MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
Which in the stimulus has high melting and boiling points?
Think it through first, then pick an option.
- a H₂O
- b KX
- c C₂H₅−X
- d A
Answer and explanation
Correct answer: b KX
K is a metal and X a halogen: KX is ionic, so its melting and boiling points are high.
Why the other options are wrong
- a H₂O: Water is covalent; its melting and boiling points are lower than those of ionic KX.
- c C₂H₅−X: This is a covalent (organic) compound with a low melting point.
- d A: A is a covalent (organic) compound with a low melting point.
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