MCQ
Boric acid is an acid because its molecule 
  • A
    contains replaceable $H^+$ ion
  • B
    gives up a proton
  • accepts $OH^-$ from water releasing proton.
  • D
    combines with proton from water molecule.

Answer

Correct option: C.
accepts $OH^-$ from water releasing proton.
c
Boric acid is an acid because its molecule accepts $\mathrm{OH}^{-}$ from water releasing proton

$\mathrm{B}(\mathrm{OH})_{3}+\mathrm{H}_{2} \mathrm{O} \longrightarrow\left[\mathrm{B}(\mathrm{OH})_{4}\right]^{(-)}(\mathrm{aq})+\mathrm{H}^{(-)}(\mathrm{aq})$

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Based on the following thermochemical equations

${H_2}O\left( g \right) + C\left( s \right) \to CO\left( g \right) + {H_2}\left( g \right);\Delta H = 131\,kJ$

$CO\left( g \right) + \frac{1}{2}{O_2}\left( s \right) \to C{O_2}\left( g \right);\Delta H =  - 282\,kJ$

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$C(s) + O_2(g) \to CO_2(g); \Delta H = X\,kJ$

The value of $X$ will be......$kJ$