86 Modern Refrigerai 4 Critical pressure is the totance is copable A. maximum of

Question

86 Modern Refrigerai 4 Critical pressure is the totance is copable A. maximum of achieving n pressure at which a gas at its critical temperature can condense C mini mum pressure at which a substance at its cri applied to a solid that causes it to change to a liquid 5. The the pressure on a substarnioe temperature needed to bring about achange of physical state. A. higher, higher B higher, lower C. lower, higher D. None of the above. 6 law states that if volume is held constant, temperature varies directly with Boyle's Charles C. Dalton's D. Gay-Lussac's 7law states that in a confined mixture of gases, the pressure of each gas must be added to calculate the total pressure Boyle's Charles Dalton's 8. According to the combined gas law, if the pressure of a gas is held constant as its temperature is increased, then the volume of the gas- A. decreases B. increases remains constant None of the above. 9, A saturated vapor will condense if the A. temperature of the vapor is increased B. pressure of the vapor is decreased C. pressure of the vapor is decreased and the temperature is increased D pressure of the vapor is increased and the temperature is decreased 10. A cooling effect can be generated through A. air exchange B. pressure change state change All of the above. Copyright G

Explanation / Answer

Solving only parts 4-7 as per chegg policy

(4) The critical pressure of a substance is the pressure required to liquefy a gas at its critical temperature. Thus C is correct option.

(5) If pressure on a substance is higher, higher temperature is needed to change its state. Lets take the example of boiling of water. If we boiled the water and then applied pressure to compress it, the vapors will condense back into liquid state due to higher temperature and more heat will be required to rise the temperature further for boiling.Thus option A is correct.

(6) This is Gay-Lussac's law. Thus option D is correct.

(7)This is dalton's law of partial pressures. Thus option C is correct.

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