6th March, 2023 Science and Technology
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- Researchers at the Paderborn University, Germany have reported being able to make a unique class of catalysts – used in chemistry to accelerate reactions – called “Lewis super-acids”.
About “Lewis super-acids”
- Named for the chemist, G N Lewis, Lewis super-acids derive from Lewis acids.
- A Lewis acid is any substance, such as a Hydrogen ion (H+) that can accept a pair of nonbonding electrons.
- In other words, a Lewis acid is an electron-pair acceptor. A Lewis base is any substance, such as the OH- ion, that can donate a pair of nonbonding electrons. A Lewis base is therefore an electron-pair donor.
- Because Lewis acids add electron pairs, they are often used to speed up chemical reactions.
- Lewis superacids are stronger than antimony pentafluoride -- the strongest Lewis acid -- and can break even the toughest bonds. Breaking strong, chemical bonds requires highly reactive substances.
- Because they are so reactive, they are hard to manufacture.
- Being able to make these super acids, enables non-biodegradable fluorinated hydrocarbons, similar to Teflon, and possibly even climate-damaging greenhouse gases, such as sulphur hexafluoride, to be converted back into sustainable chemicals.
Q) Which of the following statements is/are correct?
a. A Lewis acid is any substance, such as a Hydrogen ion (H+) that can accept a pair of nonbonding electrons.
b. Because Lewis acids add electron pairs, they are often used to speed up chemical reactions.
I. Only a
II. Only b
III. Both a and b
IV. Neither a nor b
Answer: Option III