A group of students accompanied by their science teacher went trekking. After reaching the top of the hill they felt hungry. The Teacher told them that they would have to bear the hunger as cooking of food is slow and takes a longer time at the top of the hill. The students wanted to known the reason for the above fact. The Teacher explained the reason for the above fact till the food was cooked. Can you predict the explanation given by the teacher?

Explanation

(i)Jatinder expressed concern regarding protection of our rivers and other waterways from pollution.
(ii)Detergents are sodium or potassium salts of benzenesulphonic acid
(iii)Polyphosphates are added to detergents to soften water. They form soluble complexes with `Cu^(2+)` and `Mg^(2+)` ions thereby making them ineffective.
`2Ca^(2+)+ underset("Sod. hexametaphosphate")(Na_2[Na_4(PO_3)_6])to underset("Soluble complex ")(Na_2[Ca_2(PO_3)_6])+4Na^(+)`
`2Mg^(2+) + Na_2[Na_4(PO_3)_6] to underset("Soluble complex")(Na_2[Mg_2(PO_3)_6])+4Na^(+)`
These polyphosphates nourish bacteria which grow excessively and deplete water of dissolved oxygen
thus killing fish and other small aquatic animals.