Question

The pH of the salt formed from an acid ‘X’ and a base ‘Y’ is less than 7. Which of the following might be X and Y respectively? ​​

• A. ${\mathrm{HNO}}_3\mathrm{and}{\mathrm{NH}}_4\mathrm{OH}$
• B. ${\mathrm{CH}}_3\mathrm{COOH}\mathrm{and}{\mathrm{NH}}_4\mathrm{OH}$
• C. ${\mathrm{CH}}_3\mathrm{COOH}\mathrm{and}\mathrm{NaOH}$
• D. $HN{O}_{3}andNaOH$

Answer 1

The correct option is A ${\mathrm{HNO}}_3\mathrm{and}{\mathrm{NH}}_4\mathrm{OH}$

If the pH of a salt is less than 7 then it is acidic in nature. We know that acidic salt is formed when strong acid reacts with a weak base. Thus correct answer is the option which contains set of strong acid ${\mathrm{HNO}}_3$and a weak base ${\mathrm{NH}}_4\mathrm{OH}$.