Some Basic Concepts of Chemistry - Result Question 26
Assertion and Reason
Read the following questions and answer as per the direction given below :
(a) Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I.
(b) Statement I is true; Statement II is true; Statement II is not the correct explanation of Statement I.
(c) Statement I is true; Statement II is false.
(d) Statement I is false; Statement II is true.
26. Statement I
In the titration of $Na _2 CO _3$ with $HCl$ using methyl orange indicator, the volume required at the equivalence point is twice that of the acid required using phenolphthalein indicator.
Statement II Two moles of $HCl$ are required for the complete neutralisation of one mole of $Na _2 CO _3$.
(1991, 2M)
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Answer:
Correct Answer: 26. (b)
Solution:
- Both assertion and reason are factully true but the reason does not exactuly explain the assertion. The correct explation is, methyl orange and phenolphtalein changes their colour at different pH.
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