JUPEB CHEMISTRY ⚗️ MOCK TEST

Which of the following is a noble gas?

• Oxygen

• Argon

• Nitrogen

• Chlorine

The number of protons in an atom is called its ____.

• Mass number

• Atomic number

• Isotope

• Neutron number

Which of these elements is a halogen?

• Sulphur

• Fluorine

• Phosphorus

• Argon

The smallest particle of an element that takes part in a chemical reaction is the ____.

• Atom

• Molecule

• Proton

• Neutron

The relative atomic mass of chlorine is approximately 35.5 because chlorine exists as ____.

• Isomers

• Isotopes

• Allotropes

• Mixtures

The valency of oxygen in water (H₂O) is ____.

• 1

• 2

• 3

• 4

Which of the following is a mixture?

• Sodium chloride

• Water

• Air

• Carbon dioxide

What is the chemical symbol for potassium?

• P

• K

• Po

• Pt

The pH of a neutral solution is ____.

• 0

• 7

• 14

• 10

Which of these is an alkali?

• NaOH

• HCl

• H₂SO₄

• CH₃COOH