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.

The correct answer is B because Beryllium, Cadmium, Chromium, Mercury, and Lead are all hazardous heavy metals or their compounds commonly found in various components of electronic waste (e-waste).

Analysis of each statement:

1. Beryllium: Used in connectors, switches, and some alloys in electronics. Correct.
2. Cadmium: Found in rechargeable batteries (NiCd), switches, and older CRT monitors. Correct.
3. Chromium: Used in steel alloys, corrosion protection, and some pigments in electronics. Hexavalent chromium is a particular concern. Correct.
4. Heptachlor: This is an organochlorine insecticide, not a component of computers or electronics. Incorrect.
5. Mercury: Used in switches, fluorescent lamps (e.g., backlights in older LCDs), and some batteries. Correct.
6. Lead: Historically a major component in solder, CRT glass, and some batteries. Correct.
7. Plutonium: A radioactive element associated with nuclear applications, not consumer electronics. Incorrect.

Therefore, the substances released into the environment as e-waste from the given list are Beryllium, Cadmium, Chromium, Mercury, and Lead (1, 2, 3, 5, and 6). This matches option B.