What happens when aqueous solution of sulphuric acid comes in contact with blue litmus paper?
Answer & explanation
Correct answer: option 1
The correct answer is option 1. Red.
When an aqueous solution of sulfuric acid comes in contact with blue litmus paper, the litmus paper turns red. Sulfuric acid is a strong acid and it reacts with the blue litmus paper, causing it to change color to red. This is because the acid donates protons (H⁺ ions) to the litmus paper, making it acidic and causing the color change.