Doubtify – JEE & Class 10 Questions with Step-by-Step Solutions

❓ Concept Question When a strong acid solution is diluted by adding equal volume of water, how does the pH change ? 🖼 Concept Image ✍️ Shor…

❓ Concept Question In Group 14 elements, how do we determine whether ions like A 2 + A^{2+}  or B 4 + B^{4+}  behave as oxidising or reducing agen…

❓ Question Given complex: Co ⋅ 5 N H 3 ⋅ C l ⋅ S O 4 \text{Co} \cdot 5NH_3 \cdot Cl \cdot SO_4 Two isomers A and B: A gives white ppt with AgN…

❓ Question Among: Cr, Fe, Co, Ni Which metal has the lowest enthalpy of atomisation ? Find the number of valence electrons in that metal. 🖼 Q…

❓ Question Reaction: A ( g ) → 2 B ( g ) + C ( g ) A(g) \rightarrow 2B(g) + C(g) First order reaction Given: t (min) Pressure (mm Hg) 10 160 ∞ …

❓ Concept Question How do we calculate the apparent shift of bottom when light passes through multiple liquid layers ? 🖼 Concept Image ✍️ S…

❓ Concept Question How do we calculate the moment of inertia of a system of different bodies about a given axis? 🖼 Concept Image ✍️ Short C…

❓ Question Two statements are given: Statement I: Mohr's salt is composed of only three types of ions — ferrous, ammonium and sulfate . Sta…

❓ Question Find the total enthalpy change when 1 mol of water is converted from: 10 ∘ C → − 10 ∘ C  (ice) 10^\circ C \rightarrow -10^\circ C \tex…