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NEET2006Chemistryp Block Elements (Group 13 & 14)Actual

The incorrect statement among the following is

Options

  1. AC ₆₀ is an allotropic form of carbon
  2. BO ₃ is an allotropic form of oxygen
  3. CS ₈ is only allotropic form of sulphur
  4. Dred phosphorus is more stable in air than white phosphorus.

Correct answer

C. S ₈ is only allotropic form of sulphur

Step-by-step solution

The different allotropic forms of sulphur arises partly from the extent to which S has polymerised and partly from the crystal structures adopted. The two common crystalline forms are or rhombic sulphur and or monoclinic sulphur. A third modification is -monoclinic sulphur. All three forms contain puckered S₈ rings with a crown conformation. Engel's sulphur ( -sulphur) contains S₆ rings. S ₇, ~S ₉, ~S ₁₀, ~S ₁₁, ~S ₁₂, ~S ₁₈ and S ₂₀ rings have been made by Schmidt and his group. Plastic or -sulphur contains spiral

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