Answer
The element, X is Carbon (C).
Work Step by Step
The colorless crystalline allotrope of Carbon is Diamond.
Carbon reacts with excess oxygen to form $CO_{2(g)}$.
$CO_{2(g)}$ reacts with water to form carbonic acid ($H_{2}CO_{3(aq)})$.
Chemistry 12th Edition
by Chang, Raymond; Goldsby, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0078021510
ISBN 13:
978-0-07802-151-0
Chapter 8 - Periodic Relationships Among the Elements - Questions & Problems - Page 366: 8.138
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