p-Block elementsMedium

Question

Which of the following group contains solid compounds at 10°C?

Options

A.$H_{2}O,{NH}_{3}{CH}_{4}$
B.$F_{2},{Cl}_{2},{Br}_{2}$
C.${SO}_{3},I_{2},NaCl$
D.$Si,S_{8},{CH}_{3}{COCH}_{3}$

Solution

Sol. Key concept: Physical state depends on melting point at the stated temperature.

At ordinary pressure, SO₃ has a melting point of about 16.8°C for its common molecular form, iodine melts at about 113.7°C, and NaCl at about 801°C. At 10°C, all three are solids, so (c) is correct.

Option (a) includes liquid water and gaseous ammonia/methane. Option (b) includes gaseous fluorine and chlorine and liquid bromine. Option (d) includes acetone, which is liquid at 10°C. Hence none of these other sets contains only solids.

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