Chemistry of Our Environment- Water

Open Ended

How water is polluted in the area you are living & what are the common water pollutants?

Multiple Choice

What is the colour change when water is added anhydrous cobalt (II) chloride paper?

• blue to white

• white to blue

• blue to pink

• pink to blue

Multiple Choice

What is the colour change when water is added anhydrous copper (II) sulfate?

• blue to white

• white to blue

• blue to pink

• pink to blue

Open Ended

Suggest why tap-water is not a suitable solvent to use in the laboratory experiments?

Multiple Select

Which of the following substances present in natural water are beneficial?

• dissolved oxygen

• calcium ions

• plastics

• nitrates

• lead

Multiple Select

Which of the following substances present in natural water are harmful?

• dissolved oxygen

• iron ions

• plastics

• nitrates

• lead

Open Ended

During the water treatment, why water is needed to pass through activated carbon filter?

Open Ended

During the water treatment, what we can do to remove any harmful waterborne microbes?