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5+5×5-5 = ?

Chemistry Grade 11 Unit 2 MCQ with explanation
#Target Grade #11 #12

1. Which compound contains a coordinate covalent bond?
A. O₂
B. NH₄⁺
C. CO₂
D. NaCl

2. Which molecule is polar?
A. CCl₄
B. CO₂
C. NH₃
D. CH₄

3. Which compound has both ionic and covalent bonds?
A. MgO
B. CH₃OH
C. KNO₃
D. Cl₂

4. Which molecule has a linear geometry?
A. H₂O
B. CO₂
C. NH₃
D. CH₄

5. What is the bond order in O₂⁺?
A. 2.5
B. 3.0
C. 1.5
D. 2.0

Answers and Explanations:

1. Answer: B. NH₄⁺
Explanation: NH₄⁺ has a coordinate covalent bond. This bond occurs when one atom provides both electrons for the shared pair, in this case, from NH₃ to H⁺.

2. Answer: C. NH₃

3. Answer: C. KNO₃
Explanation: KNO₃ contains ionic bonds between the K⁺ cation and the NO₃⁻ anion. Within the NO₃⁻ anion, covalent bonds exist between the nitrogen and oxygen atoms.

4. Answer: B. CO₂
Explanation: CO₂ is linear due to sp hybridization of the central carbon atom. Each carbon atom is double bonded to the Oxygen atoms.

5. Answer: A. 2.5

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🌟 A Fun Analogy to Remember the Nernst Equation
🎭 The "Electro-Café" Story ☕⚡
Imagine a cozy little café called Electro-Café. It has two tables (like two electrodes), and both serve lemon juice (ions in solution). The same juice is used, but one glass is super concentrated (sour!), and the other is diluted (less sour).
Now, the lemon atoms don’t like imbalance. So, the café sets up a wire between the tables. Sourness (concentration difference) causes electrons (guests) to move from the less sour to the more sour glass — trying to make both glasses equally tangy 🍋⚖️.
The Nernst Equation helps calculate how much “electrical sourness” (voltage) this café produces based on:

How different the concentrations are (Q)


How many guests (electrons) are exchanged (n)


How hot the café is (Temperature T)


🎉 Moral of the story:
Voltage = Standard Voltage - Correction for imbalance
(E = E° − (0.0591/n) log Q)

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2 + 3 × 4 - 1 = ?

Welcome to quiz biology

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🧪💡 How to calculate Normality of a solution?

To find the Normality (N) of a solution, use this simple formula:
N=Given mass/Equivalent weight×Volume (L)
N=Equivalent weight×Volume (L)Weight of solute (g)​​

🧠 Example:

👉 What is the normality of a solution that contains 19.6 g of H₂SO₄ in 20 mL of solution?
✨ Step-by-step:

Molar mass of H₂SO₄ = 98 g/mol

Basicity (number of H⁺ ions) = 2

Equivalent weight = 98 ÷ 2 = 49 g/equiv

Volume in L = 20 mL = 0.020 L

Now plug into the formula:
N=19.649×0.020=19.60.98=20 N
N=49×0.02019.6​=0.9819.6​=20N​

📌 Final Answer:
✅ The normality is 20 N

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What’s the difference between Inversion and Reciprocal Translocation?
Let’s make it simple!
🔄 Inversion
A piece of one chromosome breaks off, flips around, and sticks back on in the opposite direction!
No extra or missing DNA — just reversed.
Happens inside the same chromosome.
Can be harmless, but may cause problems during reproduction.
Two types:
Paracentric (centromere NOT involved)
Pericentric (centromere IS involved)
🔁 Reciprocal Translocation
Two different chromosomes break and swap pieces with each other!
Usually no DNA lost — just moved around (called "balanced").
If some DNA is lost or duplicated, it’s called "unbalanced" — and that can cause problems.
Might not affect the person, but can cause miscarriages or genetic conditions in children.
⚡ Quick Summary:
Inversion = Flip within ONE chromosome.
Reciprocal Translocation = Swap between TWO chromosomes.


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