Chemistry
Look at the figure given alongside and answer the following questions ;
(a) Explain why is a freshly prepared saturated solution of FeSO4 preferred in the above diagram.
(b) Why is the ring formed at the junction of two liquids ?
Answer
(a) A freshly prepared ferrous sulphate solution is used, because on exposure to the atmosphere, it is oxidised to ferric sulphate, which will not give the brown ring test.
(b) The brown ring of nitroso ferrous sulphate is formed at the junction of the two liquids because the conc. sulphuric acid being heavier settles down and the ferrous sulphate layer remains above it resulting in the formation of a brown ring at the junction.
Related Questions
Select the correct property of sulphuric acid given in column A which relates to the respective conversions given in column B.
Column A Column (A) Dehydrating nature 1. Na2SO3 + H2SO4 ⟶ Na2SO4 + H2O + SO2 (B) Non- volatile acid 2. S + 2H2SO4 ⟶ 3SO2 + 2H2O (C) Acidic nature 3. CH3CH2OH + H2SO4 (Conc.) ⟶ H2C = CH2 (D) Oxidising agent Give balanced chemical equation for the following conversions :
(a) Copper sulphate to inky blue solution
(b) Methane to chloroform
Give the structural formula of:
(a) Acetic acid
(b) Acetaldehyde
(c) 1, 2 dichloroethane
State your observations when:
(a) Ethylene gas is passed through bromine water
(b) Silver nitrate solution is added to hydrochloric acid.
(c) Barium chloride is added to potassium sulphate solution.