Atoms and Molecules

Which of the following statements is not true about an atom?

• Atoms are always neutral in nature

• Atoms are not able to exist independently

• Atoms are the basic units from which molecules and ions are formed

• Atoms aggregate in large numbers to form the matter that we can see, feel or touch

Tags

NGSS.MS-PS1-1

The chemical symbol for nitrogen gas is

• ni

• N2

• N

• NI

The chemical symbol for sodium is

• so

• SO

• Na

• NA

Which of the following has maximum number of atoms?

• 18g of H2O

• 18g of O2

• 18g of CO2

• 18g of CH4

Tags

NGSS.MS-PS1-1

A change in the physical state can be brought about

• only when energy is given to the system

• only when energy is taken out from the system

• when energy is either given to or taken out from the system

• without any energy change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

molecular formula of copper and bromine is

• CuBr2

• CUBR

• Cu2Br

• CuBr

Tags

NGSS.MS-PS1-1

Atomic number of oxygen is

• 4

• 6

• 8

• 12

valency of helium is

• 0

• 3

• 2

• 1

chemical formula of aluminium and hydrogen is

• aLoH

• Al(OH)3

• AL(OH)2

• AloH

Tags

NGSS.MS-PS1-1

The molecular formula of potassium nitrate is ________.

• KNO

• KON

• KNO₃

• KNO₂

Tags

NGSS.MS-PS1-1