p-Block elementsMediumBloom L3
Question
A gas which exists in three allotropic forms a, b and g is
Options
A.SO2
B.SO3
C.CO2
D.NH3
Solution
Sol. SO3 exists in three allotropic forms.
a) α−SO3: It is chemially active form. It forms long transparent ice like crystals. The melting point of this form is 17oC.
b) β−SO3: It is dimeric (S2O6). It forms needle like silky white crystals. It melts at 32.5oC. Above 50oC, it changes to α-form.
c) It is like β-form and is obtained by completely drying β−SO3. It melts at 62.2oC under 2 atmospheric pressure.
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