Question bank/JEE Main/Chemistry
JEE MainChemistryModeratePhysical Chemistry
4 g of copper was dissolved in concentrated nitric acid. The
copper nitrate solution on strong heating gave 5 g of its oxide. The
equivalent weight of copper is
Show answer and solution
present.
--------------------------------------------
Element Wt. At Wt. Wt./At Wt. Ratio
---------- ---- ----- ------------ ------------
Cu 4 gm 63.5 4/63.5 = 0.625 [IMAGE] O 1 gm 16 1-16 = 0.0625 [IMAGE] --------------------------------------------
Empirical formula = [IMAGE] of oxide
In this oxide, oxidation no. of Cu = +2
[IMAGE] but Equivalent weight should be an integral no.
= 32
--------------------------------------------
Element Wt. At Wt. Wt./At Wt. Ratio
---------- ---- ----- ------------ ------------
Cu 4 gm 63.5 4/63.5 = 0.625 [IMAGE] O 1 gm 16 1-16 = 0.0625 [IMAGE] --------------------------------------------
Empirical formula = [IMAGE] of oxide
In this oxide, oxidation no. of Cu = +2
[IMAGE] but Equivalent weight should be an integral no.
= 32
Source: Grass-G / CH-14 Chemistry Paper 7 Nov..docx
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