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Acids, Bases and Salts

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

The pH scale and indicators

Subtopic

The pH scale and indicators under Acids, Bases and Salts for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    When Universal Indicator is added to a solution with a pH of 2, what color is most likely to be observed?

    A.

    Blue

    B.

    Red

    C.

    Green

    D.

    Purple

  2. 2.

    Which of these pH values represents the most strongly alkaline solution?

    A.

    pH 8

    B.

    pH 11

    C.

    pH 7

    D.

    pH 14

  3. 3.

    What color change is observed when blue litmus paper is dipped into a solution of hydrochloric acid (HClHCl)?

    A.

    It turns red

    B.

    It turns green

    C.

    It turns yellow

    D.

    It remains blue

Download the worksheet for Acids, Bases and Salts - The pH scale and indicators to practice offline. It includes additional chapter-level practice questions.

Properties of acids and bases

Subtopic

Properties of acids and bases under Acids, Bases and Salts for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which pH value represents the solution with the highest concentration of hydrogen ions (H+H^+)?

    A.

    pH 13

    B.

    pH 7

    C.

    pH 4

    D.

    pH 1

  2. 2.

    Which substance is commonly used by farmers to neutralize acidic soil due to its basic properties?

    A.

    Sodium chloride (NaClNaCl)

    B.

    Calcium oxide (CaOCaO)

    C.

    Ammonium sulfate ((NH4)2SO4(NH_4)_2SO_4)

    D.

    Potassium nitrate (KNO3KNO_3)

  3. 3.

    What are the products formed when dilute sulfuric acid (H2SO4H_2SO_4) reacts with magnesium ribbon?

    A.

    Magnesium sulfate and hydrogen gas

    B.

    Magnesium oxide and water

    C.

    Magnesium sulfate and water

    D.

    Magnesium sulfide and oxygen gas

Download the worksheet for Acids, Bases and Salts - Properties of acids and bases to practice offline. It includes additional chapter-level practice questions.

Types of oxides

Subtopic

Types of oxides under Acids, Bases and Salts for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which element from Period 3 of the Periodic Table forms an oxide that dissolves in water to produce a solution with a pH greater than 7?

    A.

    Sodium

    B.

    Silicon

    C.

    Sulfur

    D.

    Chlorine

  2. 2.

    Some oxides do not react with either acids or bases. Which of the following is an example of such a 'neutral' oxide?

    A.

    Carbon monoxide, COCO

    B.

    Calcium oxide, CaOCaO

    C.

    Silicon dioxide, SiO2SiO_{2}

    D.

    Zinc oxide, ZnOZnO

  3. 3.

    Which type of oxide is formed when a non-metal, such as phosphorus, burns in a phosphorus-rich environment?

    A.

    Basic oxide

    B.

    Amphoteric oxide

    C.

    Acidic oxide

    D.

    Neutral oxide

Download the worksheet for Acids, Bases and Salts - Types of oxides to practice offline. It includes additional chapter-level practice questions.

Preparation of soluble and insoluble salts

Subtopic

Preparation of soluble and insoluble salts under Acids, Bases and Salts for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following salts is insoluble in water?

    A.

    Ammonium phosphate

    B.

    Potassium carbonate

    C.

    Silver nitrate

    D.

    Calcium sulfate

  2. 2.

    A student follows a sequence of steps to obtain dry crystals of a soluble salt from a solution. What is the correct order of these steps?

    A.

    Filter →\rightarrow Evaporate to dryness →\rightarrow Cool →\rightarrow Wash

    B.

    Evaporate to point of crystallization →\rightarrow Cool →\rightarrow Filter →\rightarrow Dry crystals between filter papers

    C.

    Cool →\rightarrow Filter →\rightarrow Evaporate to point of crystallization →\rightarrow Dry in oven

    D.

    Evaporate to dryness →\rightarrow Filter →\rightarrow Wash →\rightarrow Cool

  3. 3.

    When preparing copper(II) sulfate crystals from copper(II) oxide and sulfuric acid, why is the copper(II) oxide added in excess?

    A.

    To ensure that all of the acid has been neutralized

    B.

    To speed up the rate of the chemical reaction

    C.

    To increase the size of the crystals formed

    D.

    To act as a catalyst for the crystallization process

Download the worksheet for Acids, Bases and Salts - Preparation of soluble and insoluble salts to practice offline. It includes additional chapter-level practice questions.

Identification of ions and gases (Qualitative analysis)

Subtopic

Identification of ions and gases (Qualitative analysis) under Acids, Bases and Salts for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    To test for the presence of chloride ions (Cl−Cl^{-}), which set of reagents should be added to the aqueous sample?

    A.

    Aqueous barium nitrate and dilute nitric acid

    B.

    Aqueous sodium hydroxide and aluminum foil

    C.

    Aqueous silver nitrate and dilute nitric acid

    D.

    Dilute hydrochloric acid and limewater

  2. 2.

    When aqueous sodium hydroxide is added to a solution containing unknown cations, a light blue precipitate is formed. Which ion is responsible for this observation?

    A.

    Iron(II) (Fe2+Fe^{2+})

    B.

    Iron(III) (Fe3+Fe^{3+})

    C.

    Copper(II) (Cu2+Cu^{2+})

    D.

    Chromium(III) (Cr3+Cr^{3+})

  3. 3.

    Which gas turns damp blue litmus paper red and then bleaches it white?

    A.

    Ammonia (NH3NH_3)

    B.

    Chlorine (Cl2Cl_2)

    C.

    Sulfur dioxide (SO2SO_2)

    D.

    Carbon dioxide (CO2CO_2)

Download the worksheet for Acids, Bases and Salts - Identification of ions and gases (Qualitative analysis) to practice offline. It includes additional chapter-level practice questions.

Acids, Bases and Salts - Grade 11 Chemistry (IGCSE) | Krit.club