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Reactivity With Air CO2 and Water (Group 1)

Sodium borate...

Question

Sodium borate on reaction with conc. $H_{2} {S O}_{4}$ and $C_{2} H_{5} O H$ gives a compound $A$ , which burns with a green edged flame. The compound $A$ is:

H_{2} B_{4} O_{7}

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{{(C}_{2} H_{5})}_{2} B_{4} O_{7}

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

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

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Solution

The correct option is D ${{(C}_{2} H_{5} O)}_{3} B$
When borate is heated with ethanol and conc. $H_{2} S O_{4}$ , triethyl borate is produced and these vapours will burn with a green edged flame on ignition.

$2 N a_{3} B O_{3} + 3 H_{2} S O_{4} (c o n c .) \to 3 N a_{2} S O_{4} (a q) + 2 H_{3} B O_{3}$

$H_{3} B O_{3} + 3 C_{2} H_{5} O H \to B O_{3} (C_{2} H_{5})_{3} + 3 H_{2} O$

Triethyl Borate

Thus, the green edged flame is due to Triethyl Borate.

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Similar questions

H_{2} {S O}_{4}

(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

[X] + H_{2} {S O}_{4} ⟶ [Y]

[Y] + K_{2} {C r}_{2} O_{7} + H_{2} {S O}_{4} ⟶

H_{3} {P O}_{4}, H_{2} {S O}_{4}, H_{3} {P O}_{3}, H_{2} {C O}_{3}, H_{2} S_{2} O_{7}, H_{3} B O_{3}, H_{3} {P O}_{2}, H_{2} {C r O}_{4}, H_{2} {S O}_{3}

A

C_{2} H_{6} O

B

A

B

H_{2} {S O}_{4}

C

A, B, C

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