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Plaster of Paris should be stored in a m...

Plaster of Paris should be stored in a moisture-proof container. Explain why?

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Plaster of Paris should be stored in a moisture - proof container because the presence of moisture (or water) can cause its slow setting by bringing about its hydration. This will make the plaster of Paris useless after some time.
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Plaster of Paris is

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(a) What are the common names of . (a) CaOCl_(2) , and (b) Na_(2)CO_(3)10H_(2)O ? (b) Why should plaster of Paris be stored in a moisture-proof container? (c) Explain why, while diluting a concentrated acid, acid should be added to water and not water to the acid.

(a). What is plaster of paris? Write the chemical formula of plaster of paris. (b) How is plaster of paris prepared? Write chemical equation of the reaction involved. (c) Explain why plaster of paris should be stored in a moisture-proof container. (d) State two important uses of plaster of paris.

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LAKHMIR SINGH & MANJIT KAUR-ACID, BASES AND SALTS-Exercise
  1. What is the common name of the compound CaOCl(2)?

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  2. Name the substance which on treatment with chlorine yields bleaching p...

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  3. Name the sodium compound which is used for softening hard water.

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  4. What will happen if a solution of sodium hydrocarbonate is heated? Giv...

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  5. Write an equation to show the reaction between Plaster of Paris and wa...

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  6. A solution turns blue litmus red. Its pH is likely to be:

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  7. A solution reacts with crushed egg-shells to give a gas that turns lim...

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  8. 10 mL of a solution of NaOH is found to be completely neutralised by 8...

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  9. Which one of the following types of medicines is used for treating ind...

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  10. Write word equations and then balanced equations for the reaction taki...

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  11. Compounds such as alcohols and glucose also contain hydrogen but are n...

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  12. Why does distilled water not conduct electricity, whereas rain water d...

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  13. Why do acids not show acidic behaviour in the absence of water?

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  14. Five solutions A,B,C,D and E when tested with universal indicator show...

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  15. Equal lengths of magnesium ribbons are taken in test tubes A and B. Hy...

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  16. Fresh milk has a pH of 6. How do you think the pH will change as it tu...

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  17. A milkman adds a very small amount of baking soda to fresh milk. (a)...

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  18. Plaster of Paris should be stored in a moisture-proof container. Expla...

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  19. What is a neutralisation reaction? Give two examples.

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  20. Give two important uses of washing soda and baking soda.

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