MCQ Chapter 2 Class 7 Science Curiosity NCERT Advertisement Exploring Substances: Acidic, Basic, and Neutral 1. Which acid is commonly found in lemons?Tartaric acidCitric acidAcetic acidFormic acidQuestion 1 of 202. What is the primary acid in tamarind?Citric acidOxalic acidTartaric acidAscorbic acidQuestion 2 of 203. Which plant’s flowers change color based on soil acidity or basicity?Red rosePurple cabbageHydrangeaTurmericQuestion 3 of 204. Why is turmeric referred to as a ‘Golden’ spice?It is a neutral substanceIt has health benefitsIt is acidic in natureIt is a synthetic indicatorQuestion 4 of 205. Who is known as the ‘Father of Modern Indian Chemistry’?KeerthiPrafulla Chandra RayAshwinGurbirQuestion 5 of 206. What color does blue litmus solution turn when added to diluted lemon juice?BlueGreenRedYellowQuestion 6 of 207. What happens to the color of a solution when lime water is added to acidic lemon juice with blue litmus?Stays redTurns blueTurns greenTurns yellowQuestion 7 of 208. What type of reaction occurs when an acid and base mix in sufficient quantity?Combustion reactionNeutralization reactionDecomposition reactionSynthesis reactionQuestion 8 of 209. What remedy was applied to relieve the pain of an ant bite?Lemon juiceMoist baking sodaSugar solutionVinegarQuestion 9 of 2010. Which indicator was used by Ashwin to write a message on turmeric-coated paper?Lemon juiceSoap solutionSugar solutionSalt solutionQuestion 10 of 2011. What color does turmeric paper remain in an acidic solution?RedYellowBlueGreenQuestion 11 of 2012. Which substance can act as an acid-base indicator besides litmus and red rose extract?Sugar solutionPurple cabbageSalt solutionTap waterQuestion 12 of 2013. What observation is made when tamarind water is added to onion-soaked cloth strips?No change in odorOdor becomes strongerOdor changesOdor disappearsQuestion 13 of 2014. What is the color of hydrangea flowers in acidic soil?PinkRedBlueYellowQuestion 14 of 2015. Which solution would reverse the change if a solution turns red litmus blue?Lime waterVinegarBaking sodaCommon salt solutionQuestion 15 of 2016. If red rose extract turns green in a solution, what is the solution’s nature?AcidicBasicNeutralSaltyQuestion 16 of 2017. What happens when baking soda is added to a red-tinted grape juice and red rose extract mixture?Turns greenStays redTurns blueTurns yellowQuestion 17 of 2018. Which indicator can be used to reveal a message written with orange juice?Sugar solutionSoap solutionTurmeric paperSalt solutionQuestion 18 of 2019. Can turmeric paper alone identify vinegar, baking soda solution, and sugar solution?Yes, it identifies all threeNo, it cannot distinguish acidic and neutralYes, it turns red for allNo, it only identifies basic substancesQuestion 19 of 2020. Why do bubbles appear when vinegar is spilled on eggshell but not with soap solution?Soap solution is neutralVinegar is basicVinegar is acidic and reacts with calcium carbonateEggshell is basicQuestion 20 of 20 Loading...
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