MCQ
Which of the changes is/are exothermi
- AP,Q,S
- ✓R
- CP, S
- DS
| Phase Change Name | Phase | Energy Change | Example |
| Freezing | Liquid to solid | Exothermic | Freezing water |
| Melting (P) | Solid to liquid | Endothermic | Ice melting |
| Condensation (R) | Gas to liquid | Exothermic | Water vapour burns |
| Evaporation (Q) | Liquid to gas | Endothermic | Boiling water |
| Sublimation (S) | Solid to gas | Endothermic | Dry ice |
| Deposition | Gas to solid | Exothermic | Formation of frost |
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S.No
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Column I
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Column II
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$a$
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$9.033 \times 10^{24}$ atoms
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$i$
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$46g$ of He
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$b$
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$2$ moles of Na
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$ii$
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$15$ moles
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$c$
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$11.2 L of O_2$ at $STP$
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$iii$
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$3.011 \times 10^{23}$ molecules
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$d$
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$22g$ of $CO_2$
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$iv$
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$16g$
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S.No.
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Matter
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Classification
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$1.$
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Water
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$2.$
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Mercury
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$3.$
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Air
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$4.$
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Tin
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