Correct match is : - Vidyadip

MCQ

Correct match is :

A
Ordinary form of borax $:$ $Na_2B_4O_7 · 5H_2O$
✓
Colemanite $:$ $Ca_2B_6O_{11}·5H_2O$
C
Boronatrocalcite $:$ $2Mg_3B_8O_{15}·MgCl_2$
D
Octahedral form of borac $:$ $Na_2B_4O_7·10H_2O$

✓

Answer

Correct option: B.

Colemanite $:$ $Ca_2B_6O_{11}·5H_2O$

b
(A) Incorrect. Ordinary form of Borax $= Na _2 B _4 O _7 \cdot 10 H _2 O$

(B) Correct: Colemanite $= Ca _2 B _6 O _{11} \cdot 5 H _2 O$

(c) Incorrect: Bernarocalcite $= CaB _4 O _7 \cdot NaBO _2 \cdot 8 H _2 O$

(D) Correct: Octahedral form of borax $= Na _2\left[ B _4 O _5( OH )_4\right] \cdot 8 H _2 O$

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