NEETChemistryp Block Elements (Group 15, 16, 17 & 18)
Observe the following statements : a. The thermal stability of hydrides of group 16 elements follow the order : H ₂ O > H ₂ ~S > H ₂ Se > H ₂ Te b. Acidic nature of hydrides of group 16 elements follow the order : H ₂ O > H ₂ ~S > H ₂ Se > H ₂ Te c. The reducing nature of H ₂ ~S , H ₂ Se and H ₂ Te follow the order : H ₂ ~S < H ₂ Se < H ₂ Te The correct statement are:
Options
- Aa, b, c
- Ba,b
- Cb, c
- Da, c
Correct answer
D. a, c
Step-by-step solution
- a. The thermal stability of hydrides of group 16 elements follows the order: ( H ₂ O > H ₂ ~S > H ₂ Se > H ₂ Te ) This is correct. As you go down the group, the central atom's size increases, and the E-H bond length increases. The bond becomes weaker and easier to break with heat, so thermal stability decreases. - b. The acidic nature of hydrides of group 16 elements follows the order: ( H ₂ O > H ₂ ~S > H ₂ Se > H ₂ Te ) This is incorrect. The acidic nature increases down the group. As the E-H bond becomes weake