Change set

Pick exam & year, then Go.

Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q43 (CDS-I/2016) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Periodic table elements Answer Verified

Which one of the following statements is not correct?

Result
Your answer: —  Â·  Correct: C
Explanation

Hydrogen is the lightest known element in the periodic table, with an atomic number of 1. It is a non-metal element that typically exists as a diatomic molecule (H2) [1]. While the question asks for the incorrect statement, option 3 is false because hydrogen does have isotopes. Specifically, it has three naturally occurring isotopes: Protium (the most common, with no neutrons), Deuterium (one neutron), and Tritium (two neutrons) [2]. These isotopes are unique as they are the only ones in chemistry given specific names. Furthermore, hydrogen and oxygen can indeed form highly combustible or explosive mixtures over a wide range of concentrations, representing a significant safety hazard in industrial applications [1]. Therefore, the claim that hydrogen has no isotopes is the only incorrect statement among the choices provided.

Sources

  1. [1] https://www.sciencedirect.com/topics/engineering/hydrogen-explosion
  2. [2] https://www.energy.gov/science/doe-explainsdeuterium-tritium-fusion-fuel
How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
60%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

CDS-II · 2024 · Q77 Relevance score: 6.02

Which one among the following statements for the gases mentioned below is not correct?

CDS-II · 2013 · Q21 Relevance score: 5.10

Which one among the following is not a correct statement ?

NDA-I · 2014 · Q45 Relevance score: 4.76

Which of the following statements about hydrogen is /are correct? 1. Hydrogen has three isotopes of which protium is the most common. 2. Hydrogen ion (H+) exists freely in solution. 3. Dihydrogen, H2, acts as a reducing agent. Select the correct answer using the code given below.