-by Pre Empower Oct 3 : 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 metals is used as a catalyst in the Haber process for the synthesis of ammonia?
(i) Iron
(ii) Copper
(iii) Platinum
(iv) Nickel
Select the correct option:Correct
Answer: Option A
Explanation: The Haber process is an industrial method used for the synthesis of ammonia from nitrogen and hydrogen gases. Iron is used as a catalyst because it facilitates the breaking of nitrogen’s triple bond, which is one of the strongest bonds in chemistry, and thus accelerates the reaction. The catalyst is also promoted with small amounts of other substances like potassium and aluminum oxide to enhance its efficiency. Copper and platinum are not used in the Haber process as they do not provide the same catalytic benefits as iron.Incorrect
Answer: Option A
Explanation: The Haber process is an industrial method used for the synthesis of ammonia from nitrogen and hydrogen gases. Iron is used as a catalyst because it facilitates the breaking of nitrogen’s triple bond, which is one of the strongest bonds in chemistry, and thus accelerates the reaction. The catalyst is also promoted with small amounts of other substances like potassium and aluminum oxide to enhance its efficiency. Copper and platinum are not used in the Haber process as they do not provide the same catalytic benefits as iron. -
Question 2 of 5
2. Question
Which of the following statements about isotopes is correct?
(i) Isotopes have the same number of protons but different numbers of neutrons.
(ii) Isotopes have different atomic numbers but the same atomic mass.
(iii) Isotopes of an element have identical chemical properties.
(iv) Isotopes of an element have different physical properties.
Select the correct answer using the codes given below:Correct
Answer: Option B.
Explanation: Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. This means that while their atomic numbers (number of protons) are identical, their atomic masses differ due to the different numbers of neutrons. Isotopes have identical chemical properties because the chemical behavior of an element is determined by the number of electrons and the atomic number, both of which are the same for isotopes. However, their physical properties, such as density and melting point, differ due to the difference in mass. Hence, statement (ii) is incorrect as the atomic number remains the same, while atomic mass varies.Incorrect
Answer: Option B.
Explanation: Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. This means that while their atomic numbers (number of protons) are identical, their atomic masses differ due to the different numbers of neutrons. Isotopes have identical chemical properties because the chemical behavior of an element is determined by the number of electrons and the atomic number, both of which are the same for isotopes. However, their physical properties, such as density and melting point, differ due to the difference in mass. Hence, statement (ii) is incorrect as the atomic number remains the same, while atomic mass varies. -
Question 3 of 5
3. Question
Which of the following is NOT a property of an ionic compound?
(i) High melting and boiling points
(ii) Poor electrical conductivity in the solid state
(iii) Soluble in non-polar solvents
(iv) Conducts electricity in molten or aqueous stateSelect the correct answer using the code below:
Correct
Answer: Option C.
Explanation: Ionic compounds consist of positive and negative ions held together by strong electrostatic forces. These forces are responsible for their high melting and boiling points (statement i). In the solid state, ionic compounds do not conduct electricity because the ions are not free to move; they are fixed in a lattice (statement ii). However, in the molten or aqueous state, the ions are free to move, making ionic compounds good conductors of electricity (statement iv). Ionic compounds are typically soluble in polar solvents such as water, which can stabilize the ions, but they are not soluble in non-polar solvents, making statement (iii) incorrect.Incorrect
Answer: Option C.
Explanation: Ionic compounds consist of positive and negative ions held together by strong electrostatic forces. These forces are responsible for their high melting and boiling points (statement i). In the solid state, ionic compounds do not conduct electricity because the ions are not free to move; they are fixed in a lattice (statement ii). However, in the molten or aqueous state, the ions are free to move, making ionic compounds good conductors of electricity (statement iv). Ionic compounds are typically soluble in polar solvents such as water, which can stabilize the ions, but they are not soluble in non-polar solvents, making statement (iii) incorrect. -
Question 4 of 5
4. Question
Which of the following is/are allotropes of carbon?
(i) Graphite
(ii) Diamond
(iii) Fullerene
(iv) Silicon carbide
Select the correct answer using the code below:Correct
Answer: Option B
Explanation: Allotropes are different structural forms of the same element in the same physical state. Graphite, diamond, and fullerene are all allotropes of carbon, meaning they are composed entirely of carbon atoms but differ in the arrangement of those atoms, resulting in different physical properties. Graphite has a layered, planar structure with carbon atoms bonded in hexagonal patterns, making it soft and slippery. Diamond has a tetrahedral structure that makes it extremely hard. Fullerene consists of carbon atoms arranged in a spherical or cylindrical shape. Silicon carbide, on the other hand, is a compound of silicon and carbon, not an allotrope of carbon.Incorrect
Answer: Option B
Explanation: Allotropes are different structural forms of the same element in the same physical state. Graphite, diamond, and fullerene are all allotropes of carbon, meaning they are composed entirely of carbon atoms but differ in the arrangement of those atoms, resulting in different physical properties. Graphite has a layered, planar structure with carbon atoms bonded in hexagonal patterns, making it soft and slippery. Diamond has a tetrahedral structure that makes it extremely hard. Fullerene consists of carbon atoms arranged in a spherical or cylindrical shape. Silicon carbide, on the other hand, is a compound of silicon and carbon, not an allotrope of carbon. -
Question 5 of 5
5. Question
The rusting of iron is an example of:
(i) Oxidation
(ii) Reduction
(iii) Decomposition
(iv) Combination
Select the correct answer using the code given below:Correct
Answer: Option C
Explanation: Rusting is a chemical process where iron reacts with oxygen in the presence of water or moisture to form iron oxide, commonly known as rust. This process is a type of oxidation, as iron loses electrons to oxygen. It is also a combination reaction because two or more substances (iron, oxygen, and water) combine to form a single product, iron oxide. Reduction does not occur in rusting, and it is not a decomposition reaction, which involves a single substance breaking down into simpler substances.Incorrect
Answer: Option C
Explanation: Rusting is a chemical process where iron reacts with oxygen in the presence of water or moisture to form iron oxide, commonly known as rust. This process is a type of oxidation, as iron loses electrons to oxygen. It is also a combination reaction because two or more substances (iron, oxygen, and water) combine to form a single product, iron oxide. Reduction does not occur in rusting, and it is not a decomposition reaction, which involves a single substance breaking down into simpler substances.
