MCQ Class 7 Science Chapter 4 Acids, Bases and Salts Advertisement MCQ’s For All Chapters – Science Class 7th 1. Out of these gases which one is used in fire extinguishersH2SNO2CO2SO2Question 1 of 102. The correct way of making a solution of acid in water is toadd water to acid in a shallow containermix acid and water simultaneouslyadd water to acidadd acid to waterQuestion 2 of 103. Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed.Red in acid and blue in baseYellow in acid and red in baseYellow in both acid and basePink in acid and yellow in baseQuestion 3 of 104. Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are:colourless and pinkpink and colourlessred and blueblue and redQuestion 4 of 105. When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?Calamine solutionOrganic matterQuick limeSlaked limeQuestion 5 of 106. Which of the following set of substances contain acids?Curd, milk of magnesiaCurd, vinegarGrapes, lime waterVinegar, soapQuestion 6 of 107. On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?BasicEither acidic or basicEither acidic or neutralEither basic or neutralQuestion 7 of 108. Which of the following is an acid-base indicator?Baking sodaVinegarLime waterTurmericQuestion 8 of 109. Which of the following is not a indicator?Methyl chloridePhenolphthaleinMethyl orangeLitmusQuestion 9 of 1010. The reaction in which an acid react with a base to form salt and water is called asSubstitution reactionAddition reactionDisplacement reactionNeutralisation reactionQuestion 10 of 10 Loading...
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