List of top Chemistry Questions on Occurrence Of Metals asked in ICSE Class X board

Study the reaction scheme shown below and identify the reactants A, B and C. 

 

Using suitable chemicals from the box, write balanced chemical equations for the preparation of the following salts: Lead (II) carbonate, Copper (II) chloride, Iron (II) chloride.

Study the reaction given below and answer the questions that follow:
NaNO₃ + H₂SO₄ → NaHSO₄ + HNO₃ (below 200°C)
(a) Give one reason for maintaining the temperature below 200°C.
(b) Why is concentrated Sulphuric acid used in the above reaction?
 

Alex was given a solution of an unknown salt Y for analysis. He performed the following tests and recorded his observations:
• To a part of the solution Y, he added silver nitrate solution and obtained a white precipitate which was soluble in ammonium hydroxide solution.
• To the remaining solution he added a few drops of sodium hydroxide solution and obtained a pale blue precipitate.
Based on the observations made by Alex, identify:
(a) the anion and
(b) the cation present in salt Y.

Given below is the industrial process for the manufacture of ammonia gas. Study the schematic diagram to answer the following questions. 
(a) Name the process. 
(b) Which catalyst is used in the above process? 
(c) In the above diagrammatic setup, how is ammonia gas separated from the unreacted gases to obtain liquid ammonia? 
(d) Which two properties of ammonia gas can be demonstrated by the Fountain Experiment? 


 

The method which cannot be used for the preparation of copper salts is: