JEE Main & Advanced Sample Paper JEE Main - Mock Test - 44

  • question_answer
    Which of the following statements is/are CORRECT about allotropic forms of sulphur?
    (I) Both \[\alpha \]-sulphur (yellow rhombic) and \[\beta \]-sulphur (monoclinic) consist of Sg puckered ring having crown shapes.
    (II) Below 369 K, monoclinic sulphur is more stable.
    (III) \[\varepsilon \]-sulphur or EngeFs sulphur consists of \[({{S}_{6}})\]6-membered puckered rings with chair form.
    (IV) In vapour state sulphur partly exists a \[{{S}_{2}}\]molecule and exhibits diamagnetism.

    A) II, III            

    B)        I, III           

    C)   I, II, III                 

    D)        II, III, IV

    Correct Answer: B

    Solution :

      [b] Statements (I) and (III) are CORRECT. CORRECT statement (II): Below \[369\text{ }K,\]rhombic sulphur is more stable. CORRECT statement (IV): \[{{S}_{2}}\] exhibits paramagnetism, due to 2 unpaired \[\bar{e}'s\] in the antibonding \[\pi *\] orbitals.      


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