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Q.

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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a

Baking soda  < Rock salt  < Washing soda   <Slaked lime

b

Rock salt <  Baking soda <  Washing soda <  Slaked lime

c

Slaked lime  < Washing soda  < Rock salt <  Baking soda

d

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 <aking soda  < Washing soda <  Slaked lime

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