What is the purpose of adding alum and lime to water during the process of water treatment
a. to cause particles in the water to clump together so that they can be removed
b. to increase the turbidity of water and raise its dissolved oxygen content
c. to kill unwanted bacteria in the water to prevent illness in humans
d. to lower the ph of the water to make it suitable for people to drink

A

Explanation:

Addition of Alum and lime helps clump particles for easy filtering process and seiving.

answer : (a) volume of the gas = 8.67 ×   l

                (b) second virial coefficient b = -1.21226 l/mole

solution :   given,     t = 300k

                                p = 20atm

                                z = 0.86

                                n = 8.2 mmoles = 8.2 × moles

                                r =   0.082 l atm/k/mol

        find,     (a) volume of gas   and (b) second virial coefficient b at 300k.

formula used :            

                          and            

(a)            

                    = \times 0.082\times 300}{20}[/tex]

                    = 8.67 ×   l

(b)      

                    = (0.00867-1) × 8.659

                    = - 8.5839 l/mole