5A 6A 7A Periodic table

Which of the following is a member of 5A group?

• Nitrogen

• Oxygen

• Boron

• Potassium

Which of the following is a non metal?

• Bi

• Sb

• As

• N

Nitrogen molecule is in nature as N₂. What kind of bonds are between atoms of nitrogen?

• Ionic bond

• Covalent bond

• Metallic bond

• Nonmetallic bond

Whats the percentage of nitrogen gas in air?

• 21%

• 23%

• 78%

• 71%

Nitrogen reacts with hydrogen to form:

N₂ + H₂ =

• sodium hydroxide NaOH

• nitrogen hydroxide NOH

• Ammonium hydroxide NH₄OH

• Ammonia NH₃

Ammonia is a:

• gas with sharp odor

• liquid with sweet color

• solid with bad odor

• liquid with tasty odor

Whats the formula of dinitrogen trioxide?

• N₂O

• N₂O₃

• NO

• NO₂

Nitric acid formula is:

• HNO₂

• HNO₃

• HNO

• HNO₄

Electronic configuration of phosphorous is:

• 1s²2s²2p⁶3s²3p¹

• 1s²2s²2p⁶3s²3p²

• 1s²2s²2p⁶3s²3p³

• 1s²2s²2p⁶3s²

Bones and teeths have a high percentage of:

• calcium phosphate

• calcum phosphite

• calcium oxide

• calcium hydroxide