Question

1 point (VIII) Assertion : HCl is a stronger acid than acetic acid. Reason: On dissociation, HCl yields lesser hydrogen ions for the same concentration as compared to acetic acid. * O (a) Both A and R are true and R is the correct explanation of A. O (b) Both A and Rare true but is not the correct explanation of A O (c) A is true but Ris false. O (d) A is false but Ris true. .​

Answer 1

Answer:

Explanation:

Hint: pH is a scale used to specify the acidity or basicity of a solution. Acids or acidic solutions have lower pH values than bases or basic solutions. Strong acids will have pH values less than weak acids. Hydrochloric acid is a stronger acid compared to acetic acid. The lower the pH value, the higher is the concentration of hydrogen ions (protons) in the solution. Use this info to state whether the assertion and reason are correct or not.

Complete step by step solution: Concentration of an acid is a measure of the amount of acid ions dissolved in a solvent.

Hydrochloric acid (HCl) is a stronger acid than acetic acid (CH3COOH).

Here, when the concentrations of CH3COOH and HCl are the same, the pH of HCl will definitely be less than that of CH3COOH as HCl is a stronger acid.

Therefore, the given assertion is correct.

Equimolar solution is a solution where the no. of solute particles of different compounds is the same.

When equal amounts of HCl and CH3COOH are dissolved in a solution, then the no. of titratable protons present in HCl is greater than that of CH3COOH. Because as HCl is a stronger acid, it will produce more no. of protons (hydrogen ions H+) than CH3COOH. Hydrogen ion concentration is higher in HCl than in acetic acid.

Therefore, the given reason is incorrect.

Assertion is correct but reason is incorrect.

Hence, the correct option is Option C.

Note: Assertion means a statement and reason is the explanation about that particular statement. You have to find out whether each statement is correct or not. If both the statements are correct, you have to find out whether the reason supports the assertion or not. Do not confuse in answering these types of questions. “Equimolar” is the same as “same concentration”.

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Answer 2

(c) A is true but Ris false.

• HCl is known to be a highly corrosive acid. It's pH value is 1. It is stronger than acetic acid because it dissociates almost completely in. Since, acetic acid is a weak acid it cannot be dissociated properly into free H+ ions. Hence, the given assertion is true.
• The given reason is false because as mentioned above HCl dissociates completely into H+ ions in water unlike acetic acid which doesn't.
• Hence, (c) A is true but R is false.