Q. What is the total number of electrons in a neutral atom of carbon? (2019)
Solution
A neutral carbon atom has an atomic number of 6, which means it has 6 electrons.
Correct Answer:
B
— 6
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Q. What is the total number of neutrons in an atom of carbon-14? (2021)
Solution
Carbon-14 has an atomic number of 6 (6 protons). The mass number is 14, so the number of neutrons is 14 - 6 = 8.
Correct Answer:
B
— 7
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Q. What type of bond is present in a saturated hydrocarbon?
-
A.
Double bond
-
B.
Triple bond
-
C.
Single bond
-
D.
Quadruple bond
Solution
Saturated hydrocarbons contain only single bonds between carbon atoms.
Correct Answer:
C
— Single bond
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Q. What type of reaction is represented by the equation: CaCO3 → CaO + CO2? (2020)
-
A.
Synthesis
-
B.
Decomposition
-
C.
Single replacement
-
D.
Double replacement
Solution
The reaction CaCO3 → CaO + CO2 is a decomposition reaction, where one compound breaks down into two products.
Correct Answer:
B
— Decomposition
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Q. What type of reaction occurs when an acid reacts with a base? (2021)
-
A.
Decomposition
-
B.
Synthesis
-
C.
Neutralization
-
D.
Combustion
Solution
An acid reacting with a base results in a neutralization reaction, producing salt and water.
Correct Answer:
C
— Neutralization
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Q. Which metal is commonly used in batteries?
-
A.
Lead
-
B.
Copper
-
C.
Iron
-
D.
Aluminum
Solution
Lead is commonly used in lead-acid batteries due to its ability to store electrical energy.
Correct Answer:
A
— Lead
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Q. Which metal is commonly used in the production of alloys? (2021)
-
A.
Lead
-
B.
Tin
-
C.
Mercury
-
D.
Bismuth
Solution
Tin is commonly used in the production of alloys, such as bronze and solder.
Correct Answer:
B
— Tin
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Q. Which metal is commonly used in the production of batteries? (2023)
-
A.
Lead
-
B.
Zinc
-
C.
Copper
-
D.
Iron
Solution
Lead is commonly used in lead-acid batteries due to its ability to store electrical energy.
Correct Answer:
A
— Lead
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Q. Which metal is commonly used in the production of stainless steel? (2023)
-
A.
Iron
-
B.
Lead
-
C.
Copper
-
D.
Zinc
Solution
Iron is the primary metal used in the production of stainless steel, often alloyed with chromium and nickel.
Correct Answer:
A
— Iron
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Q. Which metal is known for its high resistance to corrosion?
-
A.
Iron
-
B.
Copper
-
C.
Aluminum
-
D.
Titanium
Solution
Titanium is known for its high resistance to corrosion, making it suitable for various applications.
Correct Answer:
D
— Titanium
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Q. Which metal is known for its resistance to corrosion?
-
A.
Iron
-
B.
Copper
-
C.
Aluminum
-
D.
Gold
Solution
Gold is highly resistant to corrosion and tarnishing, making it valuable for jewelry and electronics.
Correct Answer:
D
— Gold
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Q. Which metal is primarily used in the construction of aircraft due to its strength-to-weight ratio?
-
A.
Titanium
-
B.
Aluminum
-
C.
Steel
-
D.
Copper
Solution
Aluminum is primarily used in aircraft construction because of its favorable strength-to-weight ratio.
Correct Answer:
B
— Aluminum
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Q. Which metal is primarily used in the production of stainless steel?
-
A.
Iron
-
B.
Nickel
-
C.
Chromium
-
D.
Zinc
Solution
Chromium is added to iron to produce stainless steel, enhancing its corrosion resistance.
Correct Answer:
C
— Chromium
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Q. Which metal is used in the production of stainless steel?
-
A.
Nickel
-
B.
Zinc
-
C.
Tin
-
D.
Lead
Solution
Nickel is used in the production of stainless steel to enhance its corrosion resistance.
Correct Answer:
A
— Nickel
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Q. Which non-metal is a diatomic molecule at room temperature?
-
A.
Oxygen
-
B.
Nitrogen
-
C.
Hydrogen
-
D.
All of the above
Solution
Oxygen, Nitrogen, and Hydrogen are all diatomic molecules at room temperature.
Correct Answer:
D
— All of the above
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Q. Which non-metal is commonly used in fertilizers?
-
A.
Phosphorus
-
B.
Sulfur
-
C.
Chlorine
-
D.
Argon
Solution
Phosphorus is a key component in fertilizers, promoting plant growth.
Correct Answer:
A
— Phosphorus
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Q. Which non-metal is essential for respiration in living organisms? (2020)
-
A.
Oxygen
-
B.
Nitrogen
-
C.
Carbon
-
D.
Hydrogen
Solution
Oxygen is essential for respiration as it is used by organisms to convert food into energy.
Correct Answer:
A
— Oxygen
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Q. Which non-metal is essential for the process of photosynthesis?
-
A.
Oxygen
-
B.
Carbon
-
C.
Nitrogen
-
D.
Hydrogen
Solution
Carbon is essential for photosynthesis as plants convert carbon dioxide into glucose.
Correct Answer:
B
— Carbon
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Q. Which non-metal is used in the production of fertilizers? (2022)
-
A.
Nitrogen
-
B.
Oxygen
-
C.
Helium
-
D.
Argon
Solution
Nitrogen is a key component in fertilizers, essential for plant growth.
Correct Answer:
A
— Nitrogen
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Q. Which of the following compounds is a weak acid?
-
A.
Hydrochloric acid
-
B.
Nitric acid
-
C.
Acetic acid
-
D.
Sulfuric acid
Solution
Acetic acid (CH3COOH) is a weak acid that does not completely dissociate in solution.
Correct Answer:
C
— Acetic acid
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Q. Which of the following compounds is an alcohol?
-
A.
C2H5OH
-
B.
C2H4
-
C.
C2H6
-
D.
C2H2
Solution
C2H5OH is ethanol, which is an alcohol.
Correct Answer:
A
— C2H5OH
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Q. Which of the following compounds is an alkali metal? (2023)
-
A.
Calcium
-
B.
Sodium
-
C.
Magnesium
-
D.
Aluminum
Solution
Sodium is an alkali metal, found in Group 1 of the periodic table, characterized by its high reactivity.
Correct Answer:
B
— Sodium
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Q. Which of the following compounds is an example of an alcohol?
-
A.
C2H5OH
-
B.
C2H4
-
C.
C3H6
-
D.
C4H10
Solution
C2H5OH is ethanol, which is an alcohol.
Correct Answer:
A
— C2H5OH
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Q. Which of the following compounds is formed when iron reacts with oxygen? (2020)
-
A.
Iron(II) oxide
-
B.
Iron(III) oxide
-
C.
Iron hydroxide
-
D.
Iron sulfate
Solution
Iron reacts with oxygen to form Iron(III) oxide (Fe2O3) when sufficient oxygen is present.
Correct Answer:
B
— Iron(III) oxide
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Q. Which of the following compounds is formed when magnesium reacts with hydrochloric acid? (2020)
-
A.
MgCl2
-
B.
MgHCl
-
C.
MgO
-
D.
Mg(OH)2
Solution
Magnesium reacts with hydrochloric acid to form magnesium chloride (MgCl2) and hydrogen gas.
Correct Answer:
A
— MgCl2
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Q. Which of the following compounds is formed when sodium reacts with chlorine? (2021)
-
A.
Sodium chloride
-
B.
Sodium oxide
-
C.
Sodium bicarbonate
-
D.
Sodium sulfate
Solution
When sodium reacts with chlorine, sodium chloride (NaCl) is formed.
Correct Answer:
A
— Sodium chloride
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Q. Which of the following indicators is suitable for a strong acid-strong base titration?
-
A.
Methyl orange
-
B.
Phenolphthalein
-
C.
Bromothymol blue
-
D.
Litmus
Solution
Bromothymol blue changes color at a neutral pH, making it suitable for strong acid-strong base titrations.
Correct Answer:
C
— Bromothymol blue
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Q. Which of the following indicators is used to determine the endpoint of a strong acid-strong base titration?
-
A.
Methyl orange
-
B.
Phenolphthalein
-
C.
Bromothymol blue
-
D.
Litmus
Solution
Phenolphthalein is commonly used for strong acid-strong base titrations as it changes color at pH 8.2-10.
Correct Answer:
B
— Phenolphthalein
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Q. Which of the following indicators would be suitable for a strong acid-strong base titration?
-
A.
Methyl orange
-
B.
Phenolphthalein
-
C.
Bromothymol blue
-
D.
Litmus
Solution
Bromothymol blue is suitable for strong acid-strong base titrations as it changes color around pH 7.
Correct Answer:
C
— Bromothymol blue
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Q. Which of the following indicators would be suitable for a titration between a strong acid and a strong base?
-
A.
Methyl orange
-
B.
Phenolphthalein
-
C.
Litmus
-
D.
Bromothymol blue
Solution
Phenolphthalein is suitable as it changes color around pH 7-10, which is ideal for strong acid-strong base titrations.
Correct Answer:
B
— Phenolphthalein
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