10 - Science - 11. Chemistry – Chemical Reactions
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Prepared By Mr. S. Ravikumar, B. T. Asst., GHS, Arangaldhurgam, Vellore District. ; &nbs p; & www. Padasalai. Net
Questions and Answers
- 1.
Zn + 2HCl → ZnCl2 + H2 ↑ The above reaction is an example of _________
- A.
Combination reaction
- B.
Double displacement reaction
- C.
Displacement reaction
- D.
Decomposition reaction
Correct Answer
C. Displacement reactionExplanation
The given reaction involves the displacement of hydrogen from hydrochloric acid by zinc. This is evident from the formation of zinc chloride and the evolution of hydrogen gas. Therefore, the reaction is an example of a displacement reaction.Rate this question:
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- 2.
A reddish brown coloured element ‘X’ on heating in air becomes black coloured compound ‘Y’. X and Y are______ and ________
- A.
Cu, CuO
- B.
Pb, PbO
Correct Answer
A. Cu, CuOExplanation
When the reddish brown element X is heated in air, it forms a black compound Y. The correct answer is Cu, CuO because copper (Cu) is a reddish brown element and when it is heated in air, it reacts with oxygen to form copper oxide (CuO), which is a black compound.Rate this question:
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- 3.
A student tested the pH of pure water using a pH paper. It showed green colour. If a pH paper is used after adding lemon juice into water, what color will he observe?
- A.
Green
- B.
Red
- C.
Yellow
Correct Answer
B. RedExplanation
When a pH paper shows a green color, it indicates that the solution is neutral, which is the case with pure water. Lemon juice, on the other hand, is acidic in nature. Therefore, when the student adds lemon juice to the water and tests it with the pH paper, he will observe a red color. This is because the pH paper will indicate that the solution is acidic, and red is the color associated with acidic solutions on pH papers.Rate this question:
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- 4.
Chemical volcano is an example of _____________
- A.
Combination reaction
- B.
Decomposition reaction
Correct Answer
B. Decomposition reactionExplanation
A chemical volcano is an example of a decomposition reaction. In a decomposition reaction, a single compound breaks down into two or more simpler substances. In the case of a chemical volcano, a mixture of chemicals react to produce a gas, which causes the eruption and the release of heat and smoke. This reaction involves the decomposition of the chemicals present in the volcano mixture, resulting in the formation of new substances and the release of energy.Rate this question:
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- 5.
When crystals of lead nitrate on heating strongly produces a ____ (NO2 / CO2) gas and the colour of the gas is _________ (reddish brown/ white)
- A.
NO2, reddish brown
- B.
CO2, reddish brown
- C.
NO2, white
- D.
CO2, white
Correct Answer
A. NO2, reddish brownExplanation
When crystals of lead nitrate are heated strongly, they undergo decomposition and produce NO2 gas. NO2 gas is reddish brown in color, hence the color of the gas is reddish brown.Rate this question:
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- 6.
When aqueous solution of silver nitrate and sodium chloride are mixed _______ precipitate is immediately formed. (white / yellow / red)
- A.
White
- B.
Yellow
- C.
Red
Correct Answer
A. WhiteExplanation
When aqueous solutions of silver nitrate and sodium chloride are mixed, a white precipitate is immediately formed. This is because silver nitrate and sodium chloride react to form silver chloride, which is insoluble in water and therefore precipitates out. The white color of the precipitate is due to the presence of silver chloride.Rate this question:
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- 7.
Zinc can displace aluminium metal from aqueous solution of aluminium sulphate.
- A.
Zinc is more reactive than aluminium
- B.
Aluminium is more reactive than zinc
Correct Answer
A. Zinc is more reactive than aluminiumExplanation
Zinc is more reactive than aluminium. This means that zinc has a higher tendency to undergo a chemical reaction compared to aluminium. In this case, zinc can displace aluminium metal from an aqueous solution of aluminium sulphate. This displacement reaction occurs because zinc can easily react with the sulphate ions in the solution, causing the aluminium metal to be displaced and forming zinc sulphate.Rate this question:
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- 8.
To protect tooth decay, we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is ______ in nature.
- A.
Acidic
- B.
Basic
Correct Answer
B. BasicExplanation
To protect tooth decay, we are advised to brush our teeth regularly. The toothpaste commonly used is basic in nature. This is because basic toothpaste helps to neutralize the acidic environment in the mouth, which is caused by the bacteria that feed on sugars and produce acids. By using a basic toothpaste, it helps to balance the pH level in the mouth and prevent tooth decay.Rate this question:
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- 9.
Vinegar is present in acetic acid. Curd contains _____ acid.
- A.
Lactic acid
- B.
Tartaric acid
Correct Answer
A. Lactic acidExplanation
Curd contains lactic acid. This is because lactic acid is a byproduct of the fermentation process that occurs when bacteria break down lactose, the sugar found in milk. As curd is made from milk, it naturally contains lactic acid.Rate this question:
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- 10.
PH = - log10 [H+]. The pH of a solution containing hydrogen ion concentration of 0.001M solution is _____
- A.
3
- B.
11
- C.
14
Correct Answer
A. 3Explanation
The pH of a solution is determined by the concentration of hydrogen ions (H+). The pH scale is logarithmic, meaning that each unit represents a tenfold difference in acidity or alkalinity. In this case, the given hydrogen ion concentration is 0.001M, which is a relatively low concentration. Taking the negative logarithm of 0.001 gives a pH of 3, indicating that the solution is acidic.Rate this question:
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Mar 21, 2023Quiz Edited by
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Dec 02, 2013Quiz Created by
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