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Carbon dioxide unusual because it has n...

Carbon dioxide unusual because it has no liquid phase at normal atmospheric pressure. Instead, the solid sublimes directly to the gas phase. To obtain the liquid phase at room temperature, a pressuer of _____`MP` a must be applied.

A

`4.7`

B

`6.7`

C

`5.7`

D

`3.7`

Text Solution

Verified by Experts

The correct Answer is:
B
Phase diagram for `CO_(2)`

According to the phase diagram, `67` times standard atmospheric pressure must be applied.
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Two liquid A and B form an ideal solution at temperature T. When the total vapout pressure above the solution is 400 torr , the mole fraction of A in the vapour phase is 0.40 and in the liquid phase 0.75. What are the vapour pressure of pure A and pure B at temperature T?

When a liquid is completely miscible with another liquid, a homogeneous solution consisting of a single phase is formed. If such a solution is placed in a closed evacuated vessel, the total pressure exerted by the vapour, after the system attained equilibrium will be equal to the sum of partial pressures of the constituents. A solution is said to be ideal if its constituents follow Raoult's law under all conditions of concentrations, i.e., where p_(i) is the partial pressures of the constituent i, whose mole fraction in the solution is x_(i) and p_(i)^(@) is the corresponding vapour pressure of the pure constituent. The change in the thermodynamic functions when an ideal solution is formed by mixing pure components is given by the following expression. Delta_(mix) = G = n_("total") RT sum_(i) x_(i) In x_(i) ...(i) where, n_("total") is the total amount of all the constituents present in the solution. Delta_(mix)F =- n_("total") R sum_(i) x_(i) In x_(i) ......(ii) Delta_(mix)H =- n_("total") RT sum_(i) x_(i) In x_(i) - n_("total") R sum_(i) x_(i) In x_(i) = 0 ........(iii) Delta_(mix) U = 0 .........(iv) Since botli the components of an ideal binary system follow Raoult's law of the entire range of the compositions, the partial pressure exerted by the vapours of these constituents over the solution will be given by p_(A) = x_(A) p_(A)^(@) ..........(v) p_(B) = x_(B) p_(B)^(@) .........(vi) where, x_(A) and x_(B) are the mole fractions of the two constituents in the liquid phase and p_(A)^(@) and p_(B)^(@) are the respective vapour pressure of the pure constituents. The total pressure (p) over the solution will be the sum of the partial pressure. The composition of the vapour phase (y_(A)) can be determined with the help of Dalton's law of partial pressures. Two liquids A and B form an ideal solution at temperature T. when the total vapour pressure above the solution is 600 torr, the mole fraction of A in the vapour phase is 0.35 and in the liquid phase 0.70. The vapour pressure of pure B and A are:

At a particular temperature and atmospheric pressure, the solid and liquid phases of a pure substance can exist i equilibrium. Which of the following term defines this temperature ?

R SHARMA-THE P BLOCK ELEMENTS-follow up test 9
  1. Carbon monoxide can be estimated by reaction with

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  2. Which of the following formula does not represent a metal carbonyl cor...

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  3. Which of the following transition metals is purified by the Mond proce...

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  4. Which of the following reactions is not described correctly?

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  5. Carbon dioxide is prepared by burningin excess of air of oxygen.

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  6. In the laboratory, carbon dioxide is prepared by the action of dilute ...

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  7. Commercially, CO(2) is produced as a byproduct during the manufacture ...

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  8. In CO(2) molecule,

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  9. CO(2) is a linear, monomeric covalent compound. Its real structure is ...

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  10. Which of the following is incorrect regarding carbon dioxide?

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  11. Which of the following metals continue to burn in the atmosphere of CO...

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  12. In aqueous solution, almost all the carbon dioxide is present as

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  13. Which of the following systems helps to maintain the pH of blood?

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  14. Carbon dioxide is a/anoxide.

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  15. Carbon dioxide gas is detected by its action on

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  16. Greenhouse effect is a term used to describe

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  17. Carbon dioxide unusual because it has no liquid phase at normal atmos...

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  18. CO(2) gas can be liquefied under pressure between

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  19. Solid CO(2) is proved as white snow by

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  20. Which of the following is the main uses of CO(2) ?

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