MCQ
Which of the following statements are correct?
- AAcid turns blue litmus red.
- BBase turns red litmus blue.
- ✓Both $A$ and $B$ correct
- DWater changes the colour of red litmus.
An acidic solution turns blue litmus red. On the $pH$ scale, acids have values less than $7.$
A basic solution turns red litmus blue. On the $pH$ scale, bases have values more than $7.$
Water is neither acidic nor basic, which means it is neutral. So, it can not change the color of litmus paper. The $pH$ value for water is equal to $7.$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
| Column I | Column II |
| 1. Oxygen | (A) Releases energy from food |
| 2. Glucose | (B) By-product of photosynthesis |
| 3. Sunlight | (C) Taken in during photosynthesis |
| 4. Carbon dioxide | (D) Stored as starch in plants |
| 5. Respiration | (E) Source of energy for photosynthesis |