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Solubility of a substance which dissolve...

Solubility of a substance which dissolves with a decrease in volume and absorption of heat will be favoured by

A

High P and high T

B

Low P and low T

C

High P and low T

D

Low P and high T

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The correct Answer is:
A
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Solubility of gases in liquids __________ with decrease in temperature.

Le Chatelier's Principle If a system at equilibrium is subjected to a change of any one of the factors such as concentration, pressure or temperature, the system adjusts itself in such a way as to nullify the effect of that change. Change of pressure : If a system consists of gases, then the concentration of all the components can be alterd by changing the pressure. To increase the pressure on the system,the volume has to be decreased proportionally. The total number of mols per unit volume will now be more and the equilibrium will shift in the direction in which there is a decrease in number of moles i,e. towards the direction in which there can be decrease in pressure. Effect of pressure on melting point : There are two types of solids: (a) Solids whose volume decreases on melting e.g., ice,diamond carborundum magnesium nitride and quratz. Solids (higher volume) hArr Liquid (lower volume) The process of melting is facilitated at high pressure, thus, melting point is lowerd. (b) Solids whose volume increase on melting e.g.,Fe,Cu,Ag,Au,etc. Solid (lower volume) hArr Liquid (higher volume) In this case the process of melting become difficult at high pressure, thus melting point becomes high. (c) Solubility of substances : When solid substances are dissolved in water, either heat is evolved (exothermic) or heat is absorbed (endothermic). KCI+aqhArrKCI(aq)-heat In such cases, solubility increase with increase in temperature. Consider the case of KOH, when this is dissolved,heat is evolved. KOH+aqhArrKOH(aq)+heat In such cases, solubility decrease with increase in temperature. (d) Solubility of gases in liquids : When a gas dissolves in liquid,there is decrease in volume. Thus increase of pressure will favour the dissolution of gas in liquid. A gas 'X' when dissolved in water,heat is evolved. Then solubility of 'X' will increase:

Le Chatelier's Principle If a system at equilibrium is subjected to a change of any one of the factors such as concentration, pressure or temperature, the system adjusts itself in such a way as to nullify the effect of that change. Change of pressure : If a system consists of gases, then the concentration of all the components can be alterd by changing the pressure. To increase the pressure on the system,the volume has to be decreased proportionally. The total number of mols per unit volume will now be more and the equilibrium will shift in the direction in which there is a decrease in number of moles i,e. towards the direction in which there can be decrease in pressure. Effect of pressure on melting point : There are two types of solids: (a) Solids whose volume decreases on melting e.g., ice,diamond carborundum magnesium nitride and quratz. Solids (higher volume) hArr Liquid (lower volume) The process of melting is facilitated at high pressure, thus, melting point is lowerd. (b) Solids whose volume increase on melting e.g.,Fe,Cu,Ag,Au,etc. Solid (lower volume) hArr Liquid (higher volume) In this case the process of melting become difficult at high pressure, thus melting point becomes high. (c) Solubility of substances : When solid substances are dissolved in water, either heat is evolved (exothermic) or heat is absorbed (endothermic). KCI+aqhArrKCI(aq)-heat In such cases, solubility increase with increase in temperature. Consider the case of KOH, when this is dissolved,heat is evolved. KOH+aqhArrKOH(aq)+heat In such cases, solubility decrease with increase in temperature. (d) Solubility of gases in liquids : When a gas dissolves in liquid,there is decrease in volume. Thus increase of pressure will favour the dissolution of gas in liquid. For the reaction (1)/(2)N_(2)(g)+(1)/(2)O_(2)(g)hArrNO(g) If pressure is increased by reducing the volume of the container then:

If a system at equilibrium is subjected to a change of any one of the factors such as concentration , pressure or temperature, the system adjusts itself in such a way so as to minimise the effect of that change. Effect of change in concentration on equilibrium: As we add or remove reactant (or product) the ratio of equilibrium concentratio become 'Q' (reaction quotient) and depending upon. QltK : equilibrium will shift ihn forward direction QgtK equilibrium will shift in backward direction Effect of change in pressure : If a system in equilibrium consists of gases, then the concentrations of all the components can be altered by changing the pressure. When the pressure on the system is increased, then equilibrium will shift in the direction in which there is decrease in number of moles i.e., towards the direction in which there is decrease in volume. Effect of change in pressure on melting point : There are two rypes of solids : Solids whose volume decreases on melting, e.g., ice, diamond, carborundum, magnesium nitride and quartz. Solid (higher volume) hArr Liquid (higher volume) The process of melting is facillitated at high pressure, thus melting point is lowered. Solid whose volume increase on melting, e.g., Fe, Cu, Ag, Au, etc. Solid (lower volume) hArr Liquid (higher volume) In this case the process of melring becomes difficult at high pressure, thuse melting point becomes high. Solubility of substances : When solid substance are dissolved in water, either heat is evolved. for endothermic solubility process solubility increase with increase in temperature. For exothemic solubility decrease with increase in temperature. Solubility of gases in liquids : when a gas dissolves in liquid, there is decreases in voolume. Thus increase of pressure will faavour the dissolution of gas in liquid. Effect of temperature : For endotherimic reacrtion as temperature increases reaction shift in backward direction A'X'(g) solute when dissolved in water heat is evolved. Then solubility of' X' will increase :

Specifc Heat Capacity And Absorption Of Heat

NARAYNA-CHEMICAL EQUILIBRIUM-Exercise -II (C.W.)
  1. The equilibrium constants for the following reactions N(2) (g) + 3H(...

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  2. For the equilibrium, PCl(5) Leftrightarrow PCl(3)+Cl(2), K(c)=alpha^(2...

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  3. Solubility of a substance which dissolves with a decrease in volume an...

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  4. The equilibrium constant for the reaction NH(4)HS(s) Leftrightarrow NH...

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  5. The decomposition of N(2)O(4) to NO(2) is carried out at 280^(@)C in c...

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  6. For the reaction C(s)+CO(2)(g) hArr 2CO(g), the partial pressure of CO...

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  7. In which of the following reactions, the concentration of product is h...

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  8. Equilibrium constant for an equilibrium reaction is 100. Its forward r...

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  9. In the reaction PCl(5)(g) hArr PCl(3)(g)+Cl(2)(g), the equilibrium c...

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  10. For the reaction, A(g)+2B(g)hArr2C(g) one mole of A and 1.5 mol of B a...

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  11. Which of the following is not the characteristic of chemical equilibri...

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  12. Equilibrium constant for the reaction H(2)O((g))+CO((g)) Leftrightarro...

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  13. PCl(3), PCl(3) and Cl(2) are at eqilibrium at 500 K and above have con...

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  14. A+B rarr C+D Initially moles of A and B are equal. At equilibrium, mol...

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  15. The Kc for the reaction A+B Leftrightarrow C is 4 and K. for 2A+D Left...

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  16. 1.50 moles each of hydrogen and iodine is p[laced in a sealed 10 litre...

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  17. At a given temperature the equilibrium constant for the reaction PCl(5...

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  18. In alkaline solution, the following equilibria exist a. S^(2-)+S rar...

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  19. The equilibrium constant (K(p)) for the reaction, PCl(5(g))hArrPCl(3(g...

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  20. The rate constant of the reaction A rarr 2B is 1.0 xx 10^(-3) mol "lit...

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