alleryStart learning →Phenolphthalein in a sodium hydroxide solution is:
- colourless
- red
- pink
- yellow
Show answer and solution
Correct answer: C. pink
NaOH is a strong base.
Phenolphthalein is colourless in acid and pink in base — so it turns pink.
Indian Navy 10+2 B.Tech Cadet Acids Bases Salts — practice questions
Explore 5 free Acids Bases Salts questions in Indian Navy 10+2 B.Tech Cadet Chemistry. Open each question or exercise to read its content, reference answers and available explanation.
Practise Acids Bases Salts with Quill →Acids Bases Salts questions and exercises with answers
Showing questions 1–5 of 5.
Phenolphthalein in a sodium hydroxide solution is:Read the answer and worked solution →Hydrochloric acid and acetic acid of the same concentration are compared. Which is the stronger acid?Read the answer and worked solution →The pH of the gastric juices released during digestion isRead the answer and worked solution →Which one of the following can be used as an acid-base indicator by a visually impaired student?Read the answer and worked solution →Which of the following is used for dissolution of gold?Read the answer and worked solution →
Worked practice questions
Hydrochloric acid and acetic acid of the same concentration are compared. Which is the stronger acid?
- stronger HCl
- cannot say
- stronger acetic
- both equal
Show answer and solution
Correct answer: A. stronger HCl
HCl fully dissociates in water; acetic acid only partly.
**So HCl gives more H⁺ per mole and is the stronger acid.**
The pH of the gastric juices released during digestion is
- more than 7
- equal to 7
- less than 7
- equal to 0
Show answer and solution
Correct answer: C. less than 7
This Acids, Bases and Salts item tests a core Chemistry concept.
Correct answer: less than 7.
_Source: syllabus Exemplar Science Class 10_
How to practise
- Choose a Acids Bases Salts question and try to work out your answer.
- Open the question to check the correct answer and read its worked solution.
- Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.