Assertion (A) : If aluminium atoms replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquires a negative charge
Reason (R) : Aluminium is trivalent while silicon is tetravalent.
Assertion (A) : If aluminium atoms replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquires a negative charge
Reason (R) : Aluminium is trivalent while silicon is tetravalent.
Reason (R) : Aluminium is trivalent while silicon is tetravalent.
A
Both A and R are correct and R is the correct explanation of A
B
Both A and R are correct but R is not the correct explanation of A
C
Both A and R are not correct
D
A is not correct but R is correct
Text Solution
AI Generated Solution
The correct Answer is:
To solve the assertion and reason question, let's break down the concepts step by step:
### Step 1: Understand the Assertion
The assertion states that if aluminum atoms replace a few silicon atoms in the three-dimensional network of silicon dioxide (SiO2), the overall structure acquires a negative charge.
### Step 2: Understand the Structure of Silicon Dioxide
Silicon dioxide has a three-dimensional network structure where each silicon atom (Si) is tetrahedrally coordinated to four oxygen atoms (O). Each oxygen atom is also shared between two silicon atoms. This structure is stable and neutral overall.
### Step 3: Analyze the Replacement of Silicon with Aluminum
When an aluminum atom (Al), which is trivalent, replaces a silicon atom, it can only form three bonds with the surrounding oxygen atoms.
### Step 4: Identify the Consequence of the Replacement
Since aluminum can only form three bonds, one of the oxygen atoms that would normally bond with silicon is left without a bond. This unbonded oxygen has a lone pair of electrons, which contributes to a negative charge in the structure.
### Step 5: Conclusion on the Assertion
Thus, the assertion is correct: replacing silicon with aluminum in SiO2 does lead to the development of a negative charge in the overall structure due to the presence of the unbonded oxygen atom.
### Step 6: Understand the Reason
The reason states that aluminum is trivalent while silicon is tetravalent. This is also correct. Silicon (Si) can form four bonds (tetravalent), while aluminum (Al) can only form three bonds (trivalent).
### Step 7: Connect the Reason to the Assertion
The reason explains why the assertion is true: the trivalency of aluminum leads to the formation of a negative charge when it replaces silicon in the SiO2 structure.
### Final Conclusion
Both the assertion and the reason are true, and the reason correctly explains the assertion. Therefore, the correct answer is that both the assertion and reason are true, and the reason is the correct explanation for the assertion.
To solve the assertion and reason question, let's break down the concepts step by step:
### Step 1: Understand the Assertion
The assertion states that if aluminum atoms replace a few silicon atoms in the three-dimensional network of silicon dioxide (SiO2), the overall structure acquires a negative charge.
### Step 2: Understand the Structure of Silicon Dioxide
Silicon dioxide has a three-dimensional network structure where each silicon atom (Si) is tetrahedrally coordinated to four oxygen atoms (O). Each oxygen atom is also shared between two silicon atoms. This structure is stable and neutral overall.
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Assertion:According to mendeleev,the properties of elements are a periodic function of their atomic weights. Reason:Mendeleev left the gap under aluminium and a gap under silicon,and called these elements Eka-Aluminium and Eka-silicon. (A)If both assertion and reason are true and reason is the correct explanation of assertion. (B)If both assertion and reason are true but reason is not the correct explanation of assertion. (C)if assertion is true and reason is false. (D)both are false
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A
If both assertion and reason are true and reason is the correct explanation of assertion.
B
If both assertion and reason are true but reason is not the correct explanation of assertion.
C
if assertion is true and reason is false.
D
both are false
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