a- Which ions impart hardness to water? Na + Ca 2+ K + Mg 2+ Fe 3+ Cl - B- Prior

Question

a- Which ions impart hardness to water?

Na+

Ca2+

K+

Mg2+

Fe3+

Cl-

B-Prior to the Clean Water Act of 1977, the user was responsible for the quality of water.

-True

- False

C- What activity is the single largest user of water in the United States?

Homes

Industry

Thermoelectric power

Agriculture

D- Where does most of the water go that falls on the continental United States every day?

into our bodies

down the drains of our showers

into the ocean

back into the atmosphere

Na+

Ca2+

K+

Mg2+

Fe3+

Cl-

Explanation / Answer

(a) Ca2+, Mg2+ and Cl -

Chlorides, Sulphartes and Bicarbonates of Ca2+ and Mg2+ ions are responsible for hardness of water

(b) False

After this act only user was made responsible for cleasn water

(c) Thermo electric power

(d) into the ocean

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