Choose the incorrect statement.
Correct answer: B. BeF2 forms a complex compound with excess NaF, in which the complex entity containing Be, is a cation.
- A. BeCO3 is preserved in an atmosphere of CO2 as it is thermally least stable.
- B. BeF2 forms a complex compound with excess NaF, in which the complex entity containing Be, is a cation.
- C. Beryllium dissolves in an alkali to form [Be(OH)4]2-
- D. Beryllium exhibits no diagonal relationship with sodium.
Explanation
Option B is correct.Beryllium fluoride (BeF2) forms a complex compound with excess sodium fluoride (NaF), in which the complex entity containing Be is an anion. The complex is called sodium tetrafluoroberyllate (Na2[BeF4]2-). The formation of the complex can be represented by the following equation:BeF2 + 2NaF → Na2[BeF4]2- In the complex, the beryllium ion (Be2+) is surrounded by four fluoride ions (F-). The beryllium ion has a charge of +2, while each fluoride ion has a charge of -1. The overall charge of the complex is -2. The complex is an anion because it has a negative charge. The negative charge is due to the presence of the four fluoride ions. The fluoride ions are attracted to the beryllium ion because of the opposite charges.
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The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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