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The name of CaSO4.1/2H2O is...

The name of `CaSO_4.1/2H_2O` is

A

Gypsum

B

Epsom salt

C

Plaster of Paris

D

Dolomite

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The correct Answer is:
C
`CaSO_4.1//2H_2O` is Plaster of Paris.
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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. The formation of CaSO_(4)(1)/(2)H_(2)O at 298K is

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. The equilibrium pressure of water vapour in closed vessel containing CaSO_(4)2H_(2)O(s),CaSO_(4)(1)/(2)H_(2)O(s) and H_(2)O(g) at 298K (Antilog -3.14 = 7.24 xx 10^(-4)) is

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

Answer the following : (a) Why is Plaster of Paris written as CaSO_(4)1//2H_(2)O How is it possible to have half a water molecule attached to CaSO_(4) ? (b) Why is sodium hydrogen carbonate an essential ingredient in antacids ?

Why is the formula of plaster of paris written as CaSO_(4) .1/2 H_(2)O ?

Concerete is produced from a mixture of cement , water, sand and small stones. It consists primarily of calcium silicates and calcium aluminates formed by heating and grinding of clay and limestone. In later steps of cement production a small amount of gypsym , CaSO_(4).2H_(2)O is added to improve subsequent hardening of concrete . The use of elevated temperature during the final production may lead to formation of unwanted hemihydrate, CaSO_(4).1//2H_(2)O. Consider the following reaction: CaSO_(4).2H_(2)O(s) rarr CaSO_(4).(1)/(2) H_(2)O(s)+(3)/(2)H_(2)O(g) The following themodynamic data apply at 25^(@)C standard pressure : 1 bar {:("Compound","DeltaH_(f(KJ//mol))^(@),S^(@)(JK^(-1)mol^(-1))),(CaSO_(4).2H_(2)O(s),-2021.0,194.0),(CaSO_(4).(1)/(2)H_(2)O(s),-1575.0,130.5),(H_(2)O(g),-242.8,188.6):} R=8.314 JK^(-1)mol^(-1) DeltaH^(@) for the formation of 1.00 kg of CaSO_(4).(1)/(2) H_(2)O(s) from CaSO_(4).2H_(2)O(s) is

Concerete is produced from a mixture of cement , water, sand and small stones. It consists primarily of calcium silicates and calcium aluminates formed by heating and grinding of clay and limestone. In later steps of cement production a small amount of gypsym , CaSO_(4).2H_(2)O is added to improve subsequent hardening of concrete . The use of elevated temperature during the final production may lead to formation of unwanted hemihydrate, CaSO_(4).1//2H_(2)O. Consider the following reaction: CaSO_(4).2H_(2)O(s) rarr CaSO_(4).(1)/(2) H_(2)O(s)+(3)/(2)H_(2)O(g) The following themodynamic data apply at 25^(@)C standard pressure : 1 bar {:("Compound","DeltaH_(f(KJ//mol))^(@),S^(@)(JK^(-1)mol^(-1))),(CaSO_(4).2H_(2)O(s),-2021.0,194.0),(CaSO_(4).(1)/(2)H_(2)O(s),-1575.0,130.5),(H_(2)O(g),-242.8,188.6):} R=8.314 JK^(-1)mol^(-1) Temperature at which the equillibrium water vapour pressure is 1.00 bar

DINESH PUBLICATION-ALKALI EARTH METALS-Revision Questions From Competitive Exams.
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  11. Bleaching action of Bleaching powder is due to the liberation of

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  12. 30g Mg and 30g O(2) are reacted and the residual mixture contains:

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

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  18. Serveral blocks of magnesium are fixed to the bottom of a ship to

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