Acids, Bases And Salts - SEC 4 Nt
Simple questions on acids, bases ans salts for Sec 4 NT level.
Questions and Answers
- 1.
What does this hazard symbol mean?
- A.
Corrosive
- B.
Irritant
- C.
Harmful
Correct Answer
A. CorrosiveExplanation
This hazard symbol indicates that the substance is corrosive. Corrosive substances can cause severe damage to skin, eyes, and other materials upon contact. They have the ability to eat away or destroy living tissue and can cause burns or other injuries.Rate this question:
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- 2.
Which of these acids is most likely to be dangerous?
- A.
Citric acid
- B.
Carbonic acid
- C.
Hydrochloric acid
Correct Answer
C. Hydrochloric acidExplanation
Hydrochloric acid is most likely to be dangerous because it is a strong acid that can cause severe burns and tissue damage upon contact. It is commonly used in laboratories and industrial settings, and even in small concentrations, it can be harmful to the skin, eyes, and respiratory system. Ingesting hydrochloric acid can also cause serious internal injuries and can be fatal. On the other hand, citric acid and carbonic acid are weak acids commonly found in food and beverages and are generally safe for consumption in normal quantities.Rate this question:
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- 3.
What happens to litmus paper in acidic solutions?
- A.
Red litmus turns blue
- B.
Blue litmus turns red
- C.
Yellow litmus turns green
Correct Answer
B. Blue litmus turns redExplanation
In acidic solutions, the blue litmus paper turns red. This is because litmus paper is a pH indicator that changes color depending on the acidity or alkalinity of a solution. Blue litmus paper is blue in neutral or basic solutions, but when it comes into contact with an acidic solution, it turns red. This color change occurs due to a chemical reaction between the litmus paper and the acidic solution, indicating the presence of acidity.Rate this question:
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- 4.
Universal indicator solution is usually green to begin with. What does this mean?
- A.
It is acidic
- B.
It is alkaline
- C.
It is neutral
Correct Answer
C. It is neutralExplanation
The fact that universal indicator solution is usually green to begin with suggests that it is neutral. Universal indicator is a mixture of several different indicators, and the green color indicates a pH level of around 7, which is considered neutral on the pH scale.Rate this question:
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- 5.
A liquid has a pH of 7.5 - what does this mean?
- A.
It is weakly acidic
- B.
It is weakly alkaline
- C.
It is neutral
Correct Answer
B. It is weakly alkalineExplanation
A pH of 7.5 indicates that the liquid is weakly alkaline. pH is a measure of the acidity or alkalinity of a substance, with values below 7 indicating acidity, 7 indicating neutrality, and values above 7 indicating alkalinity. Therefore, a pH of 7.5 suggests that the liquid is slightly alkaline, but still closer to neutral than strongly alkaline.Rate this question:
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- 6.
A liquid has a pH of 1 - what does this mean?
- A.
It must be sodium hydroxide solution
- B.
It is strongly acidic
- C.
It is weakly acidic
Correct Answer
B. It is strongly acidicExplanation
A pH of 1 indicates a high concentration of hydrogen ions in the liquid, making it strongly acidic. Sodium hydroxide solution would have a pH greater than 7, indicating it is alkaline rather than acidic. Therefore, the correct answer is that the liquid is strongly acidic.Rate this question:
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- 7.
What products are formed when a carbonate reacts with an acid?
- A.
A salt only
- B.
A salt and water
- C.
A salt, water and carbon dioxide
- D.
A salt and hydrogen
Correct Answer
C. A salt, water and carbon dioxideExplanation
When a carbonate reacts with an acid, it undergoes a chemical reaction called neutralization. In this reaction, the carbonate ion (CO3^2-) from the carbonate compound combines with the hydrogen ion (H+) from the acid to form water (H2O) and carbon dioxide (CO2). Additionally, the remaining ions from the acid and the carbonate form a salt. Therefore, the correct answer is that a carbonate reacts with an acid to form a salt, water, and carbon dioxide.Rate this question:
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- 8.
What products are formed when a metal reacts with an acid?
- A.
A salt and hydrogen
- B.
A salt, water and carbon dioxide
- C.
A salt and water
- D.
A salt only
Correct Answer
A. A salt and hydrogenExplanation
When a metal reacts with an acid, the metal displaces hydrogen from the acid to form hydrogen gas. At the same time, the metal combines with the non-hydrogen part of the acid to form a salt. Therefore, the products formed when a metal reacts with an acid are a salt and hydrogen.Rate this question:
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- 9.
Farmers use lime to neutralise their soils. What sort of substance is lime?
- A.
A base
- B.
An acid
- C.
A sharp tasting drink
Correct Answer
A. A baseExplanation
Lime is a base because it is used by farmers to neutralize acidic soils. Bases are substances that have a high pH level and can react with acids to form a salt and water. Lime, also known as calcium oxide or calcium hydroxide, can increase the pH level of soil by neutralizing the acidity, making it more suitable for plant growth.Rate this question:
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- 10.
Which gas is produced when magnesium reacts with hydrochloric acid?
- A.
Carbon dioxide
- B.
Oxygen
- C.
Hydrogen
- D.
Ammonia
Correct Answer
C. HydrogenExplanation
When magnesium reacts with hydrochloric acid, it undergoes a displacement reaction, where magnesium displaces hydrogen from the acid. This displacement reaction results in the production of hydrogen gas. Therefore, the correct answer is hydrogen.Rate this question:
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- 11.
Which gas is produced when calcium carbonate reacts with hydrochloric acid?
- A.
Oxygen
- B.
Hydrogen
- C.
Ammonia
- D.
Carbon dioxide
Correct Answer
D. Carbon dioxideExplanation
When calcium carbonate reacts with hydrochloric acid, it forms calcium chloride, water, and carbon dioxide. This is a classic example of a chemical reaction called a neutralization reaction. The carbon dioxide gas is produced as a result of the reaction between the calcium carbonate and the hydrochloric acid. Therefore, the correct answer is carbon dioxide.Rate this question:
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- 12.
Which gas is produced when ammonium nitrate reacts with sodium hydroxide?
- A.
Nitrogen
- B.
Hydrogen
- C.
Ammonia
- D.
Oxygen
Correct Answer
C. AmmoniaExplanation
When ammonium nitrate reacts with sodium hydroxide, it produces ammonia gas. This reaction is known as a neutralization reaction, where the ammonium ion (NH4+) from ammonium nitrate reacts with the hydroxide ion (OH-) from sodium hydroxide to form ammonia gas (NH3), water (H2O), and sodium nitrate (NaNO3). Therefore, the correct answer is ammonia.Rate this question:
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- 13.
Neutralisation is the process in which
- A.
Acid react with salt
- B.
Alkali react with water
- C.
Acid react with alkali
- D.
Alkali react with base
Correct Answer
C. Acid react with alkaliExplanation
Neutralisation is a chemical reaction in which an acid reacts with an alkali to form a salt and water. This reaction occurs when the hydrogen ions (H+) from the acid combine with the hydroxide ions (OH-) from the alkali to form water (H2O). The remaining ions from the acid and alkali combine to form a salt. Therefore, the given answer "acid react with alkali" is correct.Rate this question:
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- 14.
When unknown substance X react with acid, it release a gas which produces a "pop" sound with a burning splint. What type of substance does X belongs to?
- A.
Alkali
- B.
Carbonate
- C.
Ammonium salts
- D.
Metal
Correct Answer
D. MetalExplanation
The correct answer is metal because metals have the ability to react with acid to release hydrogen gas. This gas can ignite with a burning splint, producing a "pop" sound.Rate this question:
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- 15.
When unknown substance Y react with acid, it release a gas which turns limewater chalky. What is the gas produced?
- A.
Oxygen
- B.
Hydrogen
- C.
Ammonia
- D.
Carbon dioxide
Correct Answer
D. Carbon dioxideExplanation
When substance Y reacts with acid, it produces a gas that turns limewater chalky. This indicates the presence of carbon dioxide.Rate this question:
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Mar 17, 2023Quiz Edited by
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Apr 21, 2010Quiz Created by
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