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_…
LCM & HCF of 3 Numbers Using Prime Factorisation ❓ Question Find the LCM and HCF of 6, 72 and 120 using prime factorisation method . 🖼️ Solution Image ✍️ Short Solution This is a 3-number prime …
HCF & LCM Using Prime Factorisation ❓ Question Find the HCF of 96 and 404 by prime factorisation method. Hence, find their LCM . 🖼️ Solution Image ✍️ Short Solution This is a prime …
Prime Factorisation Method for LCM & HCF ❓ Question Find the LCM and HCF of 6 and 20 by prime factorisation method . 🖼️ Solution Image ✍️ Short Solution This is a prime factorisat…
Units Digit Patterns in Powers of 4 ❓ Question Consider the number 4 n 4^n , where n n n is a natural number. Check whether there is any value of n n n for which 4 n 4^n ends wit…
First Order Reaction Using Pressure Data ❓ Concept Question For a gas-phase first order reaction: A ( g ) → 2 B ( g ) + C ( g ) A(g) \rightarrow 2B(g) + C(g) How do we use pressure data …