Q1 · medium · AI-verified
Which period of the modern periodic table contains the lanthanides and actinides (f-block elements)?
- Period 4 and Period 5
- Period 7 and Period 8
- Period 6 and Period 7
- Period 5 and Period 6
Q2 · medium · AI-verified
Which of the following elements has the highest electronegativity on the Pauling scale?
- Nitrogen (N)
- Fluorine (F)
- Oxygen (O)
- Chlorine (Cl)
Q3 · easy · AI-verified
Which of the following processes converts a solid directly into gas without passing through the liquid state?
- Evaporation
- Fusion
- Condensation
- Sublimation
Q4 · medium · AI-verified
Van der Waals equation for real gases is written as (P + an²/V²)(V - nb) = nRT. Here, the constant 'a' represents:
- Kinetic energy of molecules
- Volume occupied by gas molecules
- Intermolecular forces of attraction
- Mean free path of molecules
Q5 · easy · AI-verified
Which state of matter has a definite volume but no definite shape?
- Liquid
- Plasma
- Gas
- Solid