Chemical Compound And Natural Color Trivia Quiz
Questions and Answers
- 1.
What color of precipitate confirms Pb++
- A.
Yellow
- B.
Black
- C.
Orange
- D.
White
Correct Answer
A. YellowExplanation
The color yellow indicates the presence of lead ions (Pb++) in a solution. When a yellow precipitate forms, it confirms the presence of lead ions. This is a common test used to identify the presence of lead in various chemical reactions.Rate this question:
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- 2.
What color of precipitate confirms Hg2++
- A.
Yellow
- B.
Black
- C.
Orange
- D.
White
Correct Answer
D. WhiteExplanation
Black precipitate indicates presence of Hg2++ but white precipitate confirms its presenceRate this question:
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- 3.
What color of precipitate confirms Ag+
- A.
Yellow
- B.
Black
- C.
Orange
- D.
White
Correct Answer
D. WhiteExplanation
When a white precipitate forms, it confirms the presence of Ag+ ions. This is because the compound silver chloride (AgCl) is a white precipitate. When Ag+ ions react with chloride ions (Cl-) in a solution, they form insoluble silver chloride, which appears as a white solid. Therefore, the formation of a white precipitate indicates the presence of Ag+ ions.Rate this question:
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- 4.
What color of precipitate indicates the presence of Hg++
- A.
Yellow
- B.
Black
- C.
Orange
- D.
White
Correct Answer
D. WhiteExplanation
When a white precipitate forms, it indicates the presence of Hg++ ions. The formation of a white precipitate occurs due to the reaction between Hg++ ions and certain reagents, such as chloride ions or sulfur ions. This reaction leads to the formation of an insoluble compound, which appears as a white solid. Therefore, the presence of a white precipitate is a characteristic reaction for detecting the presence of Hg++ ions.Rate this question:
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- 5.
What color of precipitate indicates the presence of Pb++ centrifuge
- A.
Yellow
- B.
Black
- C.
Orange
- D.
White
Correct Answer
D. WhiteExplanation
The color of the precipitate that indicates the presence of Pb++ in a centrifuge is white.Rate this question:
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- 6.
What color of precipitate indicates the presence of Bi+++ centrifuge
- A.
Yellow
- B.
Black
- C.
Orange
- D.
White
Correct Answer
D. WhiteExplanation
The color of precipitate that indicates the presence of Bi+++ centrifuge is white. This suggests that when Bi+++ ions are present in a solution and a centrifuge is applied, a white solid substance will form.Rate this question:
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- 7.
What color of precipitate indicates the presence of Bi+++ centrifuge
- A.
Yellow
- B.
Black
- C.
Orange
- D.
White
Correct Answer
D. WhiteExplanation
White indicates presence of Bi+++ centrifuge while white ppt. confirms it.Rate this question:
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- 8.
What color of precipitate confirms the presence of Bi+++
- A.
Yellow
- B.
Black
- C.
Orange
- D.
White
Correct Answer
B. BlackExplanation
White indicates presence of Bi+++ centrifuge while white ppt. confirms it.Rate this question:
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- 9.
What color of precipitate confirms the presence of Cd++
- A.
Yellow
- B.
Black
- C.
Orange
- D.
White
Correct Answer
A. YellowExplanation
When a yellow precipitate is formed, it confirms the presence of Cd++ ions. This is because certain compounds of cadmium, such as cadmium sulfide (CdS), are yellow in color and can form a precipitate when Cd++ ions react with suitable reagents. Therefore, the formation of a yellow precipitate indicates the presence of Cd++ ions in the solution.Rate this question:
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- 10.
What color of precipitate confirms the presence of Cu++ (acidify)
- A.
Yellow
- B.
Black
- C.
Red
- D.
White
Correct Answer
C. RedExplanation
The color red confirms the presence of Cu++ ions when the solution is acidified. This is because when Cu++ ions react with acid, they form a complex called cupric ion (Cu2+), which has a red color. Therefore, the presence of a red precipitate indicates the presence of Cu++ ions in the solution.Rate this question:
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- 11.
What color of solution confirms the presence of Cu++
- A.
Yellow
- B.
Black
- C.
Red
- D.
Deep Blue
Correct Answer
D. Deep BlueExplanation
A deep blue color of solution confirms the presence of Cu++. This is because Cu++ ions have a characteristic deep blue color when they are in solution. Therefore, if the solution turns deep blue, it indicates the presence of Cu++ ions.Rate this question:
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- 12.
What color of precipitate confirms the presence of As+3
- A.
Yellow
- B.
Black
- C.
Red
- D.
Deep Blue
Correct Answer
A. YellowExplanation
The color yellow confirms the presence of As+3 because when As+3 reacts with certain reagents, such as ammonium molybdate or silver nitrate, a yellow precipitate is formed. This is a characteristic reaction of arsenic in its +3 oxidation state. The formation of a yellow precipitate indicates the presence of As+3 in the solution.Rate this question:
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- 13.
What color of precipitate confirms the presence of Sb+3
- A.
Yellow
- B.
Black
- C.
Orange
- D.
Deep Blue
Correct Answer
C. OrangeExplanation
The color orange confirms the presence of Sb+3.Rate this question:
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- 14.
What color of precipitate confirms the presence of Sn++
- A.
Yellow
- B.
Black
- C.
Orange
- D.
White or gray
Correct Answer
D. White or grayExplanation
The color of precipitate that confirms the presence of Sn++ is white or gray. This is because when Sn++ ions react with certain reagents, such as ammonium sulfide or hydrogen sulfide, they form insoluble compounds that appear as white or gray precipitates. This color change is a characteristic reaction of Sn++ ions and can be used to identify their presence in a solution.Rate this question:
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- 15.
What color of flame confirms the presence of Na+
- A.
Intense Yellow
- B.
Black
- C.
Orange
- D.
White or gray
Correct Answer
A. Intense YellowExplanation
The intense yellow color of a flame confirms the presence of Na+. When sodium ions are heated, they emit a characteristic yellow light. This is due to the excitation of electrons in the sodium atoms, followed by their subsequent relaxation to lower energy levels, releasing energy in the form of visible light. Therefore, the intense yellow color of the flame is a clear indication of the presence of sodium ions.Rate this question:
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- 16.
What color of flame confirms the presence of K+
- A.
Yellow
- B.
Black
- C.
Orange
- D.
Reddish violet
Correct Answer
D. Reddish violetExplanation
The color of flame that confirms the presence of K+ is reddish violet. This is because when potassium ions are heated, they emit a characteristic reddish violet color. This color is distinct and can be used to identify the presence of potassium ions in a compound or solution.Rate this question:
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- 17.
What color of precipitate confirms the presence of K+
- A.
Yellow
- B.
Black
- C.
Orange
- D.
Reddish violet
Correct Answer
A. YellowExplanation
A yellow precipitate confirms the presence of K+. This is because when K+ ions react with certain compounds, such as chromate or dichromate ions, they form a yellow precipitate. This reaction is commonly used as a test for the presence of potassium ions in chemical analysis.Rate this question:
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- 18.
Does turning of red litmus paper into blue indicates the presence of NH4+?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
When red litmus paper turns blue, it indicates a basic or alkaline solution. This is because red litmus paper is red in acidic solutions and blue in basic solutions. The presence of NH4+ ions, which is the ammonium ion, can cause a solution to become basic. Therefore, if red litmus paper turns blue, it suggests the presence of NH4+ ions.Rate this question:
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- 19.
What do we use to confirm in flame test?
- A.
Back of the test tube brush
- B.
Nichrome wire
Correct Answer
B. Nichrome wireExplanation
We only used back of the test tube brush as an substitution due to the lack of nichrome wire.Rate this question:
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Current Version
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Sep 26, 2024Quiz Edited by
ProProfs Editorial Team -
Dec 18, 2014Quiz Created by
Catherine Halcomb
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