JEE MAIN - Chemistry (2023 - 11th April Morning Shift - No. 11)
For compound having the formula $$\mathrm{GaAlCl}_{4}$$, the correct option from the following is :
$$\mathrm{Cl}$$ forms bond with both $$\mathrm{Al}$$ and $$\mathrm{Ga}$$ in $$\mathrm{GaAlCl}_{4}$$
Oxidation state of $$\mathrm{Ga}$$ in the salt $$\mathrm{GaAlCl}_{4}$$ is +3 .
$$\mathrm{Ga}$$ is coordinated with $$\mathrm{Cl}$$ in $$\mathrm{GaAlCl}_{4}$$
$$\mathrm{Ga}$$ is more electronegative than $$\mathrm{Al}$$ and is present as a cationic part of the salt $$\mathrm{GaAlCl}_{4}$$
Explanation
Option A : Cl forms bond with both Al and Ga in GaAlCl4
- This is incorrect. In GaAlCl4, chloride ions (Cl-) form bonds with Al to create the AlCl4- ion. There is an ionic bond between the Ga+ cation and the AlCl4- anion.
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Option B : The oxidation state of Ga in the salt GaAlCl4 is +3
- This is incorrect. The oxidation state of Ga in GaAlCl4 is actually +1.
Option C : Ga is coordinated with Cl in GaAlCl4
- This is incorrect. Ga is not coordinated with Cl. The Ga+ ion forms an ionic bond with the AlCl4- ion.
Option D : Ga is more electronegative than Al and is present as a cationic part of the salt GaAlCl4
- This is correct. According to the Pauling scale, aluminum (Al) has an electronegativity of 1.61 and gallium (Ga) has an electronegativity of 1.81, which makes Ga more electronegative than Al, and Ga exists as a cationic part (Ga+) in the compound.
- This is incorrect. In GaAlCl4, chloride ions (Cl-) form bonds with Al to create the AlCl4- ion. There is an ionic bond between the Ga+ cation and the AlCl4- anion.
Option B : The oxidation state of Ga in the salt GaAlCl4 is +3
- This is incorrect. The oxidation state of Ga in GaAlCl4 is actually +1.
Option C : Ga is coordinated with Cl in GaAlCl4
- This is incorrect. Ga is not coordinated with Cl. The Ga+ ion forms an ionic bond with the AlCl4- ion.
Option D : Ga is more electronegative than Al and is present as a cationic part of the salt GaAlCl4
- This is correct. According to the Pauling scale, aluminum (Al) has an electronegativity of 1.61 and gallium (Ga) has an electronegativity of 1.81, which makes Ga more electronegative than Al, and Ga exists as a cationic part (Ga+) in the compound.
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