Examples of linear molecular geometry in chemistry

📚 Quick Study Guide

• 📏 Definition: Linear molecular geometry describes molecules where atoms are arranged in a straight line. The bond angle is 180°.
• ⚛️ Central Atom: Typically, the central atom has two bonding pairs and no lone pairs of electrons.
• 🧪 Examples: Common examples include molecules like $BeCl_2$, $CO_2$, and $C_2H_2$.
• 🧮 Formula: The general formula is $AX_2$, where A is the central atom and X represents the surrounding atoms.
• 💡 Key Concept: The arrangement minimizes electron repulsion according to VSEPR theory.

🧪 Practice Quiz

1. Question 1: Which of the following molecules exhibits linear molecular geometry?
   1. A) $H_2O$
   2. B) $NH_3$
   3. C) $CO_2$
   4. D) $SO_2$
2. Question 2: What is the bond angle in a linear molecule?
   1. A) 90°
   2. B) 109.5°
   3. C) 120°
   4. D) 180°
3. Question 3: According to VSEPR theory, what is the primary reason molecules adopt a linear geometry?
   1. A) To maximize bond strength
   2. B) To minimize electron repulsion
   3. C) To increase polarity
   4. D) To maximize atomic attraction
4. Question 4: Which of the following molecules is NOT linear?
   1. A) $BeH_2$
   2. B) $HCN$
   3. C) $BF_3$
   4. D) $C_2H_2$
5. Question 5: What is the general formula for a linear molecule with a central atom (A) and two surrounding atoms (X)?
   1. A) $AX_3$
   2. B) $AX_2E$ (where E is a lone pair)
   3. C) $AX_4$
   4. D) $AX_2$
6. Question 6: Which of the following characteristics is typical of a molecule with linear geometry?
   1. A) The central atom has lone pairs of electrons.
   2. B) The central atom has three bonding pairs.
   3. C) The central atom has two bonding pairs and no lone pairs.
   4. D) The central atom has four bonding pairs.
7. Question 7: Which molecule has a linear shape?
   1. A) Water ($H_2O$)
   2. B) Ammonia ($NH_3$)
   3. C) Carbon Dioxide ($CO_2$)
   4. D) Sulfur Dioxide ($SO_2$)