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Hydrogen · Question 8

NEET 2018MCQMedium📈 Topic in 12% papers+4−1
1

Among CaH2, BeH2, BaH2, the order of ionic character is

  1. BeH2 < CaH2 < BaH2
  2. CaH2 < BeH2 < BaH2
  3. BeH2 < BaH2 < CaH2
  4. BaH2 < BeH2 < CaH2

Answer

(1) BeH2 < CaH2 < BaH2

Solution

On moving down group 2 (Be → Ca → Ba), the size of the metal ion increases and its electronegativity decreases.

⇒ Polarising power of the cation decreases, so the covalent character of the hydride decreases and ionic character increases.

As per NCERT, BeH2 (and MgH2) are covalent and polymeric, whereas the heavier members form ionic (saline) hydrides.

∴ BeH2 < CaH2 < BaH2

Answer: (1)

Out of syllabusNEET 2018

Keep practising — Hydrogen

2

Which of the following statements about hydrogen is incorrect?

  1. Hydronium ion, H3O+ exists freely in solution.
  2. Dihydrogen does not act as a reducing agent.
  3. Hydrogen has three isotopes of which tritium is the most common.
  4. Hydrogen never acts as cation in ionic salts.
Out of syllabusNEET 2016 (Phase 1)
3

(I) H2O2 + O3 H2O + 2O2 (II) H2O2 + Ag2O 2Ag + H2O + O2 Role of hydrogen peroxide in the above reactions is respectively

  1. oxidizing in (I) and reducing in (II)
  2. reducing in (I) and oxidizing in (II)
  3. reducing in (I) and (II)
  4. oxidizing in (I) and (II)
AIPMT 2014
4

Some statements about heavy water are given below: Which of the above statements are correct?

  1. (i) and (ii)
  2. (i), (ii) and (iii)
  3. (ii) and (iii)
  4. (i) and (iii)
Out of syllabusAIPMT 2010 (Mains)
5

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

  1. NH3
  2. H2O
  3. B2H6
  4. CH4
AIPMT 2010 (Prelims)
6

The structure of H2O2 is

  1. spherical
  2. non-planar
  3. planar
  4. linear
Out of syllabusAIPMT 2003
7

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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