10 CBSE RIDERS

What is the chemical symbol of Sodium element?

• S

• Se

• Na

• Mg

The atomic number of calcium element is

• 10

• 20

• 30

• 18

The valence electrons in the element Nitrogen N

• 5

• 3

• 2

• 1

What is the valence of the nitrogen atom ?

• 1

• 2

• 3

• 4

The name of the element Ar is ?..........

• Argon

• Arsenic

• Antimony

• Aluminum

The magnesium burns in the presence of oxygen with bright flame to form ...........

• Magnesium hydroxide

• Magnesium sulphate

• Magnesium chloride

• Magnesium oxyde

The chemical formula of iron rust is ............

• Fe2o3

• Feo

• Fe2o4

• Feo3

The number of atoms of reactions is ................to the number of atoms of the products.

• Equal

• Higher

• Unequal

• Less

"Mass nether be created nor destroyed" , is nothing but......

• Universal law

• Energy mass relation

• Law of conservation of mass

• Charles law

Stating the products and reactants in the chemical reactions using symbols is called as......

• Skeletal equation

• Balanced equation

• Differential equation

• Integral equation