The approximate LD50 of the least toxic substance will be 130 mg/Kg.
- The dose necessary to cause the death of 50% of a population under test after a predetermined test period is known as the LD50 value for a drug.
- Commonly used as a broad indicator of a substance's acute toxicity are LD50 values.
- Greater toxicity is indicated by a lower LD50. A low LD50 of 500 mg/kg or less implies severe toxicity.
- Moderate toxicity is indicated by an LD50 of 500 to 1,000 mg/kg. A modest toxicity level of 1,000 to 2,000 mg/kg is indicated.
- The species is especially vulnerable to the poison if the LD50 is low. The lethal dose (LD50) of a specific poison might change significantly between several animal species.
- Thus out of all the options, LD50 130 mg/kg will have the lowest toxicity and 20 mg/kg will be the highest.
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<u>Answer:</u>
Collection of data is the part of an observational study.
Option: (c)
<u>Explanation:</u>
- Observational study is the non-experimental research that is usually used in the investigation of certain effects that is due to the treatment.
- The observational study is qualitative study. The major part of the observational study is to collect data and analyze it properly.
- It is used in many fields like sociology, psychology and statistical aspects.
- Mainly there are three types of observational study: cross-sectional, case-control and cohort study.
The bond between NaCl is called an ionic bond. This type of bonding involves the complete transfer of the valence electrons in an atom. The metal atom loses some of its electrons making the atom a positive ion while the nonmetal accepts the electrons making it a negative ion.
