S Block Elements Question 301
Question: What is the correct relationship between the pHs of isomolar solutions of sodium oxide $ (pH_1), $ sodium sulphide $ (pH_2), $ sodium selenide $ (pH_3) $ and sodium telluride $ (pH_4) $
[CBSE PMT 2005]
Options:
A) $ pH_1>pH_2=pH_3>pH_4 $
B) $ pH_1<pH_2<pH_3<pH_4 $
C) $ pH_1<pH_2<pH_3=pH_4 $
D) $ pH_1>pH_2>pH_3>pH_4 $
Show Answer
Answer:
Correct Answer: D
Solution:
Order of acidic strength is $ H_2Te>H_2Se>H_2S>H_2O $
$ Na_2O $ is a salt of $ NaOH+H_2O $ and $ H_2O $ is least acidic among given acids hence pH in this case will be maximum.
BETA
