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Negative ions are known as...

Negative ions are known as

A

Cations

B

Anions

C

Fermions

D

None of these

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Compounds which are covalent but develop ions in solution are known as ...................

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Which of the following statement are correct for the ionic solids in which positive and negative ions are held by strong electrostatic attractive forces ?

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Any deviation from the perfectly ordered arrangement constitutes a defect or imperfection. The compounds in which the number of irregularity are present in the arrangement of atoms or ions are called atomic imperfections or point defects. These may be stochiometric or non - stoichlometric. Stoichiometric defects are further classified into Schottky defects in which number of positive and negative ions are missing in equal ratio and Frenkel defects in which an ion leaves its correct lattice sites and occupies on interstitial site. Schottky defect is more common in ionic compounds with high co-ordination number and where the size of positive and negative ions are almost equal, while in Frenkel defects are common in ionic compounds, which have low co-ordination number and in which there is large difference in size between positive and negative ions. In a crystal some ions are missing from normal sites. This is an example of

Any deviation from the perfectly ordered arrangement constitutes a defect or imperfection. The compounds in which the number of irregularity are present in the arrangement of atoms or ions are called atomic imperfections or point defects. These may be stochiometric or non - stoichlometric. Stoichiometric defects are further classified into Schottky defects in which number of positive and negative ions are missing in equal ratio and Frenkel defects in which an ion leaves its correct lattice sites and occupies on interstitial site. Schottky defect is more common in ionic compounds with high co-ordination number and where the size of positive and negative ions are almost equal, while in Frenkel defects are common in ionic compounds, which have low co-ordination number and in which there is large difference in size between positive and negative ions. Which of the following defect, if present, lowers the density of the crystal ?

Statement I: In any ionic solid [MX] with Schottky defect, the number of positive and negative ions are same. Statement II: An equal number of cation and anion vacancies is present.

Statement I: In any ionic solid [MX] with Schottky defect, the number of positive and negative ions are same. Statement II: An equal number of cation and anion vacancies is present.

The outermost shell of an atom is known as its .................... and the electrons in it are known as ......................

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