Which of the following is a physical change?
2022
Which of the following is a physical change?
- A.
Burning of a Mg wire in air
- B.
Glowing of a Pt wire when heated
- C.
Electrolysis of acidulated water
- D.
Passing carbon dioxide through lime water
Attempted by 78 students.
Show answer & explanation
Correct answer: B
A physical change is a change in which no new substance is formed and only physical properties such as state, shape, size, or appearance change.
When a platinum (Pt) wire is heated, it glows due to becoming hot. On cooling, it returns to its original state. No new substance is formed, so this is a physical change.