Statement-1 : Colourless cupric metaborate is converted into cuprous metaborate in a luminous flame.
Statement-2: Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.

In the light of the above statements, choose the most appropriate answer from the options given below.

Statement-1 is true and Statement-2 is false

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Statement-1 is false and Statement-2 is true

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Both are false

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Both are true

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Solution

The correct option is C Both are false
Answer : (c)
Cupric metaborate $(C u {(B O_{2})}_{2}$ is blue - green in color and is not colorless, but it does convert into cuprous metaborate in a luminous flame (reducing flame)
$2 C u (B O_{2})_{2} + C \to 2 C u B O_{2} + B_{2} O_{3} + C O ↑$

Thus, Statement-1 is incorrect.

Cuprous metaborate is formed by reacting copper sulphate with boric anhydride in a luminous flame.

$C u S O_{4} + B_{2} O_{3} \to C u {(B O_{2})}_{2} + S O_{3} ↑$

Hence, Statement-2 is also incorrect.

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