IMAT Chemical bond questions

Sample questions

1. 1IMAT Doutor

   Water boils at 100 degrees Celsius while hydrogen sulfide, a heavier molecule, boils at about minus 60. The best explanation is that:
   1. AWater molecules are held by covalent bonds to each other, which must be broken for the liquid to boil
   2. BWater has a higher molar mass, so more energy is needed to move its molecules apart into the gas phase
   3. CWater molecules are ionic, so they attract each other much more strongly than those of hydrogen sulfide
   4. DHydrogen sulfide is a solid at room temperature, so its boiling point cannot be compared with that of water
   5. EWater molecules are held together by hydrogen bonds, which sulfur is not electronegative enough to form
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2. 2IMAT 2025 Q36

   What kind of solid is NaCl?
   1. AMolecular
   2. BCovalent network
   3. CIonic
   4. DAmorphous
   5. EMetallic
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