Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q55 (NDA-II/2021) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Periodic table elements

Which one of the following pairs of elements is liquid at room temperature and at normal pressure ?

Result
Your answer: —  Â·  Correct: B
Explanation

At room temperature (approximately 20–25 °C) and normal pressure, only two elements exist in a liquid state: mercury and bromine. Mercury (Hg) is the only metal that is naturally liquid at standard room temperature, with a melting point of -38.83 °C. Bromine (Br) is the only non-metal that exists as a liquid under these conditions, possessing a melting point of -7.2 °C. While elements like gallium (Ga) and caesium (Cs) have very low melting points (29.76 °C and 28.5 °C respectively), they are technically solids at standard room temperature and only liquefy when slightly heated or held in the palm of a hand [1]. Therefore, the pair that is liquid at room temperature and normal pressure is mercury and bromine.

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 3: Metals and Non-metals > Table 3.1 > p. 40
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.
62%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

CDS-II · 2020 · Q98 Relevance score: 21.25(s)

Identify the correct pair of elements among the following which are liid at room temperature and standard pressure.

NDA-II · 2009 · Q83 Relevance score: 15.37(s)

Which one of the following elements exists in liquid state at room temperature?

CDS-II · 2013 · Q19 Relevance score: 11.65(s)

What are the elements which are liquids at room temperature and standard pressure ? 1. Helium 2. Mercury 3. Chlorine 4. Bromine Select the correct answer using the code given below :

CDS-II · 2009 · Q94 Relevance score: 8.32(s)

Which one of the following is considered normal blood pressure in man?

NDA-II · 2016 · Q15 Relevance score: 7.96(s)

Which one of the following has different number of moleculcs ? (All are kept at normal temperature and pressure)