Question

Fill in the blanks

1. The molecular formula of Aluminium oxide is ...........

2. A symbol represents a short form of a/an.............

3. Water which is found in natural state is called ......

4. Hydrogen burns in air to give

5. The valency of copper in CuCl2 is
............​

Answer 1

Answer:

Al203 this is Aluminium oxide

Answer 2

1. AL203
2. element
3. liquid

5. +1 and +2

don't know the answer of 4th one