In a borax bead test under hot condition,a me | vedclass

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Question

(B) In the borax bead test,point $A$ represents the oxidizing flame (outer part) and point $B$ represents the reducing flame (inner part). Copper salt

Vedclass · Accepted Answer

$6$

Vedclass · Answer

(B) In the borax bead test,point $A$ represents the oxidizing flame (outer part) and point $B$ represents the reducing flame (inner part). Copper salts $(Cu^{2+})$ produce a green-coloured bead in the oxidizing flame (hot) and a red-coloured bead in the reducing flame. However,iron salts $(Fe^{3+})$ produce a yellow-brown bead in the oxidizing flame and a bottle-green bead in the reducing flame (point $B$). For $Fe^{3+}$ $([Ar] 3d^5)$,the number of unpaired electrons $(n)$ is $5$. The spin-only magnetic moment is calculated as $\mu = \sqrt{n(n+2)} = \sqrt{5(5+2)} = \sqrt{35} \approx 5.92 \ BM$. The nearest integer value is $6$.

Column $A$	Column $B$
$(1)$ Brass	$(a)$ $Ni$ $(60\%)$,$Cr$ $(40\%)$
$(2)$ Bronze	$(b)$ $Cu$ $(80\%)$,$Sn$ $(20\%)$
$(3)$ Cupronickel	$(c)$ $Cu$ $(90\%)$,$Sn$ $(10\%)$
$(4)$ Nichrome	$(d)$ $Cu$ $(70\%)$,$Zn$ $(30\%)$
	$(e)$ $Cu$ $(75-85\%)$,$Ni$ $(15-25\%)$

In a borax bead test under hot condition,a metal salt is heated at point $B$ of the flame,resulting in a green-coloured salt bead. The spin-only magnetic moment value of the salt is $..........$ $BM$ (Nearest integer). [Given atomic number of $Cu=29, Ni=28, Mn=25, Fe=26$]

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Which of the following ions is green in colour?

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Match Column $A$ with Column $B$:

Column $A$ Column $B$

$(1)$ Brass $(a)$ $Ni$ $(60\%)$,$Cr$ $(40\%)$

$(2)$ Bronze $(b)$ $Cu$ $(80\%)$,$Sn$ $(20\%)$

$(3)$ Cupronickel $(c)$ $Cu$ $(90\%)$,$Sn$ $(10\%)$

$(4)$ Nichrome $(d)$ $Cu$ $(70\%)$,$Zn$ $(30\%)$

$(e)$ $Cu$ $(75-85\%)$,$Ni$ $(15-25\%)$

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