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24 questions · No time limit
24 marks · +1 per question
Use these 24 original questions to check the distinctions that connect matter, formulae, atomic structure and reactions. They are interleaved so you must choose the right idea before calculating. Each question has one defensible answer under its stated conditions. This is free, untimed learning practice. Score +1 for a correct answer and 0 for an incorrect or unattempted answer, with no negative marking. There is no imposed pass cutoff. The total 24 follows the distinct learning decisions; it is not a prediction of RRB chemistry weightage or a full CBT simulation. English and Hindi are two versions of the same 24 items, not 48 separate questions. Try the questions before reading the explanations. Afterwards, explain why your chosen answer works and why the alternatives fail. A correct guess without the reason identifies something to revisit. If you miss a distinction, revisit the matching teaching lesson in this module before trying again. All masses, ion charges and unfamiliar reactivity/solubility facts needed are supplied. Use the taught shell model for neutral atoms of the first 18 elements only where stated. Average atomic mass must be interpreted, but concentration percentages and weighted-average arithmetic are not tested. The optional electron-accounting bridge is not tested either. No question asks you to taste, smell, mix, heat, generate gases or handle chemical materials.
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