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NEETChemistryp Block Elements (Group 15, 16, 17 & 18)

Match List I with List II regarding the properties of Group 16 hydrides ( H ₂ O , H ₂ S , H ₂ Se , H ₂ Te ). List I (Trend and Cause) List II (Property) (A) Property that increases from H ₂ O to H ₂ Te due to decreasing bond dissociation enthalpy (I) Boiling point (B) Property that decreases from H ₂ O to H ₂ Te due to decreasing bond dissociation enthalpy (II) Bond angle (C) Property that decreases down the group du

Options

  1. A(A)-(IV), (B)-(III), (C)-(I), (D)-(II)
  2. B(A)-(III), (B)-(IV), (C)-(I), (D)-(II)
  3. C(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
  4. D(A)-(IV), (B)-(III), (C)-(II), (D)-(I)

Correct answer

C. (A)-(III), (B)-(IV), (C)-(II), (D)-(I)

Step-by-step solution

Let us analyze each trend for the hydrides of Group 16 ( H ₂ O , H ₂ S , H ₂ Se , H ₂ Te ): (A) Acidic character (III): Increases down the group from H ₂ O to H ₂ Te . As the size of the central atom increases, the E - H bond length increases and bond dissociation enthalpy decreases, making it easier to release an H ^+ ion. (B) Thermal stability (IV): Decreases down the group from H ₂ O to H ₂ Te . This is also due to the decrease in E - H bond dissociation enthalpy as the size of the central atom increases. (C) Bo

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