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BITSAT 2015
Exam
BITSAT
Year
2015
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

BITSAT 2015 · Chemistry · Classification of Elements and Periodicity in Properties

Which of the following is a strong base?

Which of the following is a strong base?

Options

  1. APH3\mathrm{PH}_{3}
  2. BAsH3\mathrm{AsH}_{3}
  3. CNH3\mathrm{NH}_{3}
  4. DSbH3\mathrm{SbH}_{3}

Correct answer

C. NH3\mathrm{NH}_{3}

Step-by-step solution

Order of basic character is NH3>PH3>AsH3>SbH3.\mathrm{NH}_{3} > \mathrm{PH}_{3} > \mathrm{AsH}_{3} > \mathrm{SbH}_{3}. Basic-character decreases down the group from N\mathrm{N} to Bi due to increase in atomic size.
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