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JEE Main 20188 April
Exam
JEE Main
Year
2018
Date
8 April
Subject
Chemistry
Chapter
Redox Reactions

JEE Main 2018 · 8 April · Chemistry · Redox Reactions

An alkali is titrated against acid with methyl orange as an...

An alkali is titrated against acid with methyl orange as an indicator, which of the following is a correct combination?

Options

  1. A{BaseAcidEndpointStrongStrongPinktocolourless\begin{cases}Base & Acid & Endpoint \\ Strong & Strong & Pinktocolourless\end{cases}
  2. B{BaseAcidEndpointWeakSrtongColourlesstopink\begin{cases}Base & Acid & Endpoint \\ Weak & Srtong & Colourlesstopink\end{cases}
  3. C{BaseAcidEndpointStrongstrongPinkishredtoyellow\begin{cases}Base & Acid & Endpoint \\ Strong & strong & Pinkishredtoyellow\end{cases}
  4. D{BaseAcidEndpointWeakStrongYellowtopinkishred\begin{cases}Base & Acid & Endpoint \\ Weak & Strong & Yellowtopinkishred\end{cases}

Correct answer

D. {BaseAcidEndpointWeakStrongYellowtopinkishred\begin{cases}Base & Acid & Endpoint \\ Weak & Strong & Yellowtopinkishred\end{cases}

Step-by-step solution

The pHpHrange between3.13 . 1 (red)and4.4and 4 . 4(yellow) is the colour-change interval of methyl orange.

Weak base has pH>7pH > 7. So, when methyl orange indicator is added the solution turns yellow & if the solution is titrated against strong acid it turns pinkish red at the end point i.e., pH<3.1pH < 3 . 1.

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