Q.

Given below are two statements : 
Statement (I) : The first ionization energy of Pb is greater than that of Sn 
Statement(II) : The first ionization energy of Ge is greater than that of Si. 
In the light of the above statements, choose the correct answer from the options given below : 

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a

Statement I is false but Statement II is true

b

 Statement I is true but Statement II is false

c

Both Statement I and Statement II are false

d

Both Statement I and Statement II are true

answer is A.

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Detailed Solution

Order of I.E. (in KJ/mol) : 
  C   >  Si  > Ge > Sn  < Pb 
 1086   786   761   708   715

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Given below are two statements : Statement (I) : The first ionization energy of Pb is greater than that of Sn Statement(II) : The first ionization energy of Ge is greater than that of Si. In the light of the above statements, choose the correct answer from the options given below :