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(a). IF both (A) and (R) are correct and...

(a). IF both (A) and (R) are correct and (R) is the correct explanation of (A).
(b). If both (A) and (R) are correct but (R) is not the correct explanation of (A).
(c). If (A) is correct, but (R) is incorrect.
(d). If (A) is incorrect, but (R) is correct. ltbr. (e) if both (A) and (R) are incorrect.
Q. Assertion (A): `H_(3)PO_(2)` is mono basic acid.
Reason (R): Two H-atoms are attached to pghosphorous (P).

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the assertion (A) and reason (R) about the compound \( H_3PO_2 \), we will analyze both statements step by step. ### Step 1: Analyze Assertion (A) **Assertion (A):** \( H_3PO_2 \) is a monobasic acid. - **Explanation:** A monobasic acid is defined as an acid that can donate only one proton (H⁺) per molecule in an aqueous solution. - In the case of \( H_3PO_2 \), we can examine its structure. The compound has one hydroxyl group (-OH) that can release a proton. Thus, it can donate only one H⁺ ion, confirming that it is indeed a monobasic acid. ### Step 2: Analyze Reason (R) **Reason (R):** Two H-atoms are attached to phosphorus (P). - **Explanation:** The structure of \( H_3PO_2 \) can be represented as: \[ \text{P} = \text{O} \\ | \\ \text{OH} \\ | \\ \text{H} \\ | \\ \text{H} \] - In this structure, phosphorus is bonded to two hydrogen atoms and one hydroxyl group. Therefore, the statement that two H-atoms are attached to phosphorus is correct. ### Step 3: Determine the Relationship Between (A) and (R) - Since both the assertion (A) is correct (as \( H_3PO_2 \) is indeed a monobasic acid) and the reason (R) is also correct (two H-atoms are attached to phosphorus), we need to evaluate if (R) correctly explains (A). - The reason (R) explains that the presence of two H-atoms attached to phosphorus contributes to the monobasic nature of the acid. However, the monobasic character is primarily due to the presence of only one -OH group that can donate a proton. ### Conclusion - Both (A) and (R) are correct. - However, (R) is not the correct explanation of (A) because the monobasic nature is due to the presence of one -OH group, not merely the number of H-atoms attached to phosphorus. ### Final Answer The correct option is: **(b)** If both (A) and (R) are correct but (R) is not the correct explanation of (A).
To solve the question regarding the assertion (A) and reason (R) about the compound \( H_3PO_2 \), we will analyze both statements step by step. ### Step 1: Analyze Assertion (A) **Assertion (A):** \( H_3PO_2 \) is a monobasic acid. - **Explanation:** A monobasic acid is defined as an acid that can donate only one proton (H⁺) per molecule in an aqueous solution. - In the case of \( H_3PO_2 \), we can examine its structure. The compound has one hydroxyl group (-OH) that can release a proton. Thus, it can donate only one H⁺ ion, confirming that it is indeed a monobasic acid. ...
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