Elements in the modern periodic table are arranged in ___________ vertical columns.
Which of the following is a tough, porous and black substance obtained from coal?
| Substance |
pH |
| i. Lemon juice |
a. 14 |
| ii. Gastric juice |
b. 1.2 |
| iii. Milk of magnesia |
c. 2.2 |
| iv. Sodium hydroxide |
d. 10 |
| solution |
Elements in the modern periodic table are arranged in ___________ vertical columns.
Suggested Test Series
Suggested Test Series