Question

during which of the following changes are new substances formed?
a.melting
b.sublimation
c.dissolution
d.burning

Answer 1

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During which of the following changes are new substances formed?

a.melting

b.sublimation

c.dissolution

d.burning✔✅

During burning changes are new substances formed.

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What is burning?

Burning means flaming or doing combustion a thing.This is chemical change and irreversible change.

Example - Burning a paper,gives ash.We can say this as chemical change.

What is irreversible change ?

Irreversible change means that which a change or difference cannot be reversed forever.

These are also known as chemical changes.

Example -

• Paper when burned becomes ash.
• Milk into curd,Curd cannot become milk.
• Cooked egg can't be a raw egg.
• Cooking a dish can't be reversed.

Answer 2

( d) burning is right