CLASS IX SCIENCE CHAPTER-3 ATOMS AND MOLECULES QUIZ

The Chemical Symbol for nitrogen gas is :-

• Ni

• N2

• N+

• N

The Chemical Symbol For Sodium is

• So

• Sd

• NA

• Na

Percentage Of Calcium in calcium carbonate is

• 40

• 30

• 48

• 36

In a chemical reaction, the sum of the masses of the reactants and products remain unchanged. This is called

• Conservation of mass

• Law of conservation of mass

• Atomicity

• Atomic mass

The combining power of an element is known as

• Mass

• Valency

• Atomicity

• Atomic mass

The number of atoms present in one molecule of the substance is called

• Atomicity

• Mass

• Atomic pressure

• All of the above

What is the mass of a proton and a neutron ?

• 1 amu

• 4 amu

• 5 amu

• 9 amu

Energy can neither be created nor destroyed. Its is a

• Energy recreation

• Energy is cannot reform

• Law of conservation of energy

• Law of conservation

Smallest particle of matter called

• Tiny particle

• Tiny molecule

• Molecule

• Atom

How to calculate Molecular mass

• Sum of proton number and electron number

• Multiplication of proton number and electron number

• Sum of proton number and neutron number

• Multiplication of proton number and neutron number