JEE Main | 2018Ionic EquilibriumHard

Question

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

Options

A.

Base →Strong
Acid → Strong 
End point → Pinkish red to yellow

B.

Base →Weak
Acid → Strong 
End point → Yellow to pinkish red

C.

Base →Strong
Acid → Strong 
End point → Pink to colourless

D.

Base →Weak
Acid → Strong 
End point → Colourless to pink

Solution

Methyl orange shows Red(pinkish) color in 
Acidic medium & yellow color in basic
medium since original solution is basic so 
initial color ⇒ yellow
& Titrated with acid so
Final color ⇒ pinkish (red)

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