Principles Related to Practical Chemistry
Detection of extra elements (N, S, halogens) in organic compounds; detection of functional groups — hydroxyl (alcoholic, phenolic), carbonyl (aldehyde and ketone), carboxyl, amino; chemistry involved in titrimetric exercises — acid-base titrations using oxalic acid, potassium permanganate, ferrous sulphate; chemistry of qualitative analysis of cations and anions.
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Take a full mock →Q1 · Principles Related to Practical Chemistry · EASY
In Lassaigne's test for detection of nitrogen in an organic compound, the sodium extract is boiled with ferrous sulphate and then acidified with concentrated sulphuric acid. A Prussian blue precipitate is formed. The chemical formula of this precipitate is:
Q2 · Principles Related to Practical Chemistry · MEDIUM
In the systematic qualitative analysis of a salt, a student performs a brown ring test for nitrate ion. The chemical reaction responsible for the formation of the brown ring at the junction of two layers is:
Q3 · Principles Related to Practical Chemistry · MEDIUM
During a redox titration, 20 mL of 0.1 M oxalic acid solution is titrated against potassium permanganate solution in acidic medium. If 16 mL of KMnO4 solution is required to reach the endpoint, the molarity of KMnO4 solution is:
Q4 · Principles Related to Practical Chemistry · EASY
A student wants to distinguish between acetaldehyde and acetone. Which of the following reagents would give a positive test only with acetaldehyde?
Q5 · Principles Related to Practical Chemistry · HARD
In the qualitative analysis of a mixture of cations, group II cations (Pb2+, Cu2+, Cd2+) are precipitated by passing H2S gas in the presence of dilute HCl. The primary reason for adding dilute HCl before passing H2S is: