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Hydrogen · Question 4

NEET (UG) 2022 (Phase 2)MCQEasy📈 Topic in 38% papers+4−1
1

The element used for welding metals with high melting points is

  1. He
  2. Cl2
  3. H2
  4. Ne

Answer

(3) H2

Solution

Dihydrogen is dissociated in an electric arc into atomic hydrogen; the atoms recombine on the metal surface:

2H H2; H = -436 kJ mol-1

This produces a temperature of about 4000 K.

As per NCERT, atomic hydrogen and oxy-hydrogen torches using H2 are used for cutting and welding metals with high melting points.

Answer: (3)

Out of syllabusNEET (UG) 2022 (Phase 2)

Keep practising — Hydrogen

2

Tritium, a radioactive isotope of hydrogen, emits which of the following particles?

  1. Neutron (n)
  2. Beta ( -)
  3. Alpha ( )
  4. Gamma ( )
Out of syllabusNEET (UG) 2021
3

Match the following and identify the correct option.

  1. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
  2. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
  3. (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
  4. (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
NEET (UG) 2020
4

The method used to remove temporary hardness of water is :

  1. Ion-exchange method
  2. Synthetic resins method
  3. Calgon’s method
  4. Clark’s method
Out of syllabusNEET (UG) 2019
5

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
Out of syllabusNEET 2018
6

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)
7

(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
8

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)
9

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

  1. NH3
  2. H2O
  3. B2H6
  4. CH4
AIPMT 2010 (Prelims)
10

The structure of H2O2 is

  1. spherical
  2. non-planar
  3. planar
  4. linear
Out of syllabusAIPMT 2003
11

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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