Question

pH of a compound A is indicated on a pH scale which statement is not true about this compound.
A. it has more H+ (aq) than OH- (aq)
B. it is sour in taste
C. it is basic in nature
D. it has more H-(aq) than OH+ (aq) ​

Answer 1

Answer:

The correct option is D) it has more or maximum H-(aq) than OH+ (aq) ​

Explanation:

Whenever we observe any compound pH it measures or calculates the concentration of the protons that is the $H^{+}$ ions concentration. If it is very high then the scale gives or shows a value of less than 7, it shows 7 when the neutral compound is tested, and then more than 7 up to the value of 14 if it has a very less proton concentration that is it has a greater $OH^{-}$ ion concentration. Since in the last option it is given $H^{-}$ (aq) than $OH^{+}$(aq), the signs are wrong here for the ions and hence this option is incorrect.

Answer 2

The statement which is not true about compound A is that it is basic in nature.

• the pH of a compound that lies between 1 to 6 is acidic, pH equals to 7 is considered neutral whereas the pH of the compound that lies between 8 to 15 are basic.
• Acidic compounds have a higher concentration of hydrogen or chromium ions as compared to hydroxide ions and it is vice-versa for basic compounds.
• Acidic compounds are even sour when tasted.
• As the pH of compound A is 5 then it is evident that the compound is acidic and not basic.

Hence, the correct option is c.