Upon adding hydrochloric acid in copper oxide, it turns to blue-green color which is due to the formation of
Copper (II) chloride
Copper oxide (CuO) reacts with hydrochloric acid (HCl) to form copper(II) chloride and water: CuO + 2HCl → CuCl2 + H2O. The Cu2+ ion gives the solution its characteristic blue-green color, whereas copper(I) compounds are typically white or insoluble and would not produce this color.
Which one of the following is the correct order of reactivity of Mg, Al, Zn and Fe with HCI?
Which one of the following isnotan example of an oxidation reaction?
Which one of the following does NOT form oxide on reaction with oxygen?
Which one of the following is not true for anodizing process?
In the joining of railway tracks, iron oxide is made to react with
When copper reacts with moist carbon dioxide (CO 2) in air, it forms a green coating of which one of the following compounds?
What is the name of the process that converts sulphide ores into oxides by heating strongly in the presence of excess air ?
Calcium oxide reacts vigorously with water to produce slaked lime whose solution is used for white-washing walls. This slaked lime reacts with component (A) in air to form a thin layer of component (B) to give a shiny finish. What are the components (A) and (B) ?
Lead nitrate on heating gives
Which one of the following equations is the balanced chemical equation for the given reaction?
Fe + H2O → Fe3O4 + H2
Which of the following statement is/are true?
I. In physical change new substance is formed. substance is formed.
II. In chemical change no new substance is formed.
Which of the following cells involves similar chemical reactions?
The information not obtained from balanced chemical equation is
Oxygen cannot be obtained by which one of the following methods?
Which is the most reactive metal?