1.

Under which different types can be following changes be classified:i. Formation of curd from milk.ii. Burning of wood or paper.iii. Glowing of bulb.iv. Rusting of iron.v. Burning of Camphor.vi. Souring of milk.vii. Digestion of food.viii. Change of season.ix. Day and night formation.

Answer»

i. Manmade change (useful), chemical

ii. Manmade, chemical change.

iii. Manmade (fast).

iv. Chemical change (harmful)

v. Chemical change

vi. chemical change (harmful)

vii. Chemical change (useful), irreversible

viii. Periodic change, natural change

ix. Periodic change



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