Which alkaline earth metal oxide is used as a flux in metallurgy to re...

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  14. What is the commercial name of the disinfectant powder obtained when C...

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  15. Plaster of paris is

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  16. What type of impurities in gypsum should be avoided in preparing Plast...

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  17. Why KNO3 is used instead of NaNO3 in gunpowder ?

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  18. What do you mean by 'black ash' ?

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  19. What happens when megnesium is hearted with acetylene of 875 K ?

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  20. Which calcium salt causes formation of kideny stones ?

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