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Hydrogen · Question 14

AIPMT 2000MCQEasy📈 Topic in 38% papers+4−1
1

The life span of atomic hydrogen is

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

Answer

(1) fraction of one second

Solution

Atomic hydrogen is obtained by dissociating H2 (e.g. in an electric arc).

⇒ The free H atoms are highly reactive and quickly recombine: H + H H2 ; H = -436 kJ mol-1

⇒ Hence atomic hydrogen exists only for a very short time (half-life about 0.3 s).

∴ Its life span is a fraction of one second.

Answer: (1)

Out of syllabusAIPMT 2000

Keep practising — Hydrogen

2

Methane reacts with steam at 1273 K in the presence of nickel catalyst to form :

  1. CO and H2
  2. CO and H2O
  3. CO2 and H2
  4. CO2 and H2O
NEET (UG) 2026
3

Which of the following statements are NOT correct? Choose the most appropriate answer from the options given below:

  1. B, D only
  2. D, E only
  3. A, B, C only
  4. B, C, D, E only
Out of syllabusNEET (UG) 2023
4

Match List-I with List-II. Choose the correct answer from the options given below:

  1. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
  2. (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
  3. (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
  4. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
NEET (UG) 2022
5

The element used for welding metals with high melting points is

  1. He
  2. Cl2
  3. H2
  4. Ne
Out of syllabusNEET (UG) 2022 (Phase 2)
6

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
7

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
8

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
9

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
10

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)
11

(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

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