Question

Milkman added a white powder to milk to delay its spoiling , this white powder commonly known as:

(a)Caustic soda (b) Acetic acid (c)Baking soda (d) Bleaching powder​

Answer 1

Answer:

Baking soda

Explanation:

Milkman added a white powder to milk to delay its spoiling , this white powder commonly known as Baking soda

Answer 2

Answer:

Baking Soda

Explanation:

In hot weather, milk can go 'off' very quickly due to rapid bacterial growth.. Even small amounts of lactic acid are quite distinctive with an acid sour taste, and even though it is not at all harmful, most people will reject the milk as 'bad' or having 'gone off'. If this can be removed, the milk will taste as usual and customers will accept it. This is why the milkman might add a trace of baking soda. Chemistry involved: Baking soda is a common name for sodium bicarbonate NaHCO3 [not to be confused with baking powder]. Lactic acid, systematic name 2-hydroxypropanoic acid, will be neutralised by the carbonate. ACID + CARBONATE = SALT + WATER + CARBON DIOXIDE CH3CH(OH)COOH + NaHCO3 = CH3CH(OH)COONa + H2O + CO2 Since this removes the unpleasant lactic acid taste, this makes the milk seem fresh. Baking soda is white like milk so it doesn't change its appearance.