To determine whether [tex]$Na _2 Cr _2 O _7$[/tex] (Sodium Dichromate), Benedict's Reagent, and Tollen's Reagent are all common laboratory oxidizing agents, let's analyze their chemical properties and uses:
1. [tex]$Na_2Cr_2O_7$[/tex] (Sodium Dichromate):
- Sodium Dichromate is a well-known strong oxidizing agent. It is commonly used in various reactions where the oxidation of compounds is required, such as the oxidation of alcohols to ketones or carboxylic acids.
2. Benedict's Reagent:
- Benedict's Reagent is a chemical reagent used to test for the presence of reducing sugars. It contains copper(II) sulfate, which acts as an oxidizing agent. During the test, the reducing sugars reduce the copper(II) ions to copper(I) oxide, which precipitates out of solution. Thus, Benedict's Reagent indeed functions as an oxidizing agent in this context.
3. Tollen's Reagent:
- Tollen's Reagent is used primarily to test for the presence of aldehydes. It contains silver nitrate in ammonia, and when it reacts with an aldehyde, the aldehyde is oxidized to a carboxylic acid. In this process, the reagent itself is reduced, depositing metallic silver. Therefore, Tollen's Reagent serves as an oxidizing agent.
Since all three chemicals are used in laboratory settings for their oxidizing properties, the statement is:
True
