Acids, Bases and Salts Quiz
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Questions and Answers

What is the product formed when sodium hydroxide reacts with zinc?

  • Sodium zincate (correct)
  • Sodium oxide
  • Hydrogen gas
  • Zinc hydroxide

    • What gas is produced when sodium carbonate reacts with dilute hydrochloric acid?

  • Carbon dioxide (correct)
  • Nitrogen
  • Oxygen
  • Hydrogen

    • What observation indicates the presence of carbon dioxide when passed through lime water?

  • The lime water becomes transparent
  • The lime water changes color to blue
  • Gas bubbles form without a color change
  • The lime water turns cloudy (correct)

    • Which of the following statements is true regarding the reaction of acidic solutions with metal carbonates?

    <p>A salt and water are produced along with carbon dioxide.</p> Signup and view all the answers

    What happens to sodium hydrogencarbonate when it is mixed with dilute hydrochloric acid?

    <p>It produces salt, carbon dioxide, and water.</p> Signup and view all the answers

    What color does red litmus paper turn when placed in a basic solution?

    <p>Turns blue</p> Signup and view all the answers

    Which of the following is a natural indicator used for testing acids and bases?

    <p>Turmeric</p> Signup and view all the answers

    What is the effect of an acidic solution on blue litmus paper?

    <p>Turns it red</p> Signup and view all the answers

    What remedy would be suggested for acidity after overeating?

    <p>Baking soda solution</p> Signup and view all the answers

    Which substance changes a stain from curry reddish-brown back to yellow?

    <p>Water</p> Signup and view all the answers

    What is the color of litmus solution when it is neutral?

    <p>Purple</p> Signup and view all the answers

    Which of the following natural materials can indicate the presence of acids or bases?

    <p>Red cabbage leaves</p> Signup and view all the answers

    Acids and bases can counteract each other. What term describes this reaction?

    <p>Neutralization</p> Signup and view all the answers

    What is produced when sodium carbonate reacts with hydrochloric acid?

    <p>Sodium chloride, water, and carbon dioxide</p> Signup and view all the answers

    What happens when carbon dioxide is passed through lime water?

    <p>It results in a white precipitate</p> Signup and view all the answers

    The neutralization reaction between sodium hydroxide and hydrochloric acid produces which of the following?

    <p>Water and sodium chloride</p> Signup and view all the answers

    When excess carbon dioxide is reacted with calcium carbonate and water, what is formed?

    <p>Calcium bicarbonate</p> Signup and view all the answers

    What occurs when you add hydrochloric acid to a solution of copper oxide?

    <p>Copper oxide dissolves completely without color change</p> Signup and view all the answers

    Which of the following statements about phenolphthalein is correct when mixed with an acid?

    <p>It changes to colorless</p> Signup and view all the answers

    What is the blue-green color of the solution attributed to in the reaction with copper oxide?

    <p>Formation of copper(II) chloride</p> Signup and view all the answers

    What is the general outcome of the reaction between any metal carbonate and an acid?

    <p>Salt, carbon dioxide, and water are produced</p> Signup and view all the answers

    What is produced when a metallic oxide reacts with an acid?

    <p>Salt and water</p> Signup and view all the answers

    Which of the following interactions represents a neutralization reaction?

    <p>Sodium hydroxide with hydrochloric acid</p> Signup and view all the answers

    Which of the following statements about non-metallic oxides is true?

    <p>They are always acidic in nature.</p> Signup and view all the answers

    What does the effervescence during a reaction between a metal and dilute hydrochloric acid indicate?

    <p>Hydrogen gas is produced.</p> Signup and view all the answers

    What is the general formula for the reaction between a metal oxide and an acid?

    <p>Metal oxide + Acid → Salt + Water</p> Signup and view all the answers

    When testing for the presence of hydrogen gas, what reaction would confirm its presence?

    <p>It burns with a pop sound.</p> Signup and view all the answers

    Which chemical property is common to all acids and is responsible for their reactions with metals?

    <p>Generation of hydrogen gas</p> Signup and view all the answers

    In the reaction between carbon dioxide and calcium hydroxide, what is formed?

    <p>Calcium carbonate</p> Signup and view all the answers

    What happens to copper sulphate when it is heated in a dry boiling tube?

    <p>It turns white.</p> Signup and view all the answers

    What is the effect of adding water to the heated copper sulphate?

    <p>It turns back to blue.</p> Signup and view all the answers

    How many water molecules are present in one formula unit of hydrated copper sulphate?

    <p>5</p> Signup and view all the answers

    What is the chemical formula for calcium sulphate hemihydrate, commonly known as Plaster of Paris?

    <p>CaSO4·H2O</p> Signup and view all the answers

    What does the water of crystallisation refer to?

    <p>The fixed number of water molecules in a salt.</p> Signup and view all the answers

    What is the chemical formula of gypsum?

    <p>CaSO4·2H2O</p> Signup and view all the answers

    At what temperature is gypsum heated to become Plaster of Paris?

    <p>373 K</p> Signup and view all the answers

    Which statement is true regarding the properties of copper sulphate?

    <p>It can be used as a drying agent.</p> Signup and view all the answers

    What is the main product of the neutralization reaction between an acid and a base?

    <p>Salt</p> Signup and view all the answers

    What happens when water is added to strong acids like H2SO4?

    <p>It causes the mixture to splash and can lead to burns</p> Signup and view all the answers

    What is the term for the process that occurs when an acid or base is mixed with water?

    <p>Dilution</p> Signup and view all the answers

    Which statement correctly describes the nature of mixing concentrated acids with water?

    <p>Should be done slowly with constant stirring</p> Signup and view all the answers

    What ions are generated by acids and bases in an aqueous solution?

    <p>H3O+ and OH-</p> Signup and view all the answers

    What is the expected outcome of the activity of adding H2SO4 to water?

    <p>It will increase the temperature of the solution</p> Signup and view all the answers

    What is the hazard associated with adding water to concentrated acids?

    <p>It may cause violent splashing</p> Signup and view all the answers

    Why do substances like alcohol and glucose not show acidic character in solutions?

    <p>They do not dissociate to produce H+ ions</p> Signup and view all the answers

    Study Notes

    Acids, Bases and Salts

    • Acids taste sour and change the color of blue litmus to red
    • Bases taste bitter and change the color of red litmus to blue
    • Litmus is a natural indicator
    • Turmeric is another natural indicator
    • Synthetic indicators include methyl orange and phenolphthalein
    • Acids and bases can neutralize each other's effects
    • Acids react with metals to produce a salt and hydrogen gas
    • Metal carbonates and hydrogencarbonates react with acids to produce a salt, water, and carbon dioxide
    • Acids react with bases to produce a salt and water
    • Bases react with some metals to produce a salt and hydrogen gas
    • Some oxides are acidic, some are basic
    • The pH scale measures the acidity or basicity of a solution
    • The pH scale ranges from 0 to 14
    • A pH of 7 is neutral
    • A pH less than 7 is acidic
    • A pH greater than 7 is basic
    • Substances like vanilla, onion, and clove can be used as olfactory indicators
    • Tooth decay occurs when the mouth's pH falls below 5.5
    • Common salt (sodium chloride) is a raw material for several other substances, including sodium hydroxide, baking soda, and washing soda
    • Sodium hydroxide is produced through the chlor-alkali process
    • Chlorine and hydrogen gas are also produced during this process
    • Bleaching powder is made by reacting chlorine with calcium hydroxide
    • Baking soda (sodium hydrogen carbonate) is used in cooking and as an antacid
    • Washing soda (sodium carbonate) is used in many industries and as a cleaning agent
    • Plaster of Paris is a calcium sulfate hemihydrate that hardens when mixed with water

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    Acids, Bases and Salts PDF

    Description

    Test your understanding of acids, bases, and salts with this informative quiz. Explore the properties of these substances, their indicators, and the pH scale. Whether you're studying for a class or just interested in chemistry, this quiz will enhance your knowledge.

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