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Formula of gypsum is CaSO(4).xH(2) and o...

Formula of gypsum is `CaSO_(4).xH_(2)` and of plaster of parts is `(2CaSO_(4)).yH_(2)O`, then (x- y) is equal to

A

0

B

1

C

3

D

`5//2`

Text Solution

Verified by Experts

The correct Answer is:
A
(x - y) = 0 as one `H_(2) O` molecule isassociated in both the cases
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Concrete is produced form a mixture of cement, water and small stones. Small amount of gypsum, CaSO_(4).2H_(2)O is added in coment production to impove the subsequent hardening of concrete. The elevated temperature during the production of cement may lead to the formation of unwanted hemihydrate CaSO_(4)(1)/(2)H_(2)O according to reaction. CaSO_(4)2H_(2)O(s) rarr CaSO_(4)(1)/(2)H_(2)O(s)+(3)/(2)H_(2)O(g) The Delta_(f)H^(Theta) of CaSO_(2).2H_(2)O(s),CaSO_(4)(1)/(2)H_(2)O(s),H_(2)O(g) are -2021.0 kJ mol^(-1), -1575.0 kJ mol^(-1) and -241.8 kJ mol^(-1) , respectively. The respective values of their standard entropies are 194.0, 130.0 and 188.0 J K^(-1)mol^(-1) . The values of R = 8.314JK^(-1)mol^(-1) = 0.0831L bar mol^(-1)K^(-1) . Answer the following questions on the basis of above information. Heat change occuring during conservation of 1kg of CaSO_(4).2H_(2)O(s) (molar mass 172g mol^(-1)) of CaSO_(4)(1)/(2)H_(2)O(s) is equal to

What is the value of x in CaSO_(4).x H_(2)O , gypsum ?

The equilibrium constant for the reaction CaSO_(4).5H_(2)H_(2)O(s)hArr CaSO_(4).3H_(2)O(s)+2H_(2)O(g) is equal to

DINESH PUBLICATION-S-BLOCK ELEMENTS (ALKALI AND ALKALINE EARTH METALS )-JEE MAIN
  1. Which will liberate hydrogen on reacting with hydrochloric acid ?

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  2. A metal X on heating in nitrogen gas gives Y,Y on treatment with H(2)O...

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  3. Formula of gypsum is CaSO(4).xH(2) and of plaster of parts is (2CaSO(4...

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  4. The substance not likely to contain CaCO(3) is:

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  5. The ionic mobility of alkali metal ions in aqueous solution is maximum...

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  6. The charge/size ratio of a cation determines its polarising power. Whi...

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  7. The set representing the correct order of ionic radius is

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  8. Which of the following on thermal decomposition yields a basic as wel ...

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  9. The correct statement for the molecule, CsI(3) is

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  10. A metallic oxide reacts with water to form its hydroxide hydrogen pero...

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  11. Monovalent sodium and postassium ions, bivalent magnesium and calcium ...

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  12. Amongest the following, select the element, with highest ionization en...

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  13. Which one of the following alkaline earth metal sulphates has its hydr...

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  14. The pair of compounds which cannot exist in solution is:

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  15. A solid compound 'X' on heating gives CO(2) gas and a residue. The res...

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  16. In which of the following pairs, each member produces the same gas whe...

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  17. Which one of the following has minimum value of size of cation/anion r...

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  18. Match the elements given in Column I with the colour they impart to th...

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  19. The main oxides formed on combustion of Li,Na and K in excess of air r...

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  20. The low solubility of LiF and that of CsI in water are respectively du...

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