CHEMISTRY CH12 Periodic Classification of Elements — Science STD 9 — Question
Tamilnadu BoardEnglish MediumSTD 9ScienceCHEMISTRY CH12 Periodic Classification of Elements2 Marks
Question
Group 1 (except hydrogen) elements are called alkali metals.
✓
Answer
The elements of group 1 (except hydrogen) are metals. They react with water to form solutions that change the colour of a vegetable dye from red to blue. These solutions are said to be highly alkaline or basic. Hence they are called alkali metals.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.