MEDIUM #1414

The most electronegative element is?

A Oxygen

B Chlorine

C Nitrogen

D Fluorine ✓

ChemistrySciences MDCATMedical

EASY #1415

Which acid is present in vinegar?

A Citric acid

B Lactic acid

C Acetic acid ✓

D Hydrochloric acid

ChemistrySciences FederalNTS

EASY #1383

The melting point of ice is?

A 0°F

B 0°C ✓

C 32°C

D 100°C

ChemistrySciences FederalNTS

EASY #1386

The chemical symbol of gold is?

A Go

B Gd

C Au ✓

D Ag

ChemistrySciences FederalNTS

EASY #1309

What is the atomic number of Carbon?

A 4

B 6 ✓

C 8

D 12

ChemistrySciences MDCATMedical

EASY #1310

The pH of pure water at 25°C is?

B 5

C 7 ✓

D 14

ChemistrySciences ECATEngineering

HARD #1311

Which element is liquid at room temperature (apart from mercury)?

A Bromine ✓

B Fluorine

C Chlorine

D Gallium

ChemistrySciences MDCATMedical

EASY #1312

Rust is chemically known as?

A Iron(II) oxide (FeO)

B Iron(III) oxide-hydroxide (Fe₂O₃·H₂O) ✓

C Iron carbonate

D Iron sulphide

ChemistrySciences PPSCProvincial PSCs

MEDIUM #1313

Avogadro's number is approximately?

A 3.0 × 10²³

B 6.022 × 10²³ ✓

C 9.0 × 10²³

D 6.022 × 10²²

ChemistrySciences MDCATMedical

EASY #1314

Which gas is responsible for the ozone layer?

A Oxygen (O₂)

B Ozone (O₃) ✓

C Carbon dioxide (CO₂)

D Nitrogen (N₂)

ChemistrySciences FederalNTS

EASY #1266

The chemical formula of water is?

A HO

B H₂O ✓

C H₂O₂

D OH

ChemistrySciences FederalNTS

EASY #1274

The process by which water changes from liquid to gas is called?

A Condensation

B Sublimation

C Evaporation ✓

D Precipitation

ChemistrySciences FederalNTS