NCERT Exemplar Solutions
Class 10 - Science - CHAPTER 2: Acids, Bases and Salts - Multiple Choice QuestionsQuestion 7
Class 10 - Science - CHAPTER 2: Acids, Bases and Salts - Multiple Choice Questions
Question. 7
A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?
(a)
Lemon juice
(b)
Vinegar
(c)
Common salt
(d)
An antacid
Detailed Answer with Explanation:
Steps: Yellowish-orange indicates acidic to neutral pH. An antacid is basic and will raise pH to alkaline (greenish-blue). Lemon juice and vinegar are acidic; common salt is neutral.