An aqueous solution ‘A’ turns phenolphthalein solution pink. On addition of an aqueous solution ‘B’ to ‘A’, the pink colour disappears. The following statement is true for solution ‘A’ and ‘B’.(a) A is strongly basic and B is a weak base.(b) A is strongly acidic and B is a weak acid.(c) A has pH greater than 7 and B has pH less than 7.(d) A has pH less than 7 and B has pH greater than 7.
Correct Answer: (c) A has pH greater than 7 and B has pH less than 7.
Explanation: Phenolphthalein solution turns pink in basic solutions. Hence, solution A lies in the pH range of above 7. On adding solution B the pink colour disappears hence it has a pH less than 7, then the pH of the final solution will decrease. Hence option (c) is correct. 
Related Articles
- Give one example each of a salt which gives an aqueous solution having :(a) pH less than 7 (b) pH equal to 7 (c) pH more than 7
- The colour of methyl orange indicator in a solution is yellow. The pH of the solution is likely to be:(a) 7 (b) Less than 7 (c) 0 (d) More than 7
- A solution turns phenolphthalein indicator pink. The most likely pH of the solution will be:(a) 6 (b) 4 (c) 9 (d) 7
- Fill in the following blanks with suitable words:(a) Acids have a pH ______ than 7.(b) Alkalis have a pH _____ than 7.(c) Neutral substances have a pH of _____.(d) The more acidic a solution, the _____ the pH.(e) The more alkaline a solution, the ______ the pH.
- pH of basic solution is always __________ than 7.
- You have two solutions A and B. The pH of solution A is 6 and pH of solution B is 8.i. Which solution has more hydrogen ion concentration?ii. Which of this is acidic and which one is basic?
- Fresh milk has a pH of 6. When milk changes into curd, the pH value will:(a) Become 7 (b) Become less than 6 (c) Become more than 7 (d) Remain unchanged
- A solution has pH value of 5. On adding 10 mL of NaCl to it, what will be the pH of the new solution?(a) More than 5(b) Less than 5(c) Only seven(d) No change in pH
- The salts of a strong acid and weak base are ________ with pH value __________ than 7.
- A solution turns blue litmus red. Its pH is likely to be:(a) 7 (b) 5 (c) 8 (d) 14
- table style=width:80%">A salt is dissolved in water and the pH of this salt solution is measured with a universal indicator paper. If the pH of the solution is less than 7
- (a) What do you think will be the pH in the stomach of a person suffering from indigestion: less than 7 or more than 7?(b) What do you think will be the pH of an antacid solution: less than 7 or more than 7?(c) How does an antacid work?(d) Name two common antacids.
- A student measured the pH values of four solutions A, B, C and D which were found to be 4, 1, 13 and 11 respectively. Which of the following statements are correct about these solutions?(a) A is strong acid and B is weak acid (b) B is strong acid and D is weak base (c) D is strong base and C is weak base (d) C is strong base and A is weak acid (1) (a) and (b) (2) (b) and (c) (3) (c) and (d) (4) (b) and (d)
- Which is more acidic: a solution of pH = 2 or a solution of pH = 6?
- Which of the following statements is correct about an aqueous solution of an acid and of a base?Higher the pH, stronger the acidHigher the pH, weaker the acidLower the pH, stronger the baseLower the pH, weaker the base(a) (i) and (iii)(b) (ii) and (iii)(c) (i) and (iv)(d) (ii) and (iv)
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies