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If the number of molecules of SO2 (molecular weight = 64) effusing through an orifice of unit area of cross-section in unit time at 0°C and 1 atm pressure is n. The number of He molecules (atomic weight = 4) effusing under similar conditions at 273°C and 0.25 atm is           
  • a)
  • b)
         
  • c)
    2n                     
  • d)
    n/2
Correct answer is option 'A'. Can you explain this answer?
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If the number of molecules of SO2 (molecular weight = 64) effusing thr...
The number of molecules of SO2 (molecular weight =64) effusing through an orifice of unit area of the cross-section in unit time at 0°C and 1 atm pressure is n. This represents the rate of effusion of SO2.
Let x be the rate of effusion of He.
The expression for the relative rates of effusion of two gases is  
r1/r2 = p1/p2√(T2M2/T1M1)
​Here, 1 represents SO 2 and 2 represents He.
Substitute values in the above expression.
n/x=1/0.25 √[(273×64)/(2×273×4)]
​Hence,  x= n/√2
​So, the correct option is A
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If the number of molecules of SO2 (molecular weight = 64) effusing thr...
The number of molecules of SO2 (molecular weight =64) effusing through an orifice of unit area of the cross-section in unit time at 0°C and 1 atm pressure is n. This represents the rate of effusion of SO2.
Let x be the rate of effusion of He.
The expression for the relative rates of effusion of two gases is  
r1/r2 = p1/p2√(T2M2/T1M1)
​Here, 1 represents SO 2 and 2 represents He.
Substitute values in the above expression.
n/x=1/0.25 √[(273×64)/(2×273×4)]
​Hence,  x= n/√2
​So, the correct option is A
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Attempt All sub parts from each question.Molecular Perspective In water, there are two types of molecules. Some molecules are at the surface, called exterior molecules, and some molecules are inside, called interior molecules. The interior molecules are attracted to all the molecules around them. The exterior molecules are attracted to only the other surface molecules and to those below the surface. So that the energy state of the molecules on the interior is much lower than that of the molecules on the exterior. The molecules always try to maintain a lower energy state and hence the exterior molecules experience a downward force. This force is known as cohesive force. As a result they try to maintain a minimum surface area, thus allowing more molecules to have a lower energy state. Thus surface tension is created. The water molecules attract one another due to the water molecule’s polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen, cause water to "stick " together. This is why there is surface tension. Water has very high surface tension. It is 72.8 milli newton per meter at 20°C.Q. Which one of the following is the correct molecular structure of water molecule?

Attempt All sub parts from each question.Molecular Perspective In water, there are two types of molecules. Some molecules are at the surface, called exterior molecules, and some molecules are inside, called interior molecules. The interior molecules are attracted to all the molecules around them. The exterior molecules are attracted to only the other surface molecules and to those below the surface. So that the energy state of the molecules on the interior is much lower than that of the molecules on the exterior. The molecules always try to maintain a lower energy state and hence the exterior molecules experience a downward force. This force is known as cohesive force. As a result they try to maintain a minimum surface area, thus allowing more molecules to have a lower energy state. Thus surface tension is created. The water molecules attract one another due to the water molecule’s polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen, cause water to "stick " together. This is why there is surface tension. Water has very high surface tension. It is 72.8 milli newton per meter at 20°C.Q. The water molecules attract one another due to the water molecule’s

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If the number of molecules of SO2 (molecular weight = 64) effusing through an orifice of unit area of cross-section in unit time at 0°C and 1 atm pressure is n. The number of He molecules (atomic weight = 4) effusing under similar conditions at 273°C and 0.25 atm isa)b) c)2nd)n/2Correct answer is option 'A'. Can you explain this answer?
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