Which of the following substances undergo chemical changes on heating?

NDA / Chemistry 🧪 Lesson 01 PHYSICAL AND CHEMICAL CHANGES. practice exercise

1. Which of the following is a chemical

change?

(a, Evaporation

(c) Sublimation

(b) Dissolution

(d) Precipitation

2. Which of the following is always accompanied duringa chemical change?

(a) Evolution of light

(b) Evolution or absorption of heat

(c) Evolution of heat onlyy

(d) Absorption of heat only

3. Which of the following substances undergo chemical changes on heating?

(a) Sodium chloride

(b) Silica

(c) Lead nitrate

(d) Platinum wire

4. Which one among the following is a chemical process?

(a) Distillation of sea (salty) water

(b) Crystallisation of impure salt (NaCl)

(c) Production of iodine (I2) from seaweeds

(d) Sublimation of iodine (I2)

5. Which among the following is a

chemical change?

(a) A wet towel dries in the sun

(b) Lemon juice added to tea causing its colour to change

(c) Hot air rises over a radiator

(d) Coffee is brewed by passing steam through ground coffee

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