Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Which of the following is obtained when dilute HCl is added to a beaker that contains copper oxide?
The blue-green colour of copper (II) chloride
The red colour of copper (II) chloride
The blue-green colour of copper (III) chloride
The colourless solution of copper (II) chloride
The blue-green colour of copper (II) chloride
When copper(II) oxide (CuO), a black solid, reacts with dilute hydrochloric acid (HCl), it undergoes a neutralization reaction to form copper(II) chloride (CuCl2тАЛ) and water. The resulting solution turns a characteristic blue-green color due to the presence of hydrated copper(II) ions in the aqueous medium.
When copper(II) oxide (CuO), a black solid, reacts with dilute hydrochloric acid (HCl), it undergoes a neutralization reaction to form copper(II) chloride (CuCl2тАЛ) and water. The resulting solution turns a characteristic blue-green color due to the presence of hydrated copper(II) ions in the aqueous medium.
Think of it like adding sugar to black coffee; the black solid copper oxide 'dissolves' into the acid to create a new, distinctively colored blue-green 'drink' (solution).
CuO+2HClтЖТCuCl2тАЛ+H2тАЛO тАФ The chemical equation for the reaction of copper(II) oxide with dilute hydrochloric acid.
This is a metal oxide reacting with an acid. Metal oxides are basic in nature, so they react with acids to form salt and water, a type of neutralization reaction. The balanced chemical equation is CuO(s)+2HCl(aq)тЖТCuCl2тАЛ(aq)+H2тАЛO(l).
Copper(II) oxide is a black, insoluble powder.
Copper(II) chloride is a soluble salt that gives an aqueous solution a blue-green color.
The reaction is classified as a double displacement or neutralisation reaction.
Used to produce copper salts in laboratory settings.
Used in the demonstration of metal oxide basicity.
Copper(II) chloride in solid form appears as a yellowish-brown powder, but in aqueous solution, it forms a blue-green liquid.
Option B is incorrect as copper chloride is not naturally red.
Option C is incorrect because copper(III) chloride is not the stable product of this reaction.
Option D is incorrect as the resulting solution is definitely colored, not colourless.
A is correct тАФ The reaction produces copper(II) chloride, which forms a characteristic blue-green solution.
Remember that copper salts, specifically Cu2+ ions, typically exhibit blue or blue-green colors in aqueous solutions; this is a frequently tested fact in competitive exams.
Get instant step-by-step AI explanations, full shift Previous Year Papers (SSC GD, RRB, SSC JE), and regional rank analysis on the official Examoogle App.
Free Download тАв 100K+ Aspirants