1. Some basic concept of chemistry — Chemistry STD 11 Science — Question
Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry1. Some basic concept of chemistry1 Mark
MCQ
Which of the following carbon contains only one element
A
Marble
✓
Diamond
C
Glass
D
Sand
✓
Answer
Correct option: B.
Diamond
b Diamond is an allotrope of carbon and is therefore, made up of one element, carbon. Glass, on the other hand, is mainly composed of silica and sodium carbonate. Marble is mainly calcium carbonate and sand is composed of silicon dioxide.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.