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Q.

In a period, acid - strength increases with the decrease in size of the atom and increase of electronegativity. which of the following is correct order for acidic strength?

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a

CH4 < NH3 < H2O < HF

b

NH3 < H2O < HF < CH4

c

H2O < CH4 < NH3 < HF

d

H2O <  HF <CH4 < NH3 

answer is A.

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Detailed Solution

CH4 2.5< NH33.0 < H23.5O<HF4.0

           (Electronegativities are mentioned with the atoms)

Size of atoms decreases as C > N > O > F

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