AP EAMCET201923 Apr 2019Morning ShiftChemistryp Block Elements (Group 13 & 14)Actual
Identify correct statements from the following: i. ( H ₃ BO ₃ ) is a monobasic acid. ii. The correct formula of borax is ( Na ₂ [ ~B ₄ O ₅( OH )₃ ] 8 H ₂ O ). iii. ( NaBH ₄ ) is a reducing agent.
Options
- Ai, ii, iii
- Bi, ii only
- Cii, iii only
- Di, iii only
Correct answer
D. i, iii only
Step-by-step solution
The explanations of given statements are as follows : (i) ( H ₃ BO ₃ ) is a monobasic acid because in aqueous solution, it coordinates with a molecule of water to form a hydrated species, ( B ³⁺ ) ion pulls the ( )-electron charge of coordinated ( O )-atom towards itself. The coordinated oxygen, in turn, pull the ( )-electrons of ( O - H ) bond of the attached water molecule towards itself. This facilitates the removal of ( H ⁺ )ion from the ( O - H ) bond. It can be written as follows: ( B ( OH )₃+ H ₂ O [ B ( OH