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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 Properties3 Marks
Question
  1. Arrange Fe, Fe2+, Fe3+ in increasing order of radii.
  2. Explain why Be has higher ionization enthalpy than B.
  3. Predict the formula of compound which might be formed by silicon and bromine.
✓

Answer

  1. Fe3+ < Fe2+ < Fe is an increasing order of ionic radii.
  2. Be (4) has electronic configuration 1s2 2s2 whereas B(5) has 1s2 2s2 2p1.

The energy required to remove electron from completely filled 2s orbital is higher than the energy required to remove electron from 2p orbital.

  1. SiBr4 is a formula of compound which might be formed by Si and Br2.

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