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The correct order of increasing pH value of the aqueous solutions of baking soda, rock salt, washing soda and slaked lime is

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Baking soda

<

Rock salt

<

Washing soda

<

Slaked lime

Rock salt

<

Baking soda

<

Washing soda

<

Slaked lime

<

Washing soda

<

Rock salt

<

Baking soda

Washing soda

<

Baking soda

<

Rock salt

<

Slaked lime

answer is B.

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Detailed Solution

According to pH values the increasing order is

Rock salt $<$ Baking soda $<$ Washing soda $<$ Slaked lime

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