Which of the following substances will not gi | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The borax bead test is used to identify colored transition metal ions. $Borax$ $(Na_2B_4O_7 \cdot 10H_2O)$ on heating forms a transparent glassy b

Vedclass · Accepted Answer

Sodium

Vedclass · Answer

(C) The borax bead test is used to identify colored transition metal ions. $Borax$ $(Na_2B_4O_7 \cdot 10H_2O)$ on heating forms a transparent glassy bead consisting of $NaBO_2$ and $B_2O_3$. Transition metal oxides react with this bead to form colored metaborates. Since $Sodium$ $(Na)$ is an alkali metal and does not form colored metaborates,it does not give the borax bead test. $Chromium$,$Ferrous$ salts,and $Cobalt$ are transition metals/ions that form characteristic colored beads.

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	$(d)$ $Cu$ $(70\%)$,$Zn$ $(30\%)$
	$(e)$ $Cu$ $(75-85\%)$,$Ni$ $(15-25\%)$

Which of the following substances will not give the borax bead test?

Similar Questions

On heating $Mn(OH)_2$ with $PbO_2$ and conc. $HNO_3$,a pink colour is obtained due to the formation of:

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

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

Which of the following does not give oxygen on heating?

$Cr_2O_7^{2-} / H^{\oplus}$ $\xrightarrow[200^{\circ}C]{H_2O_2} 'X'$ $\xrightarrow{\text{On Standing}} 'Y'_{(aq. sol)}$
Select the correct option for $'X'$ and $'Y'$

The manganate and permanganate ions are tetrahedral,due to

Vedclass Test Series

Exam Paper Generator

Online Exam Module