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p-Block Elements (Group 15–18)

JEE Main 2024 (Online) 30th January Evening ShiftMCQEasy📈 Topic in 27% papers+4−1
Ques. 1JEE Main 2024, 30 January (Evening Shift)

Choose the correct statements about the hydrides of group 15 elements. Choose the most appropriate from the options given below :

  1. C and D only
  2. A and D only
  3. A and B only
  4. B and C only

Answer

(3) A and B only

Solution

Down group 15: atomic size ↑ ⇒ E–H bond dissociation enthalpy ↓ (NH3 389 → BiH3 255 kJ mol-1)

A: weaker E–H bond ⇒ stability decreases NH3 → BiH3 ⇒ A is true

B: weaker E–H bond gives H more easily ⇒ reducing ability increases ⇒ B is true

C: reverse of B — BiH3 is the strongest, NH3 only mild ⇒ C is false

D: lone pair in a larger, diffuse orbital ⇒ basicity decreases NH3 > PH3 > AsH3 > SbH3 BiH3 ⇒ D is false

∴ A and B only

Answer: (3)

Keep practising — p-Block Elements (Group 15–18)

Ques. 2JEE Main 2024, 30 January (Evening Shift)

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: In the light of the above statements, choose the most appropriate from the options given below:

  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true but R is NOT the correct explanation of A.
  3. A is false but R is true.
  4. A is true but R is false.
Ques. 3JEE Main 2024, 29 January (Evening Shift)

Anomalous behavior of oxygen is due to its

  1. large size and low electronegativity
  2. small size and high electronegativity
  3. small size and low electronegativity
  4. large size and high electronegativity
Ques. 4JEE Main 2024, 27 January (Morning Shift)

Element not showing variable oxidation state is :

  1. Bromine
  2. Iodine
  3. Chlorine
  4. Fluorine
Ques. 5JEE Main 2024, 27 January (Evening Shift)

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Statement I is correct but Statement II is incorrect
  2. Both Statement I and Statement II are incorrect
  3. Statement I is incorrect but Statement II is correct
  4. Both Statement I and Statement II are correct
Ques. 6JEE Main 2024, 27 January (Evening Shift)

1 mole of PbS is oxidised by "X" moles of O3 to get "Y" moles of O2. X + Y = .

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