Copper becomes green when exposed to moist air for a long period. This is due to
- Athe formation of a layer of cupric oxide on the surface of copper.
- Bthe formation of a layer of basic carbonate of copper on the surface of copper.
- Cthe formation of a layer of cupric hydroxide on the surface of copper.
- Dthe formation of basic copper sulphate layer on the surface of the metal.
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Similar Questions
Which of the following electronic configurations belongs to $s-$block elements?
Easy
View SolutionWhich of the following orders are correct against the stated property?
$I$) $NaO_2 < KO_2 < RbO_2 < CsO_2$ - stability
$II$) $Mg(OH)_2 < Ca(OH)_2 < Sr(OH)_2$ - basic strength
$III$) $MgCO_3 < CaCO_3 < SrCO_3$ - thermal stability
$I$) $NaO_2 < KO_2 < RbO_2 < CsO_2$ - stability
$II$) $Mg(OH)_2 < Ca(OH)_2 < Sr(OH)_2$ - basic strength
$III$) $MgCO_3 < CaCO_3 < SrCO_3$ - thermal stability
To distinguish between $A$ and $B$,it is observed that both elements form oxides,but $B$ also forms a nitride when burnt in air. What are $A$ and $B$?
Easy
View SolutionThe pair$(s)$ of reagents that yield paramagnetic species is/are:
$A$. $Na$ and excess of $NH_3$
$B$. $K$ and excess of $O_2$
$C$. $Cu$ and dilute $HNO_3$
$D$. $O_2$ and $2-ethylanthraquinol$
$A$. $Na$ and excess of $NH_3$
$B$. $K$ and excess of $O_2$
$C$. $Cu$ and dilute $HNO_3$
$D$. $O_2$ and $2-ethylanthraquinol$
Write a note on $s$-block elements of the periodic table.
Medium
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