Question

A. Choose the correct option.
1. Which of these is not an element? a. Silicon
b. Water
C. Nitrogen
d. Aluminium
2. Which of these is the chemical symbol of the element cobalt?
a. C
b. Ct
C. Co
d. Cob
3. The chemical formula for potassium carbonate is
a. PCO 3
b. KCO 2
c. KCO 3
d. K 2 CO 3
4. The combining capacity of an element is called its
a. atomicity
b. chemical formula
C. precipitate
d. valency
5. Which of these does not prevent rusting?
a. Spraying with salt water
b. Painting
c. Applying grease
d. Coating with tin ​

Answer 1

Answer:

1) Option b

2) Option C

3) option d

4) option d

5) option a

Hope that my answers helps you.

Answer 2

Answer:

1. Water
2. Co
3. K2 CO3
4. valency
5. Spraying with salt water