Chemistry
A strip of copper is placed in four different colourless salt solutions. They are KNO3, AgNO3, Zn(NO3)2, Ca(NO3)2. Which one of the solutions will finally turn blue.
Related Questions
In the extraction of aluminium :
(i) Which soln. is used to react with bauxite as a first step in obtaining pure aluminium oxide.
(ii) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. Write the equation for this reaction.
(iii) Name the element which serves as the anode and cathode in the extraction of aluminium.
(iv) Write equation for the reaction at the cathode during the extraction of aluminium by electrolysis.
(v) Give the equation for the reaction at the anode when aluminium is purified by electrolysis.
Calcium, Copper, Lead, Aluminium, Zinc, Chromium, Magnesium, Iron. Choose the major metals from the list given above to make the following alloys :
(i) Stainless steel
(ii) Brass.
When a metal atom becomes an ion : [Choose the correct answer from the choices A, B, C and D]
A : it loses electrons and is oxidized
B : it gains electrons and is reduced
C : it gains electrons and is oxidized
D : it loses electrons and is reducedName the following :
(i) A metal which is liquid at room temperature.
(ii) A compound added to lower the fusion temp. of the electrolytic bath in the extraction of Al.
(iii) The process of heating an ore to a high temperature in the presence of air.