Question:
An indicator ' X ' is used for studying the effect of variation in concentration of iodide : on the rate of reaction of iodide ion with $H_2O_2 $ at room temp. The indicator ' X ' forms blue colored complex with compound ' A ' present in the solution. The indicator ' X ' and compound 'A' respectively are
An indicator ' X ' is used for studying the effect of variation in concentration of iodide : on the rate of reaction of iodide ion with $H_2O_2 $ at room temp. The indicator ' X ' forms blue colored complex with compound ' A ' present in the solution. The indicator ' X ' and compound 'A' respectively are
Updated On: Mar 20, 2025
Methyl orange and \(H_2O_2\)
- Starch and iodine
Starch and \(H_2O_2\)
- Methyl orange and iodine
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The Correct Option is B
Solution and Explanation
In this reaction, iodine (\(\text{I}_2\)) is produced as a product when \(\text{I}^-\) reacts with \(\text{H}_2\text{O}_2\). Starch is commonly used as an indicator because it forms a blue-colored complex with iodine. The reaction steps are as follows:
\[ \text{I}^- + \text{H}_2\text{O}_2 \rightarrow \text{I}_2 + \text{H}_2\text{O} \] \[ \text{I}_2 + \text{Starch} \rightarrow \text{Blue complex} \]
Thus, the indicator is starch, and the compound forming the blue complex is iodine.
\[ \text{I}^- + \text{H}_2\text{O}_2 \rightarrow \text{I}_2 + \text{H}_2\text{O} \] \[ \text{I}_2 + \text{Starch} \rightarrow \text{Blue complex} \]
Thus, the indicator is starch, and the compound forming the blue complex is iodine.
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Concepts Used:
Biomolecules
Biomolecules are the most essential organic molecules, which are involved in the maintenance and metabolic processes of living organisms. These non-living molecules are the actual foot-soldiers of the battle of sustenance of life.
There are four major classes of Biomolecules – Carbohydrates, Proteins, Nucleic acids and Lipids.
- Carbohydrates are chemically defined as polyhydroxy aldehydes or ketones or compounds which produce them on hydrolysis.
- Proteins are another class of indispensable biomolecules, which make up around 50per cent of the cellular dry weight. Proteins are polymers of amino acids arranged in the form of polypeptide chains. The structure of proteins is classified as primary, secondary, tertiary and quaternary in some cases.
- Nucleic acids refer to the genetic material found in the cell that carries all the hereditary information from parents to progeny. There are two types of nucleic acids namely, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The main function of nucleic acid is the transfer of genetic information and synthesis of proteins by processes known as translation and transcription.
- Lipids are organic substances that are insoluble in water, soluble in organic solvents, are related to fatty acids and are utilized by the living cell.