Chemistry-
General
Easy
Question
The order of the magnitude of ionic radii of ions 
and 
is
- (a)
- (c)
The correct answer is: (a)
. All are isoelectronic but nuclear charge per electron is highest for , so it has smallest size.
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The order of magnitude of ionic radii of ions 
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The 120 permutations of MAHES are arranged in dictionary order, as if each were an ordinary five-letter word. The last letter of the 86th word in the list is
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If the letters of the word ‘‘VARUN’’ are written in all possible ways and then are arranged as in a dictionary, then the rank of the word VARUN is :
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Let y be an element of the set A = {1, 2, 3, 5, 6, 10, 15, 30} and x1, x2, x3 be integers such that x1 x2 x3 = y, then the number of positive integral solutions of x1 x2 x3 = y is
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