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