10 Sci – Acids, Bases and Salts – Test (FREE MCQ Test)
1 / 30
What reagent is used to test for the presence of CO₂ gas?
CO₂ gas is tested using lime water.
2 / 30
Washing Soda is chemically Sodium Carbonate Decahydrate. What is its chemical formula?
Washing Soda is Na₂CO₃·10H₂O.
3 / 30
Which of the following is listed as a primary use of Bleaching Powder?
Uses listed include bleaching textiles/paper, acting as an oxidizing agent, and disinfecting water.
4 / 30
Tooth decay begins when the pH of the mouth drops below what specific value?
Tooth decay starts when the mouth’s pH is less than 5.5, which damages tooth enamel.
5 / 30
The process used to manufacture Sodium Hydroxide (NaOH) from common salt (NaCl) is known as the:
Sodium Hydroxide is prepared through the Chlor-Alkali process.
6 / 30
Which type of acid produces fewer H⁺ ions in an aqueous solution?
Weak acids, such as CH₃COOH, produce fewer H⁺ ions compared to strong acids like HCl or H₂SO₄.
7 / 30
Which compound is primarily used for setting fractured bones?
Plaster of Paris (POP) is used for setting fractured bones.
8 / 30
Non-metallic oxides are characterized by their reaction with bases to form salt and water, meaning they behave as what type of oxide?
Non-metallic oxides behave as acidic oxides since they react with bases to produce salt and water (e.g., CO₂ + Ca(OH)₂).
9 / 30
A salt formed from the reaction of a strong acid and a strong base will result in a solution that is:
The salt formed from a strong acid and strong base is neutral.
10 / 30
If the pH of rain water falls below 5.6, it is referred to as:
Acid rain is defined by a pH value less than 5.6, which affects aquatic life.
11 / 30
What happens to HCl when it is dissolved in water?
HCl gas ionises in water to form hydronium ions (H₃O⁺) and Cl⁻ ions.
12 / 30
What term is used to describe the reaction: Acid + Base → Salt + Water?
This is the definition of a neutralisation reaction.
13 / 30
What precaution must be taken because the process of dissolving an acid or base in water is highly exothermic?
Because the process is exothermic, acid must always be added slowly to water, and never water to the concentrated acid.
14 / 30
The reaction of a metal carbonate (Na₂CO₃) with an acid produces salt, water, and which gas?
Metal carbonates and hydrogencarbonates react with acids to yield salt, CO₂, and water.
15 / 30
Which term describes bases that are soluble in water?
Bases that are soluble in water are specifically called alkalis.
16 / 30
How do metallic oxides generally behave in chemical reactions with acids?
Metallic oxides react with acids to form salt and water, indicating they behave as basic oxides.
17 / 30
What is the role of hydrochloric acid (HCl) in the human digestive system?
The digestive system uses HCl; antacids are used to neutralize excess acid.
18 / 30
What type of gas is produced when an acid reacts with an active metal?
Acids react with metals to form a salt and hydrogen gas (H₂).
19 / 30
Which chemical compound decomposes upon heating to yield Na₂CO₃, CO₂, and H₂O?
Baking Soda (NaHCO₃) decomposes when heated to yield Sodium Carbonate (Na₂CO₃), CO₂, and H₂O.
20 / 30
Salts that share the same positive or negative radicals belong to the same:
Salts having the same positive or negative radicals (e.g., NaCl and Na₂SO₄ share Na⁺) are considered to belong to the same family.
21 / 30
Which of the following indicators is classified as an olfactory indicator?
Olfactory indicators are those substances whose smell changes in acidic or basic media. The sources list onion, vanilla, and clove as olfactory indicators.
22 / 30
A bee sting injects methanoic acid, which can be neutralized by applying a mild base such as:
The methanoic acid from stings can be neutralized by applying mild bases like baking soda.
23 / 30
Which test is specifically used for the observation of hydrogen gas in a laboratory setting?
The presence of hydrogen gas evolved from the reaction of acids with metals is confirmed through the soap bubble test.
24 / 30
What chemical is prepared by reacting Cl₂ gas, obtained from the Chlor-Alkali process, with slaked lime?
Bleaching Powder (Ca(ClO)₂) is prepared by reacting Cl₂ with slaked lime (Ca(OH)₂).
25 / 30
The fixed number of water molecules present in one formula unit of a salt is known as the:
This is the definition of water of crystallisation.
26 / 30
What value on the pH scale indicates a basic solution?
The pH scale ranges from 0 to 14. A pH > 7 indicates a basic solution.
27 / 30
What is the primary purpose of the dilution process for acids and bases?
Dilution reduces the concentration of H⁺ or OH⁻ ions per unit volume.
28 / 30
Why does dry HCl gas not exhibit acidic properties?
Acids and bases ionise only in aqueous solution; dry HCl gas requires water to produce the H⁺ ions necessary for acidity.
29 / 30
Plaster of Paris (CaSO₄·½H₂O) is derived by heating which mineral?
Plaster of Paris is derived by heating gypsum (CaSO₄·2H₂O).
30 / 30
What is the expected nature of a salt solution formed from a weak acid and a strong base?
Weak acid + strong base yields a basic salt.
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