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- 1. Multiple Choice
What is the chemical symbol of Sodium element?
S
Se
Na
Mg
- 2. Multiple Choice
The atomic number of calcium element is
10
20
30
18
- 3. Multiple Choice
The valence electrons in the element Nitrogen N
5
3
2
1
- 4. Multiple Choice
What is the valence of the nitrogen atom ?
1
2
3
4
- 5. Multiple Choice
The name of the element Ar is ?..........
Argon
Arsenic
Antimony
Aluminum
- 6. Multiple Choice
The magnesium burns in the presence of oxygen with bright flame to form ...........
Magnesium hydroxide
Magnesium sulphate
Magnesium chloride
Magnesium oxyde
- 7. Multiple Choice
The chemical formula of iron rust is ............
Fe2o3
Feo
Fe2o4
Feo3
- 8. Multiple Choice
The number of atoms of reactions is ................to the number of atoms of the products.
Equal
Higher
Unequal
Less
- 9. Multiple Choice
"Mass nether be created nor destroyed" , is nothing but......
Universal law
Energy mass relation
Law of conservation of mass
Charles law
- 10. Multiple Choice
Stating the products and reactants in the chemical reactions using symbols is called as......
Skeletal equation
Balanced equation
Differential equation
Integral equation
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