All India Engineering / Architecture Entrance Examination (AIEEE)
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AIEEE 2010 Chemistry
Q. 21. The correct sequence which shows decreasing order of the ionic radii of the elements is
So l :
are isolectronic species having 10 electrons each. Cation having positive charge is smallest in size and the anion with high negative charge is largest in size.
Answer: (4)
Q. 22. Percentages of free space in cubic close packed structure and in body centered packed structure are respectively
- 30% and 26%
- 26% and 32%
- 32% and 48%
- 48% and 26%
Sol :
Packing efficiency of CCP and BCC structures are 74% and 68% respectively, so the % of free space in CCP and BCC are 26% and 32% respectively.
Answer: (2)
Q. 23. In aqueous solution the ionization constants for carbonic acid are
Select the correct statement for a saturated 0.034 M solution of the carbonic acid.
- The concentration of
is 0.034 M. - The concentration of
is greater than that of 
- The concentrations of
and 
are approximately equal. - The concentration of
is double that of 
.
Sol :
The 
concentration cannot be 0.034 as H2CO3 and 
are weak acids. 
dissociates very little in second step, such that 
. Concentration of
Answer: (3)
