Wood or cattle dung ash is used for cleaning cooking utensils in many parts of India. The statement that is not true for this ash is :

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several chemical components of ash remain undissolved as solids in water and these solids help in cleaning by providing scrubbing action

when added to water, it forms alkaline solution with pH - 8 and above, which helps to remove oily substances from the utensils

It largely consists of metal oxides and silicates because non-metals are removed as gaseous compounds during burning of the wood/dung cakes

if left moist for a few hours in air, it slowly turns acidic because of oxidative decomposition

answer is D.

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Detailed Solution

The statement that is not true for this ash is "if left moist for a few hours in air, it slowly turns acidic because of oxidative decomposition"

In several regions of India, cooking utensils are cleaned with wood or animal dung ash. Since non-metals are eliminated during the burning of the wood/dung cakes, the majority of it is made up of metal oxides and silicates.

When combined with water, it creates an alkaline solution with a pH of 8 or higher, which aids in the removal of greasy substances from utensils.

A number of the chemical elements of ash are still present as solids in the water, and these particles aid in cleaning by providing a scouring effect.

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