Standard Grade Chemistry Acids And Alkalis
Explore the fundamentals of acids and alkalis, including their chemical properties, formulas, and reactions. Understand concepts like hydrogen ion charge, the role of hydroxide ions, and practical examples such as vinegar and ammonia.
- 1.
Which of the following has the chemical formula H2SO4
- A.
Carbonic acid
- B.
Carbon dioxide
- C.
Sulphur dioxide
- D.
Sulphuric acid
- E.
Sulphur carbonate
Correct Answer
D. Sulphuric acidExplanation
Sulphuric acid has the chemical formula H2SO4. It is a strong acid that is commonly used in various industrial processes such as the production of fertilizers, dyes, and detergents. It is also used in laboratories and as a laboratory reagent. The chemical formula H2SO4 indicates that each molecule of sulphuric acid contains two hydrogen atoms, one sulphur atom, and four oxygen atoms.Rate this question:
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- 2.
What type of chemical contains hydroxide ions?
- A.
Acid
- B.
Alkali
- C.
Carbonate
- D.
Oxide
- E.
Ammonium
Correct Answer
B. AlkaliExplanation
An alkali is a type of chemical that contains hydroxide ions. Hydroxide ions have a negative charge and consist of one oxygen atom bonded to one hydrogen atom. Alkalis are known for their ability to neutralize acids and have a pH value greater than 7. They are commonly found in household cleaning products and are often used in industries such as agriculture, manufacturing, and water treatment.Rate this question:
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- 3.
What is the charge of hydrogen ions in acids?
- A.
Negative
- B.
Positive
- C.
Neutral
- D.
No charge
- E.
Alternating current
Correct Answer
B. PositiveExplanation
Hydrogen ions in acids have a positive charge. When an acid dissolves in water, it releases hydrogen ions (H+), which are positively charged. These hydrogen ions are responsible for the acidic properties of the solution, as they can donate a proton to other substances. Therefore, the correct answer is positive.Rate this question:
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- 4.
What is a mole?
- A.
Gram formula mass
- B.
A compound with the same chemical formula, but a different structural formula
- C.
A family of hydrocarbons with a general formula and similar properties
- D.
Unit of concentration
- E.
Unit of measurement for liquids
Correct Answer
A. Gram formula massExplanation
A mole is a unit of measurement used in chemistry to express the amount of a substance. It is defined as the amount of a substance that contains the same number of particles (atoms, molecules, or ions) as there are in 12 grams of carbon-12. The gram formula mass refers to the mass of one mole of a compound, which is calculated by adding up the atomic masses of all the atoms in its chemical formula. Therefore, the gram formula mass is a correct explanation for what a mole is.Rate this question:
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- 5.
Which is the acid?
- A.
Lye
- B.
Vinegar
- C.
Amylase
- D.
Fructose
- E.
Starch
Correct Answer
B. VinegarExplanation
Vinegar is the correct answer because it is an acidic substance. It is made through a fermentation process that converts ethanol into acetic acid. Vinegar has a sour taste and is commonly used in cooking and as a cleaning agent. Lye, amylase, fructose, and starch are not acids.Rate this question:
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- 6.
Name the only gas which dissolves to give an alkali solution?
- A.
Carbon dioxide
- B.
Sulphur dioxide
- C.
Ammonia
- D.
Nitrogen dioxide
- E.
Carbon monoxide
Correct Answer
C. AmmoniaExplanation
Ammonia is the only gas among the options that dissolves to give an alkali solution. When ammonia gas dissolves in water, it forms ammonium hydroxide, which is a strong base and gives an alkaline solution. Carbon dioxide, sulphur dioxide, nitrogen dioxide, and carbon monoxide do not dissolve to form alkali solutions.Rate this question:
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Nov 01, 2024Quiz Edited by
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Mar 11, 2009Quiz Created by
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