Q.

Incorrect statement about allotropes of sulphur  is

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a

 

Both rhombic and monoclinic sulphur  have S8 rings packed such that both have same crystal structure

b

Specific gravity of rhombic sulphur > Specific gravity of monoclinic sulphur

c

 

Both rhombic and monoclinic sulphur are soluble in carbon disulphide

d

Melting point of β-sulphur > Melting point of α-sulphur

answer is D.

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Detailed Solution

Melting point of β-sulphur(390 K) > Melting point of α-sulphur(385 K) ;

Specific gravity of α-- sulphur(2.06) >Specific gravity of β-  sulphur(1.98) ;

Both α & β forms of sulphur are soluble in carbon disulphide and are insoluble in water ;

Both α and β forms of sulphur have different crystal structures and differ in their packing but have same atomicity ;

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