Q. 43.7( 9 Votes )
By which method metals of high reactivity are purified?
Electrolytic reduction is a method by which metals of high reactivity are purified.
Explanation: The metals which are at the top of the reactivity series are very reactive.
The reactive metals cannot be obtained by simply heating with carbon. Because carbon being less reactive is not able to reduce the metals. Hence, these metals are obtained by electrolytic reduction.
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i. What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?
ii. What type of reaction is this?
iii. Write a balanced chemical equation to represent the above reaction.
A brown substance ‘X’ on heating in air forms a substance ‘Y’. When hydrogen gas is passed over heated ‘Y’, it again changes back into ‘X’.
i. Name the substance ‘X’ and ‘Y’
ii. Name the type of chemical reactions occurring during both the changes.
iii. Write the chemical equations of the reactions.Xam idea - Science