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Hydrogen · Question 2

NEET (UG) 2023MCQMedium📈 Topic in 38% papers+4−1
1

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

Answer

(2) D, E only

Solution

A. Correct: H2 reduces heavy metal oxides to metals.

B. Correct: D2O is used to study reaction mechanisms (isotope effects).

C. Correct: hydrogenation of vegetable oils gives saturated fats (vanaspati).

D. Not correct: the H-H bond dissociation enthalpy (435.88 kJ mol-1) is the highest for a single bond between two atoms of any element.

E. Not correct: hydrogen reduces oxides of metals that are less active than iron.

D and E are not correct.

Answer: (2)

Out of syllabusNEET (UG) 2023

Keep practising — Hydrogen

2

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
3

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)
4

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
5

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
6

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
7

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
8

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)
9

(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
10

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)
11

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

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

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