AP EAMCET202023 Sep 2020Morning ShiftChemistryStates of MatterActual
Match the following elements, given as hints to their first, second ionization enthalpies and electron gain enthalpies. List- I List- II i ) Most reactive non-metal A ) ∆ H 1 = 419 , ∆ H 2 = 3051 , ∆ Eg H = - 48 ii ) Most reactive metal B ) ∆ H 1 = 1681 , ∆ H 2 = 3374 , ∆ Eg H = - 328 iii ) Least reactive element C ) ∆ H 1 = 738 , ∆ H 2 = 1451 , ∆ Eg H = - 40 iv )
Options
- A( i - B ) , ( i   i - A ) , ( i   i   i - D ) , ( i   v - C )
- B( i - A ) , ( i   i - B ) , ( i   i   i - D ) , ( i   v - C )
- C( i - B ) , ( i   i - A ) , ( i   i   i - C ) , ( i   v - D )
- D( i - B ) , ( i   i - D ) , ( i   i   i - A ) , ( i   v - C )
Correct answer
A. ( i - B ) , ( i   i - A ) , ( i   i   i - D ) , ( i   v - C )
Step-by-step solution
Most reactive non-metal is B as it has highest negative electron gain enthalpy. Most reactive metal is A as it has the least first ionization enthalpy. The least reactive element is D as it has high ionization energy and positive electron gain enthalpy. Metal forming binary halide is C as it has comparable successive ionization energy.