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Due to improper / indiscriminate disposal of old and used computers or their parts, which of the following are released into the environment as e-waste?

1. Beryllium
2. Cadmium
3. Chromium
4. Heptachlor
5. Mercury
6. Lead
7. Plutonium

Select the correct answer using the codes given below.
(a) 1, 3, 4, 6 and 7 only
(b) 1, 2, 3,5 and 6 only
(c) 2, 4, 5 and 7 only
(d) 1, 2, 3, 4, 5, 6 and 7



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Improper or indiscriminate disposal of old and used computers or their parts can result in the release of various harmful substances into the environment. These substances are collectively known as e-waste.

The given options indicate different substances that can be released as e-waste:

Beryllium: Beryllium is a toxic metal commonly found in electronic components. It can cause respiratory and lung diseases if released into the environment.

Cadmium: Cadmium is a highly toxic heavy metal present in computer batteries and circuit boards. It can contaminate soil and water, posing risks to human health and the environment.

Chromium: Chromium is often used as a coating in computer parts. It can be released as a hazardous waste and can have detrimental effects on human health and ecosystems.

Mercury: Mercury is commonly found in computer monitors, switches, and other electronic devices. It is a potent neurotoxin that can accumulate in the food chain and cause severe health issues.

Lead: Lead is a well-known hazardous substance found in computer batteries, solder, and other components. It can cause developmental issues in children and pose risks to human health and the environment.

The substances mentioned in options 4 (Heptachlor) and 7 (Plutonium) are not typically associated with e-waste. Heptachlor is an insecticide, and plutonium is a radioactive element commonly used in nuclear reactors.


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