AIIMS Chemistry Principles Related To Practical Chemistry Class 12 Questions

Which give colored carbonate precipitate?

The pH of the salt is, pH = 1/2 (pKₐ + pK_b + pK_w) = 1/2 (14 + 4 - 5) = 6.5

Point out the true statement.

When calomel is treated with ammonium hydroxide, a black substance is formed. The black substance is

Which will not form precipitation after addition of (NH₄)₂CO₃ in presence of NH₄Cl?

The compound which does not exist as hydrate form

Which of the following is not hygroscopic?

Butter is an example of which type of colloid?

Assertion: Millon’s test is a test for identification of proteins. Reason: Millon’s reagent is a solution of mercurous nitrate and mercuric nitrate in nitric acid containing little nitrous acid.

Cyanogen gas is obtained in the reaction

During titration of acetic acid with aq. NaOH solution, the neutralisation graph has a pH vertical line. This line indicates

Assertion : In the iodometric titration starch is used as an indicator. Reason : Starch is a polysaccharide.

Assertion : Addition of NH₄OH to an aqueous solution of BaCl₂ in the presence of NH₄Cl (excess) precipitates Ba(OH)₂. Reason : Ba(OH)₂ is insoluble in water.

Dimethyl glyoxime gives a red precipitate with Ni²⁺, which is used for its detection. To get this precipitate readily the best pH range is

Which of the following imparts green colour to the burner flame?

Assertion : Sb (III) is not precipitated as sulphide when in its alkaline solution H₂S is passed. Reason : The concentration of S²⁻ ion in alkaline medium is inadequate for precipitation.

The mixture of concentrated HCl and HNO₃ made in 3 : 1 ratio contains

The compound used for gravimetric estimation of copper(II) is