Discussion
A sample of soil mixed with water turns the pH paper yellowish orange. Which of the following would now change the colour of the pH paper to bluish?
Answer: A
The pH paper would turn bluish with Milk of magnesia.
Universal indicator turning yellowish orange shows a slightly acidic soil sample. To make it turn blue, the mixture must become basic. Milk of magnesia is a suspension of magnesium hydroxide, a base, which neutralises the acid and raises the pH.
Lemon juice and vinegar are acids and would make the paper turn more red. Common salt is a neutral salt and would not change the colour towards blue.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development