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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
MCQ
Which of the following statements are correct?
  • A
    Helium has the highest first ionisation enthalpy in the periodic table.
  • B
    Chlorine has less negative electron gain enthalpy than fluorine.
  • C
    Mercury and bromine are liquids at room temperature.
  • D
    In any period, atomic radius of alkali metal is the highest.
✓

Answer

  1. Helium has the highest first ionisation enthalpy in the periodic table.
  1. Mercury and bromine are liquids at room temperature.
  2. In any period, atomic radius of alkali metal is the highest.

Explanation:

Chlorine has more negative electron gain enthalpy than fluorine due to bigger size and lesser electronic repulsion.

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