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Among the following, which one is the strongest base? Give reasons
1. [tex]NH _{3} [/tex]
2. [tex]PH _{3} [/tex]
3. [tex]AsH _{3} [/tex]
4. [tex]SbH _{3} [/tex]

Answer :

The basicity of hydrides increases from bottom to top in a period. Due to increase in size from top to bottom, electron density around the nucleus decreases. This leads to a decrease in basicity from top to bottom.
So NH₃ is the strongest base

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