Verify LCM × HCF = Product of Two Numbers
❓ Question Find the LCM and HCF of the following pairs of integers and verify that: LCM × HCF = Product of the two numbers (i) 26 and 91 (ii) 5…
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Match Bond Pair and Lone Pair on Central Atom
❓ Question Match the following molecules/ions with the ratio: Bond pair : Lone pair (on the central atom) Molecule/Ion Ratio Options A. I C l 2 …
Bond Pair and Lone Pair Counting Shortcut
❓ Concept Question How do we quickly find the ratio of: Bond Pairs : Lone Pairs on the central atom in molecules and ions? 🖼 Concept Image …
Ammonia Detection Using Nessler Reagent Trick
❓ Concept Question How do we identify NH₃ gas in salt analysis using confirmatory tests ? 🖼 Concept Image ✍️ Short Concept This is a stand…
Identify Gas and Reagent from Brown Precipitate
❓ Question When a salt is treated with NaOH , gas X is evolved. Passing gas X through reagent Y gives a brown coloured precipitate . Find X and …
Express Numbers as Product of Prime Factors
❓ Question Express each number as a product of its prime factors: (i) 140 (ii) 156 (iii) 3825 (iv) 5005 (v) 7429 🖼️ Solution Image ✍️ S…
Dalton Law Mole Fraction Trick for Gas Mixtures
❓ Concept Question In gas mixtures, why can’t we directly use mass percentage to find partial pressure ratios ? 🖼 Concept Image ✍️ Short Co…
Partial Pressure Ratios Using Mole Fraction Method
❓ Question At sea level, dry air composition: N₂ = 70% O₂ = 27% Ar = 3% Total pressure = 1.15 atm Find: 1️⃣ P N 2 : P O 2 P_{N_2} : P_{O_…