Question:
Consider the following statements:
Statement - I: In three dimensional network of \(SiO_2\), if few Si atoms are replaced by Al atoms, the resulting structure acquires a positive charge.
Statement - II: Silicones are organo - silicon polymers which have \((R_2SiO)\) as a repeating unit.
Consider the following statements:
Statement - I: In three dimensional network of \(SiO_2\), if few Si atoms are replaced by Al atoms, the resulting structure acquires a positive charge.
Statement - II: Silicones are organo - silicon polymers which have \((R_2SiO)\) as a repeating unit.
Statement - I: In three dimensional network of \(SiO_2\), if few Si atoms are replaced by Al atoms, the resulting structure acquires a positive charge.
Statement - II: Silicones are organo - silicon polymers which have \((R_2SiO)\) as a repeating unit.
Show Hint
Aluminum in silicate networks creates negative charges (aluminosilicates), which must be balanced by cations like \(Na^+\) or \(Ca^{2+}\).
Updated On: Jun 9, 2026
- Both statements - I and II are correct
- Statement - I is correct but Statement - II is not correct
- Statement - I is not correct but Statement - II is correct
- Both statements - I and II are not correct
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Concept:
Silicates and silicones are important silicon-based structures used in industrial and natural chemistry.
Step 1: Evaluate Statement I.
In the network of \(SiO_2\) (quartz), replacing \(Si^{4+}\) with \(Al^{3+}\) creates an excess of negative charge because Al has a lower oxidation state than Si. \[ \text{Si}^{4+} \rightarrow \text{Al}^{3+} + \text{negative charge} \] The resulting structure becomes anionic, making Statement I incorrect.
Step 2: Evaluate Statement II.
Silicones are synthetic organosilicon polymers. \[ \text{Repeating unit} = (R_2SiO)_n \] Statement II is correct. \[ \boxed{\text{Statement - I is not correct but Statement - II is correct}} \]
Step 1: Evaluate Statement I.
In the network of \(SiO_2\) (quartz), replacing \(Si^{4+}\) with \(Al^{3+}\) creates an excess of negative charge because Al has a lower oxidation state than Si. \[ \text{Si}^{4+} \rightarrow \text{Al}^{3+} + \text{negative charge} \] The resulting structure becomes anionic, making Statement I incorrect.
Step 2: Evaluate Statement II.
Silicones are synthetic organosilicon polymers. \[ \text{Repeating unit} = (R_2SiO)_n \] Statement II is correct. \[ \boxed{\text{Statement - I is not correct but Statement - II is correct}} \]
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