Read the given passage and fill in the blanks by choosing an appropriate option. There are some changes in which heat from outside is absorbed leaving the surroundings cooler while in other changes heat is given out making the surroundings warmer. A change in which heat is given out is called a/an _(i)_ change e.g., _(ii)_ , while a change in which heat is taken in is called a/an _(iii)_ change e.g., _(iv)_. There are many changes in which heat is neither
given out nor taken in e.g., _(v)_.
| (i) | (ii) | (iii) | (iv) | (v) | |
|---|---|---|---|---|---|
| A | Exothermic | Burning of paper |
Endothermic | Glowing of an electric lamp |
Mixing salt and water |
| B | Periodic | High and low tides |
Fast | Mixing flour and water |
Dissolving glucose in water |
| C | Exothermic | Slaking of time |
Endothermic | Dissolving glucose in water |
Mixing sand and water |
| D | Endothermic | Setting of cement |
Exothermic | Boiling an egg |
Mixing sand and salt |
Why is A wrong?