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❓ 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 …

❓ Question Express each number as a product of its prime factors: (i) 140 (ii) 156 (iii) 3825 (iv) 5005 (v) 7429 🖼️ Solution Image ✍️ S…

❓ Concept Question In gas mixtures, why can’t we directly use mass percentage to find partial pressure ratios ? 🖼 Concept Image ✍️ Short Co…

❓ 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_…

❓ 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 …

❓ Question Find the HCF of 96 and 404 by prime factorisation method. Hence, find their LCM . 🖼️ Solution Image ✍️ Short Solution This is a prime …

❓ Question Find the LCM and HCF of 6 and 20 by prime factorisation method . 🖼️ Solution Image ✍️ Short Solution This is a prime factorisat…

❓ 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…

❓ 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 …