BANK OF MCQs

Download Group–I A 1.       Li-Na-K-Rb-Cs-Fr 2.       Group first members are called alkali metals since they form oxides and hydroxides which combine with water to produce alkaline solution. 3.       Li-Na and K are safe to save in school lab and rest are violently reactive. 4.       They are softer than other metals and can cut with knife. 5.       These metals are lighter than other elements and having low melting point, boiling point and density. Atomic and physical properties 6.       Down the group; ·         Atomic radius → Increases ·         Density → Decreases ·         Ionization energy → Decreases ·         Electronegativity → Decreases ·    ...

Physical and atomic properties 1.       Na – Mg – Al – Si – P – S – Cl – Ar 2.       Metallic radii for sodium, magnesium and aluminium. 3.       Covalent radii for silicon, phosphorus , sulphur and chlorine 4.       Van der wall radii for Argon. 5.       Ionization energy increase from left to right, exception→ Al and S. 6.       Electronegativity increases from left to right, exception → Ar 7.       Sodium , magnesium and aluminium are best conductors. 8.       Silicon is semiconductor. 9.       Phosphorus, sulphur, chlorine and argon are non-conductors. 10. Melting point and boiling point values increase up to Al and then decreases. Reaction of 3 rd period elements with ...