Subject: ChemistryTopic: Chemical Compounds and Their UsesTime: 1.5 HoursMaximum Marks: 50 Section A: Multiple Choice Questions (1 × 10 = 10 marks) Choose the correct answer from the options provided. Which compound is commonly known as baking soda?a) NaOHb) CaCO₃c) NaHCO₃d) Na₂CO₃ What is the chemical
Read MoreGeneral Chemical Names and Formulas Everyday Substances General Name Chemical Name Formula Water Hydrogen monoxide H₂O Common Salt / Table Salt Sodium Chloride NaCl Sand / Quartz Silicon dioxide SiO₂ Marble / Limestone Calcium Carbonate CaCO₃ Washing Soda Sodium Carbonate Na₂CO₃ Caustic Soda Sodium Hydroxide NaOH
Read MoreThe Taste Behind Food: Acids & Bases Ever wondered why lemons taste sour or soap feels bitter? It’s due to the presence of acids and bases in them. Acids Acids are substances that release hydrogen ions (H⁺) when dissolved in water. They usually taste sour. They
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