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Correct order of Acidic strength is?
By BYJU'S Exam Prep
Updated on: September 25th, 2023
(A) CH4 > NH3 > H2O > HF
(B) HF > H2O > CH4 > NH3
(C) CH4 < NH3 < H2O < HF
(D) HF > CH4 > H2O > NH3
Correct order of Acidic strength is CH4 < NH3 < H2O < HF. Consider the given compounds CH4, NH3, H2O and HF. These are all hydrides of elements in the periodic table’s first row. The dominating factor when comparing compounds that are located in the same horizontal row of the periodic table is the electronegativity of the atom binding to the hydrogen.
Table of content
The H+ ion is more easily released because the electron density is pushed towards the highly electronegative element. We have added a few more points about electronegativity that you should go through.
- We are aware that in the periodic table, the electronegativity rises throughout a row from left to right.
- The order of the relative electronegativities, in this case, is C, N, O, and F.
- The bond H-F is more polarised, and the proton in HF is more positive since fluorine is the most electronegative element. H-F is thus the most acidic.
The increasing order of acidic strength of the given hydrides is given by CH4 < NH3 < H2O < HF
Summary:
The correct order of Acidic strength is? (A) CH4 > NH3 > H2O > HF (B) HF > H2O > CH4 > NH3 (C) CH4 < NH3 < H2O < HF (D) HF > CH4 > H2O > NH3
Acidic strength in correct order is CH4 < NH3 < H2O < HF. These are all hydrides of elements that are in the first row of the periodic table. The electronegativity of the atom bonding to the hydrogen is the determining factor when comparing compounds that are found in the same horizontal row of the periodic table.
