According to the Bronsted Lowery definition, a base is a a substance that increases the hydroxide ion concentration in water b a substance that can accept a proton from an acid c a substance that can donated an electron pair to the formation of a covalent bond. d a substance tha increases the anion formed by the autoionization of the solven t e none of these

B. a substance that can accept a proton from an acid

Explanation:

Johannes Brønsted and Martin Lowry independently developed definitions of acids and bases based on compounds abilities to either donate or accept protons (H+ ions).

The acid is the donor of the hydrogen ions while the bass is the acceptor of the hydrogen ions.

Back to the options, the correct option is B. Which is a substance that can accept a proton from an acid. All other options are incorrect.

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c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.