MCQ Science and Technology Class 9 Chapter 5 Maharashtra Board Acids, Bases and Salts 1. What is the primary cation produced by an acid in water according to the Arrhenius theory?OH⁻H⁺Na⁺Cl⁻Question 1 of 202. Which substance turns litmus paper red, indicating it is acidic?Baking sodaMilk of magnesiaVinegarWaterQuestion 2 of 203. What type of bond holds the ions together in an ionic compound like NaCl?Covalent bondMetallic bondHydrogen bondIonic bondQuestion 3 of 204. What is the electronic configuration of a chlorine ion (Cl⁻) after gaining one electron?2,8,72,8,12,8,82,8Question 4 of 205. What happens to the ions of an ionic compound when it dissolves in water?They form covalent bondsThey dissociateThey remain unchangedThey evaporateQuestion 5 of 206. Which of the following is a weak acid?HNO₃H₂SO₄CH₃COOHHClQuestion 6 of 207. What is the only anion produced by a base in water according to the Arrhenius theory?H⁺Cl⁻OH⁻SO₄²⁻Question 7 of 208. Which of the following is a strong base?NH₃NaOHCH₃COOHH₂CO₃Question 8 of 209. How is the basicity of an acid defined?Number of OH⁻ ions producedNumber of water molecules formedNumber of H⁺ ions producedNumber of salt molecules formedQuestion 9 of 2010. What is the acidity of a base defined as?Number of H⁺ ions producedNumber of OH⁻ ions producedNumber of salt molecules formedNumber of water molecules formedQuestion 10 of 2011. Why does a solution with less water and the same amount of lemon juice taste more sour?It has a lower concentrationIt has a higher concentrationIt is neutralIt is basicQuestion 11 of 2012. What unit expresses the concentration of a solute as the number of moles per litre?g/LPercentageMolarity (M)Mass fractionQuestion 12 of 2013. What is the pH of a neutral solution like pure water at 25°C?014710Question 13 of 2014. What is the pH range of a basic solution?Less than 7Equal to 7Greater than 7Between 0 and 7Question 14 of 2015. What is the purpose of a universal indicator?To measure temperatureTo detect only acidsTo show different colours at different pH valuesTo measure electrical conductivityQuestion 15 of 2016. What is the most accurate method for measuring the pH of a solution?pH meterLitmus paperUniversal indicatorPhenolphthaleinQuestion 16 of 2017. What happens to the pH of a dilute HCl solution when NaOH is added gradually?It remains constantIt increasesIt decreasesIt becomes acidicQuestion 17 of 2018. What is the net ionic reaction during the neutralization of an acid and a base?H⁺ + OH⁻ → H₂ONa⁺ + Cl⁻ → NaClH⁺ + Cl⁻ → HClH₂O → H⁺ + OH⁻Question 18 of 2019. What gas is produced when zinc reacts with dilute sulphuric acid?OxygenCarbon dioxideHydrogenNitrogenQuestion 19 of 2020. What is the chemical formula of red oxide used in the reaction with HCl?Fe₂O₃FeOFe₃O₄FeCl₃Question 20 of 20 Loading...
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