Checkout JEE MAINS 2022 Question Paper Analysis : Checkout JEE MAINS 2022 Question Paper Analysis :

S-1: Colourless cupric metaborate is converted into cuprous metaborate in a luminous flame.

a. S-1 is true and S-2 is false

b. S-1 is false and S-2 is true

c. Both are false

d. Both are true

Answer: (c)

Cupric metaborate (Cu(BO2)2 is blue-green in color and is not colorless, but it does convert into cuprous metaborate in a luminous flame(reducing flame)

2Cu(BO2)2 + C → 2CuBO2 + B2O3 + CO↑

Thus, S-1 is incorrect.

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

CuSO4 + B2O3 → Cu(BO2)2 + SO3

Hence, S-2 is also incorrect.

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