Assertion :In the titration of ${N a}_{2} C O_{3}$ with $H C l$ using methyl orange indicator, the volume of acid required is twice that of the acid required using phenolphthalein as indicator. Reason: Two moles of $H C l$ is required for the complete neutralisation of one mole of ${N a}_{2} C O_{3}$ .

Assertion is correct but Reason is wrong

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Assertion is wrong but Reason is correct

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Both Assertion and Reason are correct and Reason is correct explanation of Assertion

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Both Assertion and Reason are correct but Reason is not correct explanation of Assertion

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Solution

The correct option is D Both Assertion and Reason are correct but Reason is not correct explanation of Assertion
Methyl orange indicates at complete neutralisation while phenolphthalein indicates at first equivalence point. So, volume of acid required is twice in case of methyl orange.
Methyl orange is used for the following reaction:
${N a}_{2} C O_{3} + 2 H C l \to 2 N a C l + H_{2} O + C O_{2}$
Phenophthalein is used for the following reaction:
${N a}_{2} C O_{3} + H C l \to N a H C O_{3} + N a C l + C O_{2}$

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Similar questions

Q. Assertion :In the titration of

{N a}_{2} {C O}_{3}

with

H C l

using methyl orange indicator, the volume of the acid required at the equivalence point is twice that of the acid required using phenolphthalein as indicator. Reason: Two moles of

H C l

are required for the complete neutralisation of one mole of

{N a}_{2} {C O}_{3}

Q. Assertion :In the titration of

N a_{2} C O_{3}

with

H C l

using methyl orange indicator, the volume required at the equivalence point is twice that of the acid required using phenolphthalein indicator. Reason:

2

mol of

H C l

am required for complete neutralization of one mol of

N a_{2} C O_{3}

Assertion (A) Ethanol is a weaker acid than phenol.
Reason (R) Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion (A) Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid.
Reason (R) Lewis acid polarises the bromine molecule.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion (A) Addition reaction of water to but-1-ene in acidic medium yields butan-1-ol.
Reason (R) Addition of water in acidic medium proceeds through the formation of primary carbocation.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Assertion :In the titration of Na2CO3 with HCl using methyl orange indicator, the volume of acid required is twice that of the acid required using phenolphthalein as indicator. Reason: Two moles of HCl is required for the complete neutralisation of one mole of Na2CO3.