Q. What is the primary product of the reaction between hydrogen and chlorine? (2019)
A.
Hydrochloric acid
B.
Hydrogen chloride
C.
Chlorine gas
D.
Water
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Solution
The primary product of the reaction between hydrogen and chlorine is hydrogen chloride (HCl).
Correct Answer: B β Hydrogen chloride
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Q. What is the primary product of the thermal decomposition of calcium carbonate? (2019)
A.
Calcium oxide
B.
Calcium hydroxide
C.
Calcium bicarbonate
D.
Calcium chloride
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Solution
The thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2).
Correct Answer: A β Calcium oxide
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Q. What is the primary product when 1-bromo-2-methylpropane reacts with KOH in ethanol?
A.
2-methylpropene
B.
1-methylpropene
C.
2-bromopropane
D.
no reaction
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Solution
The reaction leads to the formation of 2-methylpropene through an elimination reaction.
Correct Answer: A β 2-methylpropene
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Q. What is the primary product when 1-chloropropane reacts with potassium tert-butoxide?
A.
Propene
B.
2-methylpropane
C.
1-butene
D.
No reaction
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Solution
The reaction of 1-chloropropane with potassium tert-butoxide leads to the formation of propene via an elimination reaction.
Correct Answer: A β Propene
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Q. What is the primary product when a carboxylic acid is reduced with lithium aluminum hydride (LiAlH4)?
A.
Alcohol
B.
Aldehyde
C.
Ketone
D.
Ester
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Solution
Lithium aluminum hydride reduces carboxylic acids to primary alcohols.
Correct Answer: A β Alcohol
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Q. What is the primary product when a carboxylic acid reacts with thionyl chloride (SOCl2)?
A.
Acid chloride
B.
Ester
C.
Alcohol
D.
Aldehyde
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Solution
The primary product of the reaction between a carboxylic acid and thionyl chloride is an acid chloride.
Correct Answer: A β Acid chloride
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Q. What is the primary product when aluminum reacts with hydrochloric acid? (2020)
A.
AlCl3
B.
H2
C.
Al(OH)3
D.
Al2Cl6
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Solution
When aluminum reacts with hydrochloric acid, hydrogen gas (H2) is produced along with aluminum chloride (AlCl3).
Correct Answer: B β H2
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Q. What is the primary product when ammonia reacts with an alkyl halide?
A.
Amine
B.
Amide
C.
Alkane
D.
Alcohol
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Solution
The primary product of the reaction between ammonia and an alkyl halide is an amine.
Correct Answer: A β Amine
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Q. What is the primary product when an alcohol is oxidized?
A.
Alkane
B.
Aldehyde
C.
Ketone
D.
Carboxylic acid
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Solution
The primary product of the oxidation of a primary alcohol is an aldehyde.
Correct Answer: B β Aldehyde
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Q. What is the primary product when chlorobenzene is treated with sodium hydroxide at high temperature?
A.
Phenol
B.
Benzene
C.
Chlorobenzene
D.
Sodium chloride
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Solution
Chlorobenzene reacts with sodium hydroxide at high temperature to form phenol.
Correct Answer: A β Phenol
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Q. What is the primary product when ethene reacts with water in the presence of an acid?
A.
Ethanol
B.
Ethane
C.
Ethanoic acid
D.
Ethylene glycol
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Solution
The reaction of ethene with water in the presence of an acid (hydration) produces ethanol.
Correct Answer: A β Ethanol
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Q. What is the primary product when hydrogen reacts with oxygen?
A.
Water
B.
Hydrogen peroxide
C.
Ozone
D.
Hydroxyl radical
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Solution
The primary product of the reaction between hydrogen and oxygen is water (H2O).
Correct Answer: A β Water
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Q. What is the primary product when lithium reacts with nitrogen? (2022)
A.
Lithium nitride
B.
Lithium oxide
C.
Lithium hydroxide
D.
Lithium carbonate
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Solution
Lithium reacts with nitrogen to form lithium nitride (Li3N).
Correct Answer: A β Lithium nitride
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Q. What is the primary product when magnesium reacts with dilute hydrochloric acid?
A.
Magnesium chloride
B.
Hydrogen gas
C.
Magnesium hydroxide
D.
Magnesium oxide
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Solution
The primary products of the reaction between magnesium and dilute hydrochloric acid are magnesium chloride (MgCl2) and hydrogen gas (H2).
Correct Answer: A β Magnesium chloride
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Q. What is the primary product when potassium permanganate (KMnO4) is reduced in acidic medium? (2019)
A.
MnO2
B.
Mn2+
C.
MnO4-
D.
KMnO4
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Solution
In acidic medium, potassium permanganate (KMnO4) is reduced to Mn2+.
Correct Answer: B β Mn2+
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Q. What is the primary product when sodium bicarbonate reacts with hydrochloric acid?
A.
Sodium chloride
B.
Carbon dioxide
C.
Water
D.
All of the above
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Solution
The reaction produces sodium chloride, carbon dioxide, and water.
Correct Answer: D β All of the above
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Q. What is the primary purpose of a demodulator in a communication system?
A.
To amplify the signal
B.
To convert the signal back to its original form
C.
To filter the noise
D.
To encode the signal
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Solution
A demodulator converts the modulated signal back to its original form.
Correct Answer: B β To convert the signal back to its original form
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Q. What is the primary purpose of a firewall? (2023)
A.
To speed up internet connection
B.
To protect against unauthorized access
C.
To store data
D.
To manage network traffic
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Solution
The primary purpose of a firewall is to protect a network from unauthorized access and threats.
Correct Answer: B β To protect against unauthorized access
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Q. What is the primary purpose of a modulator in a communication system?
A.
To amplify the signal
B.
To convert digital signals to analog
C.
To filter noise
D.
To encode information
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Solution
A modulator converts digital signals to analog for transmission.
Correct Answer: B β To convert digital signals to analog
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Q. What is the primary purpose of a national budget? (2023)
A.
To control inflation
B.
To allocate resources
C.
To increase GDP
D.
To reduce taxes
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Solution
The primary purpose of a national budget is to allocate resources effectively across various sectors.
Correct Answer: B β To allocate resources
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Q. What is the primary purpose of a web browser? (2022)
A.
To send emails
B.
To browse the internet
C.
To create websites
D.
To store files
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Solution
The primary purpose of a web browser is to browse the internet and display web pages.
Correct Answer: B β To browse the internet
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Q. What is the primary purpose of an operating system?
A.
To manage hardware resources
B.
To create documents
C.
To browse the internet
D.
To play games
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Solution
The primary purpose of an operating system is to manage hardware resources.
Correct Answer: A β To manage hardware resources
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Q. What is the primary purpose of applying constraints to sets in mathematical contexts?
A.
To increase the number of elements in a set.
B.
To simplify the analysis of the set.
C.
To ensure all elements are unique.
D.
To define a specific subset of elements.
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Solution
The primary purpose of applying constraints is to define a specific subset of elements that meet certain criteria.
Correct Answer: D β To define a specific subset of elements.
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Q. What is the primary purpose of constraint-based distribution in physics? (2021)
A.
To maximize energy efficiency
B.
To ensure equilibrium in a system
C.
To minimize the total mass
D.
To optimize speed
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Solution
Constraint-based distribution ensures that all forces in a system are balanced, leading to equilibrium.
Correct Answer: B β To ensure equilibrium in a system
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Q. What is the primary purpose of defining constraints in a set?
A.
To limit the number of elements in the set.
B.
To clarify the properties of the elements in the set.
C.
To ensure all elements are unique.
D.
To establish relationships between different sets.
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Solution
Defining constraints helps clarify the specific properties that elements must possess to be included in the set.
Correct Answer: B β To clarify the properties of the elements in the set.
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Q. What is the primary purpose of establishing roles within a team?
A.
To limit participation
B.
To clarify responsibilities
C.
To create hierarchy
D.
To increase competition
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Solution
Establishing roles helps clarify responsibilities, ensuring that all tasks are covered and reducing overlap.
Correct Answer: B β To clarify responsibilities
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Q. What is the primary purpose of modulation in communication systems?
A.
To increase the bandwidth of the signal
B.
To reduce noise in the signal
C.
To allow the transmission of signals over long distances
D.
To convert digital signals to analog signals
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Solution
Modulation allows signals to be transmitted over long distances by shifting the frequency of the signal to a higher range, making it suitable for transmission through various media.
Correct Answer: C β To allow the transmission of signals over long distances
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Q. What is the primary purpose of reading comprehension strategies? (2021)
A.
To memorize information
B.
To enhance understanding of the text
C.
To improve writing skills
D.
To increase reading speed
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Solution
Reading comprehension strategies are designed to help readers understand and interpret the text more effectively.
Correct Answer: B β To enhance understanding of the text
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Q. What is the primary purpose of reproduction in organisms? (2020)
A.
To increase genetic diversity
B.
To maintain homeostasis
C.
To produce energy
D.
To ensure survival of the species
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Solution
Reproduction ensures the continuation of a species by producing offspring.
Correct Answer: D β To ensure survival of the species
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Q. What is the primary purpose of reproductive health education? (2020)
A.
To promote early marriage
B.
To prevent sexually transmitted diseases
C.
To encourage multiple partners
D.
To discourage family planning
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Solution
Reproductive health education aims to inform individuals about safe practices, including the prevention of sexually transmitted diseases.
Correct Answer: B β To prevent sexually transmitted diseases
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