Question:

The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is

Updated On: Jul 10, 2024
  • $Ag$
  • $Ca$
  • $Cu$
  • $Cr$
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The Correct Option is B

Solution and Explanation

On electrolysis only in case of $Ca ^{2+}$ salt aqueous solution $H _{2}$ gas discharge at Cathode. Case of $Cr$ At cathode : $Cr ^{3+}+2 e ^{-} \longrightarrow Cr$ So, $Cr$ is deposited. Case of $Ag$ At cathode : $Ag ^{+}+ e ^{-} \longrightarrow Ag$ So, $Ag$ is deposited. Case of $Cu$ At cathode : $Cu ^{2+}+2 e ^{-} \longrightarrow Cu$ Case of $Ca ^{2+}$ At cathode $: H _{2} O + e ^{-} \longrightarrow \frac{1}{2} H _{2}+ OH ^{-}$
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Concepts Used:

Group 2 Elements

The group two or alkaline earth metals are s-block elements with two electrons in their s-orbital. They are alkaline earth metals. They are named so because of the alkaline nature of the hydroxides and oxides.

Alkaline earth metals are characterized by two s-electrons. This group of elements includes:

  • Beryllium (Be)
  • Magnesium (Mg)
  • Calcium (Ca)
  • Strontium (Sr)
  • Barium (Ba)
  • Radium (Ra)

Elements whose atoms have their s-subshell filled with their two valence electrons are called alkaline earth metals. Their general electronic configuration is [Noble gas] ns2. They occupy the second column of the periodic table and so-called as group two metals also.