alleryStart learning →Which pair correctly matches the change with its type?
ACooking an egg: physical
BBoiling water: chemical
CBurning magnesium: chemical
DCrushing chalk: chemical
Answer & Solution
Correct answer: C. Burning magnesium: chemical
Burning magnesium forms magnesium oxide, a new substance, while boiling water and crushing chalk change only state or size.
Keep practising Physical and chemical changes
Browse all Physical and chemical changes questions for Olympiad (Class 7), or explore more Science topics.
Related questions
A change in colour during a process most reliably suggestsCopper turns green after long exposure to damp air. This shows copper hasBaking soda is added to vinegar and bubbles of gas appear. This showsWhich of these is a physical change?A chemical reaction changes the atoms of a substance byRusting is specifically the corrosion of which metal?Stainless steel resists rusting because it forms a thin layer ofA thin layer of grease on iron tools stored for long keeps them from rusting by