which of the following order is wrong
1.NH3 < PH3 < AsH3- acidic nature
2.Li+ < Na + K+ < Cs+ - ionic radius
3.Al2O3 < MgO < Na2O < K2O - basic
4.Li < Be < B < C - 1stionisation potential

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Answer is 'd' but how?
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Answer b is correct
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Option 4 is the ans
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ionization energy increases across the group so answer is d
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Please find the attachment for the answer

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