-by Pre Empower Oct 4 : Daily Quiz for Civil Services Prelims Examination
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Welcome to Pre Empower, your daily destination for mastering multiple-choice questions (MCQs) framed for Civil Services Examinations. Each day, we present a diverse set of carefully crafted MCQs to enhance your knowledge, boost your confidence, and prepare you for success in your civil services examinations of UPSC CSE and other State PCS like APSC, BPSC, UPPCS and others.
Questions have been designed as per the demands of examination that cover a wide range of topics, including General Studies, Current Affairs, and Aptitude for CSAT. With Pre Empower, you’ll not only test your understanding but also develop critical thinking skills essential for tackling the challenges of the Preliminary exam in the best possible manner.
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Question 1 of 5
1. Question
Which of the following acids is NOT a mineral acid?
(i) Hydrochloric acid
(ii) Sulfuric acid
(iii) Citric acid
(iv) Nitric acid
Select the correct answer:Correct
Answer: Option C
Explanation: Mineral acids are inorganic acids derived from minerals. Examples include hydrochloric acid (HCl), sulfuric acid (H₂SO₄), and nitric acid (HNO₃). Citric acid, however, is an organic acid, which is found naturally in citrus fruits like lemons and oranges. It is not a mineral acid because it is not derived from minerals but from plant sources.Incorrect
Answer: Option C
Explanation: Mineral acids are inorganic acids derived from minerals. Examples include hydrochloric acid (HCl), sulfuric acid (H₂SO₄), and nitric acid (HNO₃). Citric acid, however, is an organic acid, which is found naturally in citrus fruits like lemons and oranges. It is not a mineral acid because it is not derived from minerals but from plant sources. -
Question 2 of 5
2. Question
Which of the following statements is correct about metals?
(i) Metals are good conductors of electricity.
(ii) Metals are generally ductile.
(iii) Metals form acidic oxides.
(iv) Metals are malleable.Correct
Answer: Option A
Explanation: Metals are characterized by properties such as good electrical conductivity due to the presence of free electrons, which allows the easy flow of electric current (statement i). They are generally ductile, meaning they can be stretched into wires without breaking (statement ii). Metals are also malleable, which means they can be hammered into thin sheets (statement iv). Most metals form basic oxides, such as magnesium oxide (MgO), when they react with oxygen, not acidic oxides, making statement (iii) incorrect.Incorrect
Answer: Option A
Explanation: Metals are characterized by properties such as good electrical conductivity due to the presence of free electrons, which allows the easy flow of electric current (statement i). They are generally ductile, meaning they can be stretched into wires without breaking (statement ii). Metals are also malleable, which means they can be hammered into thin sheets (statement iv). Most metals form basic oxides, such as magnesium oxide (MgO), when they react with oxygen, not acidic oxides, making statement (iii) incorrect. -
Question 3 of 5
3. Question
The pH value of pure water at 25°C is:
Correct
Answer: Option C
Explanation: The pH value measures the hydrogen ion concentration in a solution. Pure water at 25°C is neutral, meaning it has an equal concentration of hydrogen ions (H⁺) and hydroxide ions (OH⁻). The pH value for a neutral solution is 7. Values below 7 indicate acidity, while values above 7 indicate basicity. Thus, the pH of pure water is 7.Incorrect
Answer: Option C
Explanation: The pH value measures the hydrogen ion concentration in a solution. Pure water at 25°C is neutral, meaning it has an equal concentration of hydrogen ions (H⁺) and hydroxide ions (OH⁻). The pH value for a neutral solution is 7. Values below 7 indicate acidity, while values above 7 indicate basicity. Thus, the pH of pure water is 7. -
Question 4 of 5
4. Question
Which of the following is an example of a double displacement reaction?
(i) NaCl + AgNO₃ → AgCl + NaNO₃
(ii) H₂ + Cl₂ → 2HCl
(iii) Fe + CuSO₄ → FeSO₄ + Cu
(iv) CaCO₃ → CaO + CO₂
Select the correct answer:Correct
Answer: Option A
Explanation: A double displacement reaction involves the exchange of ions between two compounds to form new compounds. In reaction (i), NaCl and AgNO₃ exchange their ions, resulting in the formation of AgCl and NaNO₃. This is a classic example of a double displacement reaction. Reaction (ii) is a combination reaction, (iii) is a displacement reaction, and (iv) is a decomposition reaction.Incorrect
Answer: Option A
Explanation: A double displacement reaction involves the exchange of ions between two compounds to form new compounds. In reaction (i), NaCl and AgNO₃ exchange their ions, resulting in the formation of AgCl and NaNO₃. This is a classic example of a double displacement reaction. Reaction (ii) is a combination reaction, (iii) is a displacement reaction, and (iv) is a decomposition reaction. -
Question 5 of 5
5. Question
Which of the following substances can act as an oxidizing agent?
(i) O₂
(ii) H₂O₂
(iii) H₂
(iv) Cl₂
Select the correct answer:Correct
Answer: Option A
Explanation: An oxidizing agent is a substance that can accept electrons and, in doing so, oxidizes another substance. Oxygen (O₂), hydrogen peroxide (H₂O₂), and chlorine (Cl₂) are all strong oxidizing agents that readily accept electrons during chemical reactions. Hydrogen (H₂), however, is typically a reducing agent because it tends to donate electrons, thus reducing other substances. Therefore, substances (i), (ii), and (iv) can all act as oxidizing agents.Incorrect
Answer: Option A
Explanation: An oxidizing agent is a substance that can accept electrons and, in doing so, oxidizes another substance. Oxygen (O₂), hydrogen peroxide (H₂O₂), and chlorine (Cl₂) are all strong oxidizing agents that readily accept electrons during chemical reactions. Hydrogen (H₂), however, is typically a reducing agent because it tends to donate electrons, thus reducing other substances. Therefore, substances (i), (ii), and (iv) can all act as oxidizing agents.
