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- Which of the following statement is not correct?Option: 1 The first ionisation energies (in kJ/mol) of carbon, silicon, germanium, tin and lead are 1
- #Joint Entrance Examination Main
- #Class 11
- #Chemistry
- #National Eligilibility Cum Entrance Test
- #Engineering
- #Classification of Elements and Periodic table
Which of the following statement is not correct?
The first ionisation energies (in kJ/mol) of carbon, silicon, germanium, tin and lead are 1086, 786, 761, 708 and 715 respectively.
Down the group, electronegativity decreases from B to Ti in boron family.
Among oxides of the elements of carbon family, CO is neutral, is acidic and SnO is amphoteric.
The 4f- and 5f- inner transition elements are placed separately at the bottom of the periodic table to maintain its structure.
Answers (1)
Variation of electronegativity along group -
Electronegativity generally decreases down a group in the periodic table.
- wherein
e.g. from fluorine to astatine.
Scale of electronegativity -
A number of numerical scales of electronegativity of elements have been developed.
- wherein
e.g. Pauling scale, Mulliken, Jaffe scale etc.
(A), (C) and (D) are correct statements
(B) first decreases from and then increases marginally owing to discrepancies in atomic size of the element.
Therefore, Option(2) is correct
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