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Hydrogen · Question 12

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 12% papers+4−1
1

Which one of the following molecular hydrides acts as a Lewis acid?

  1. NH3
  2. H2O
  3. B2H6
  4. CH4

Answer

(3) B2H6

Solution

As per NCERT, molecular hydrides are classified as electron-deficient, electron-precise and electron-rich hydrides.

B2H6 is electron-deficient (too few electrons for normal covalent bonds) acts as a Lewis acid (electron acceptor).

CH4 is electron-precise (neither acid nor base); NH3 and H2O are electron-rich (lone pairs) Lewis bases.

Answer: (3)

AIPMT 2010 (Prelims)

Keep practising — Hydrogen

2

The structure of H2O2 is

  1. spherical
  2. non-planar
  3. planar
  4. linear
Out of syllabusAIPMT 2003
3

The life span of atomic hydrogen is

  1. fraction of one second
  2. one year
  3. one hour
  4. one day
Out of syllabusAIPMT 2000

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