Chemistry Basic Unit 1 Test

Molecular mass of 18g of water means

• One gram atom

• One gram formula ion

• One gram molecule

• Eighteen moles

Which of the following elements atom can exist independently

• Helium

• Hydrogen

• Potassium

• Chlorine

The iso-electronic set of species is

• H, H⁺¹, H^–1

• Na⁺¹, Li^+1, K⁺¹

• Ca⁺², Ar, Cl^–1

• Ne, Ar, Kr

…………………… has the same number of isotopes as chlorine

• Fluorine

• Boron

• Calcium

• Neon

Chlorine atom and chloride ion have same

• Chemical properties

• Respective radii

• Number of electrons

• Nucleons

Chlorine atom and chloride ion have same

One mole of ethanol and dimethyl ether have all same except

• Atoms

• Molar mass

• Molecules

• Structural formula

The mass of chlorine atoms in 2 mole of chloroform

• 71 g

• 284 g

• 213 g

• 142 g

The volume occupied by 7.1 g of chlorine gas at S.T.P is

• 2.24 dm³

• 4.48dm³

• 1.12 dm³

• 3.36 dm³

Number of moles of CO₂ which contains 8.0 g oxygen is

• 1.0 mole

• 0.50 mole

• 0.25mole

• 0.75 mole