Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q3 (CAPF/2018) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Applied everyday chemistry Answer Verified

Which one of the following gemstones contains beryllium metal?

Result
Your answer: —  Â·  Correct: B
Explanation

Emerald is a precious gemstone and a variety of the mineral beryl, which is chemically defined as beryllium aluminum silicate with the formula Be3Al2(SiO3)6 [1]. Beryl is the primary industrial source of the light metal beryllium [1]. While pure beryl is colorless (goshenite), the presence of trace elements like chromium or vanadium gives emerald its characteristic deep green hue. Other varieties of beryl include aquamarine (blue) and morganite (pink) [1]. In contrast, ruby and blue sapphire are varieties of the mineral corundum, which is composed of aluminum oxide (Al2O3) and does not contain beryllium. Topaz is an aluminum silicate containing fluorine and hydroxyl groups, also lacking beryllium. Therefore, among the given options, only emerald contains the metal beryllium as a fundamental constituent of its crystal lattice.

Sources

  1. [1] https://www.britannica.com/science/beryl
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.
67%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

CAPF · 2020 · Q9 Relevance score: -1.01

Which one of the following statements about alkaline • earth metals is NOT true ?

CDS-II · 2013 · Q103 Relevance score: -2.89

Among the precious stones, the most extensive foreign trade during the Gupta age was that of :

IAS · 2007 · Q133 Relevance score: -3.08

Which one of the following does not contain silver?