The correct statement for the molecule, CsI3 is:a)It is a covalent molecule.b)It contains Cs+ and I3- ions.c)It contains Cs3+ and I– ions.d)It contains Cs+, I– and lattice I2 molecules.Correct answer is option 'B'. Can you explain this answer?

Question

Answer

Csl₃, dissociates as Csl₃ → Cs⁺ + I₃^-

Answer

CsI3 is a covalent molecule, as it contains Cs and I3- ions.

Explanation:

Introduction:
CsI3 is the chemical formula for cesium triiodide. To determine the correct statement for this molecule, we need to understand its composition and bonding.

Composition:
CsI3 consists of cesium (Cs) and iodine (I) atoms. The subscript 3 in the formula indicates that there are three iodine atoms in the molecule.

Bonding:
The nature of the bonding in a compound can be determined by analyzing the electronegativity difference between the atoms involved. Electronegativity is a measure of an atom's ability to attract shared electrons in a chemical bond.

Covalent bonding:
When the electronegativity difference between two atoms is small (less than 1.7), the bond formed is considered covalent. In a covalent bond, atoms share electrons to achieve a stable electron configuration.

Ionic bonding:
When the electronegativity difference between two atoms is large (greater than 1.7), the bond formed is considered ionic. In an ionic bond, one atom transfers electrons to another atom to achieve a stable electron configuration. This leads to the formation of positively charged cations and negatively charged anions.

Analysis:
In the case of CsI3, cesium (Cs) has an electronegativity of 0.79, while iodine (I) has an electronegativity of 2.66. The electronegativity difference between cesium and iodine is 1.87, which is relatively large.

According to the electronegativity difference, CsI3 would be expected to have ionic bonding. This means that CsI3 is likely to contain Cs+ cations and I3- anions.

Correct statement:
The correct statement for the molecule CsI3 is that it contains Cs and I3- ions. This indicates that CsI3 is an ionic compound, rather than a covalent molecule.

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