Please select a subject first
Advertisements
Advertisements
What is meant by refining of a metal? Name the most widely used method for the refining of impure metals obtained by various reduction processes. Describe this method with the help of a labelled diagram by taking the example of any metal.
Concept: undefined >> undefined
How are metals refined by the electrolytic process?
Concept: undefined >> undefined
Advertisements
Name any five metals which are purified by electrolytic refining method.
Concept: undefined >> undefined
During the refining of an impure metal by electrolysis, the pure metal is a deposited ______.
Concept: undefined >> undefined
Explain how the following metals are obtained from their compounds by the reduction process:
(i) Metal M which is in the middle of the reactivity series.
(ii) Metal N which is high up in the reactivity series.
Give one example of each type
Concept: undefined >> undefined
The lightest liquid metal is ____________.
Concept: undefined >> undefined
\[\ce{Cu2S + 3Cu2O -> 6Cu + SO2}\]
The above process is:
Concept: undefined >> undefined
Bauxite is mixed with cryolite so as to
(i) reduce its melting point
(ii) increase its electrical conductivity
(iii) molten cryolite acts as a solvent
(iv) increase its melting point
Concept: undefined >> undefined
In the electrolytic refining of copper, the electrolyte used is:
Concept: undefined >> undefined
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
(i) Au
(ii) Cu
(iii) Na
(iv) K
Concept: undefined >> undefined
An electrolytic cell consists of
- positively charged cathode
- negatively charged anode
- positively charged anode
- negatively charged cathode
Concept: undefined >> undefined
During electrolytic refining of zinc, it gets
Concept: undefined >> undefined
Reaction between X and Y, forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z?
Concept: undefined >> undefined
Which one of the following figures correctly describes the process of electrolytic refining?
Concept: undefined >> undefined
What are the constituents of solder alloy? Which property of solder makes it suitable for welding electrical wires?
Concept: undefined >> undefined
Give the formulae of the stable binary compounds that would be formed by the combination of following pairs of elements.
- Mg and N2
- Li and O2
- Al and Cl2
- K and O2
Concept: undefined >> undefined
A reddish-brown metal ‘X’, when heated in air, gives a black compound ‘Y’, which when heated in the presence of H2 gas gives ‘X’ back. ‘X’ is refined by the process of electrolysis; this refined form of ‘X’ is used in electrical wiring. Identify ‘X’ and ‘Y’. Draw a well-labelled diagram to represent the process of refining ‘X’.
Concept: undefined >> undefined
Write two methods of preventing the rusting of iron.
Concept: undefined >> undefined
Why do we apply paint on iron articles?
Concept: undefined >> undefined
Explain the term corrosion.
Concept: undefined >> undefined
