Viraf J Dalal Chemistry Class 8 Icse Solutions -

Maya smiled. She wrote confidently: Combination reaction. Iron + Oxygen → Iron(III) oxide. The increase in mass is due to the added oxygen from the air.

Her father, a civil engineer, was busy with site plans. Her mother suggested, “Why not check the solution book?” viraf j dalal chemistry class 8 icse solutions

Suddenly, the concept clicked. She opened the solution book again — not to copy, but to her own answers to 10 practice questions. Each time, the solutions explained the reason , not just the final line. Maya smiled

Maya reluctantly opened to . She found the exact question: “Q. 4(c) – Explain with an example why the mass increases in some chemical changes.” The increase in mass is due to the added oxygen from the air

Here’s a helpful short story that illustrates how a student might use Viraf J. Dalal’s ICSE Chemistry for Class 8 to overcome a common struggle. Maya stared at the periodic table on her wall. It was 10 PM. Her ICSE Class 8 Chemistry exam was in two days, and she had hit a wall.

Instead of just copying the answer, she read the carefully: Solution hint: In rusting, iron (Fe) from the nail combines with oxygen (O₂) from the air and water vapor to form hydrated iron(III) oxide (Fe₂O₃·xH₂O). The rust includes the original iron plus the added oxygen. Therefore, the total mass of the rusted nail is greater than the original nail. Then, Viraf J. Dalal’s book had a "Try This" box: Perform an activity – weigh a clean iron nail, leave it in moist cotton for 3 days, weigh again.