Chemistry Ix Chapter 7 MCQs
Questions and Answers
- 1.
In which of the following changes the nitrogen atom is reduced?
- A.
N2 to NO
- B.
N2 to NO2
- C.
N2 to NH3
- D.
N2 to HNO3
Correct Answer
C. N2 to NH3Explanation
The correct answer is N2 to NH3. In this reaction, nitrogen gas (N2) is reduced to ammonia (NH3). Reduction is a chemical reaction that involves the gain of electrons or a decrease in oxidation state. In this case, the nitrogen atom in N2 gains three hydrogen atoms, resulting in a decrease in its oxidation state from 0 to -3. Therefore, the nitrogen atom is reduced in the conversion of N2 to NH3.Rate this question:
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- 2.
Which of the following reaction is an example of oxidation?
- A.
Chlorine molecule to chloride ion
- B.
Silver atom tosilver (I) iron
- C.
Oxygen molecule to oxide ion
- D.
Iron (III) ion to iron (II) ion
Correct Answer
B. Silver atom tosilver (I) ironExplanation
The reaction "Silver atom to silver (I) iron" is an example of oxidation because silver is losing electrons and increasing its oxidation state from 0 to +1. In this reaction, the silver atom is being oxidized to form a silver ion with a +1 charge.Rate this question:
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- 3.
Which of the following element in the given reaction is reduced? Zn + H2 ---------------> Zn + H2O
- A.
H2
- B.
ZnO
- C.
Zn
- D.
O
Correct Answer
C. ZnExplanation
In the given reaction, Zn (Zinc) is reduced. This is because reduction involves the gain of electrons, and in this reaction, Zn goes from being in its elemental form (Zn) to being in a compound form (ZnO). This indicates that Zn has gained oxygen and therefore electrons, making it the element that is reduced in the reaction.Rate this question:
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- 4.
Consider the following reaction H2S + Cl2 -----------------> 2HCl in this reaction how H2S behave as?
- A.
Reducing agent
- B.
Oxidizing agent
- C.
Catalyst
- D.
Electrolyte
Correct Answer
A. Reducing agentExplanation
In the given reaction, H2S is behaving as a reducing agent. This is because it is being oxidized (losing electrons) while Cl2 is being reduced (gaining electrons). A reducing agent is a substance that donates electrons to another substance, causing it to be reduced. In this reaction, H2S is donating electrons to Cl2, which results in the formation of HCl. Therefore, H2S is acting as a reducing agent in this reaction.Rate this question:
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- 5.
The oxidation state of Cr in K2Cr2O7 is?
- A.
12
- B.
6
- C.
3
- D.
Zero
Correct Answer
B. 6Explanation
The oxidation state of Cr in K2Cr2O7 is 6 because each oxygen atom has an oxidation state of -2, and each potassium atom has an oxidation state of +1. Since the overall charge of K2Cr2O7 is 0, the sum of the oxidation states of all the atoms must equal 0. Therefore, the oxidation state of Cr can be calculated as follows: 2(+1) + 2(6) + 7(-2) = 0. This equation simplifies to 2 + 12 - 14 = 0, which means the oxidation state of Cr is 6.Rate this question:
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- 6.
Which of the following statement is not correct about the Galvanic cell?
- A.
Cadence are produced at cathode
- B.
A9 are oxidized at anode
- C.
Electrons flow from cathode to anode
- D.
Oxidation occurs at anode
Correct Answer
C. Electrons flow from cathode to anodeExplanation
The statement "Electrons flow from cathode to anode" is not correct about the Galvanic cell. In a Galvanic cell, electrons flow from the anode to the cathode. The anode is where oxidation occurs and electrons are released, while the cathode is where reduction occurs and electrons are gained. Therefore, the correct statement is that electrons flow from anode to cathode in a Galvanic cell.Rate this question:
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- 7.
Which of the following statement is not true about Danielle about Daniel cell
- A.
Half cell of an active metal x as cathode
- B.
Half cell contains an element in contact with its own ions in aqueous solution
- C.
ASR Bridge connects the two half cells
- D.
Spontaneous oxidation reduction reaction generates electricity
Correct Answer
A. Half cell of an active metal x as cathodeExplanation
The statement that is not true about the Daniell cell is that the half cell of an active metal x is the cathode. In a Daniell cell, the half cell of an active metal (such as zinc) is the anode, while the half cell containing an element in contact with its own ions in aqueous solution (such as copper) is the cathode. The ASR Bridge connects the two half cells, and a spontaneous oxidation-reduction reaction occurs, generating electricity.Rate this question:
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- 8.
Which of the following do not involve electrolytic process?
- A.
Refining of copper
- B.
Manufacturing of sodium from NaCl
- C.
Electroplating of Steel
- D.
Reduction of metal oxide by a reducing agent
Correct Answer
D. Reduction of metal oxide by a reducing agentExplanation
The electrolytic process involves the use of an electric current to cause a chemical reaction. Refining of copper, manufacturing of sodium from NaCl, and electroplating of steel all involve electrolytic processes. However, the reduction of metal oxide by a reducing agent does not involve the use of an electric current. Instead, it involves the use of a reducing agent to remove oxygen from the metal oxide, resulting in the reduction of the metal.Rate this question:
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- 9.
Galvanizing is?
- A.
Coating with Sn
- B.
Coating with Zn
- C.
Coating with Cr
- D.
Coating with Cu
Correct Answer
B. Coating with ZnExplanation
Galvanizing refers to the process of coating a metal surface with zinc. This is done to protect the metal from corrosion and rusting. Zinc acts as a sacrificial anode, meaning it corrodes preferentially to the metal underneath, thereby preventing the underlying metal from being exposed to the corrosive environment. Galvanizing is commonly used in industries such as construction, automotive, and manufacturing to increase the lifespan and durability of metal structures and products.Rate this question:
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- 10.
Which of the following is true for Nelson cell?
- A.
Sodium metal is produced at anode
- B.
Chlorine gas is produced at anode
- C.
Hydrogen gas is produced at anode
- D.
Sodium ions are reduced at cathode
Correct Answer
B. Chlorine gas is produced at anodeExplanation
In a Nelson cell, chlorine gas is produced at the anode. This is because the Nelson cell is an electrolytic cell used for the production of chlorine gas. The anode is the positive electrode where oxidation occurs, and in this case, it is the site where chloride ions are oxidized to produce chlorine gas. The other options are incorrect as they do not align with the purpose and functioning of a Nelson cell.Rate this question:
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Quiz: Test Your Knowledge of Ms. Doe's Chemistry Class!
Quiz: Test Your Knowledge of Ms. Doe's Chemistry Class!
Quiz: Which MBTI Type Are You According to Chemistry?
Quiz: Which MBTI Type Are You According to Chemistry?
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