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Borax

In borax-bead...

Question

In borax-bead test, there is formation of transparent bead of:

{N a P O}_{3}

and

N a {B O}_{2}

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N a {B O}_{2}

and

{N a}_{2} B_{4} O_{7}

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N a {B O}_{2}

and

B_{2} O_{3}

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N a {P O}_{3}

and

B_{2} O_{3}

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Solution

The correct option is C $N a {B O}_{2}$ and $B_{2} O_{3}$
Borax on heating loses water molecules and swells up and this on further heating turns into a transparent liquid which is a transparent bead called borax bead.
$N a_{2} B_{4} O_{7} .10 H_{2} O Δ - \to N a_{2} B_{4} O_{7} Δ - \to 2 N a B O_{2} + B_{2} O_{3}$
Sodium metaborate Boric anhydride

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Similar questions

(N a {B O}_{2} + B_{2} O_{3})

(A) + g a s B - --- \to (C) δ \to (A) + (D)

(C) c o n c . H_{2} S O_{4} - ------ \to (E)

(D) +

Δ - \to (F)

(E) + C_{2} H_{5} O H Δ - \to

(G)

{N a B O}_{2}

{C O}_{2}

{N a}_{2} B_{4} O_{7}

B_{2} O_{3}

H_{3} {B O}_{3}

{C o ({B O}_{2})}_{2}

(C_{2} H_{5} O)_{3} B

{C r}_{2} O_{3}

N a_{2} B_{4} O_{7} .10 H_{2} O H e a t - -- \to X + N a B O_{2} + H_{2} O

X + C r_{2} O_{3} H e a t - -- \to Y G r e e n c o l o u r

X

Y

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