Q. What is the main product of the reaction between an acid and a base? (2019)
-
A.
Salt
-
B.
Water
-
C.
Hydrogen gas
-
D.
Carbon dioxide
Solution
The main products of the neutralization reaction between an acid and a base are salt and water.
Correct Answer: A — Salt
Learn More →
Q. What is the main product of the reaction of 1-bromo-2-methylpropane with KOH in ethanol? (2020)
-
A.
2-methylpropene
-
B.
2-methylpropan-1-ol
-
C.
1-bromo-2-methylpropane
-
D.
2-bromo-2-methylpropane
Solution
The reaction of 1-bromo-2-methylpropane with KOH in ethanol leads to the formation of 2-methylpropene through an elimination reaction.
Correct Answer: A — 2-methylpropene
Learn More →
Q. What is the main product of the thermal decomposition of ammonium dichromate? (2023)
-
A.
Cr2O3
-
B.
CrO3
-
C.
Cr
-
D.
NH3
Solution
The thermal decomposition of ammonium dichromate produces chromium(III) oxide (Cr2O3) as the main product.
Correct Answer: A — Cr2O3
Learn More →
Q. What is the main product when 1-bromopropane is treated with alcoholic KOH? (2021)
-
A.
Propene
-
B.
1-propanol
-
C.
2-propanol
-
D.
Bromopropane
Solution
Alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-bromopropane.
Correct Answer: A — Propene
Learn More →
Q. What is the main product when 1-bromopropane is treated with magnesium in dry ether? (2019)
-
A.
Propane
-
B.
Grignard reagent
-
C.
Bromopropane
-
D.
Propyl alcohol
Solution
The reaction of 1-bromopropane with magnesium in dry ether forms the Grignard reagent, propylmagnesium bromide.
Correct Answer: B — Grignard reagent
Learn More →
Q. What is the main product when 1-chloropropane is treated with alcoholic KOH? (2019)
-
A.
Propene
-
B.
Propan-1-ol
-
C.
Propan-2-ol
-
D.
Chloropropane
Solution
Alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-chloropropane.
Correct Answer: A — Propene
Learn More →
Q. What is the main product when 1-chloropropane is treated with excess alcoholic KOH? (2020)
-
A.
Propene
-
B.
1-Propanol
-
C.
2-Propanol
-
D.
Chloropropane
Solution
Excess alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-chloropropane.
Correct Answer: A — Propene
Learn More →
Q. What is the main product when aluminum reacts with hydrochloric acid? (2023)
-
A.
AlCl3
-
B.
H2
-
C.
Al(OH)3
-
D.
Al2Cl6
Solution
When aluminum reacts with hydrochloric acid, hydrogen gas (H2) is produced along with aluminum chloride (AlCl3).
Correct Answer: B — H2
Learn More →
Q. What is the main product when an aldehyde is treated with sodium bisulfite? (2019)
-
A.
Aldol
-
B.
Bisulfite adduct
-
C.
Hydrocarbon
-
D.
Alcohol
Solution
The main product formed when an aldehyde reacts with sodium bisulfite is a bisulfite adduct.
Correct Answer: B — Bisulfite adduct
Learn More →
Q. What is the main product when an amine reacts with a carbonyl compound? (2019)
-
A.
Amide
-
B.
Alcohol
-
C.
Aldehyde
-
D.
Ketone
Solution
The main product of the reaction between an amine and a carbonyl compound is an amide.
Correct Answer: A — Amide
Learn More →
Q. What is the main product when an amine reacts with a haloalkane? (2019)
-
A.
Amide
-
B.
Quaternary ammonium salt
-
C.
Alcohol
-
D.
Ester
Solution
The main product of the reaction between an amine and a haloalkane is a quaternary ammonium salt.
Correct Answer: B — Quaternary ammonium salt
Learn More →
Q. What is the main product when ethene reacts with water in the presence of an acid? (2023)
-
A.
Ethanol
-
B.
Ethane
-
C.
Acetic acid
-
D.
Ethylene glycol
Solution
The reaction of ethene with water in the presence of an acid yields ethanol.
Correct Answer: A — Ethanol
Learn More →
Q. What is the main product when hydrogen reacts with oxygen? (2019)
-
A.
Water
-
B.
Hydrogen peroxide
-
C.
Ozone
-
D.
Hydroxide
Solution
When hydrogen reacts with oxygen, the main product formed is water (H2O).
Correct Answer: A — Water
Learn More →
Q. What is the main product when propan-2-one is treated with sodium borohydride? (2023)
-
A.
Propan-1-ol
-
B.
Propan-2-ol
-
C.
Propan-3-ol
-
D.
No reaction
Solution
Sodium borohydride reduces propan-2-one to propan-2-ol, which is a secondary alcohol.
Correct Answer: B — Propan-2-ol
Learn More →
Q. What is the main product when propanal is treated with sodium bisulfite? (2019)
-
A.
Sodium propanoate
-
B.
Propyl sulfonate
-
C.
Propane-1,2-diol
-
D.
A bisulfite adduct
Solution
Propanal reacts with sodium bisulfite to form a bisulfite adduct, which is a characteristic reaction of aldehydes.
Correct Answer: D — A bisulfite adduct
Learn More →
Q. What is the main purpose of a choke in an AC circuit? (2022)
-
A.
To increase current
-
B.
To decrease current
-
C.
To store energy
-
D.
To convert AC to DC
Solution
A choke is used to decrease current in an AC circuit by providing inductive reactance.
Correct Answer: B — To decrease current
Learn More →
Q. What is the main purpose of a Punnett square? (2020)
-
A.
To determine the phenotype
-
B.
To predict genetic variation
-
C.
To identify alleles
-
D.
To analyze pedigrees
Solution
A Punnett square is used to predict the genetic variation and possible genotypes of offspring from a genetic cross.
Correct Answer: B — To predict genetic variation
Learn More →
Q. What is the main purpose of amniotic fluid? (2022)
-
A.
Protection of the fetus
-
B.
Nourishment of the fetus
-
C.
Gas exchange
-
D.
Hormonal regulation
Solution
Amniotic fluid serves to protect the fetus by cushioning it from physical shocks and providing a stable environment.
Correct Answer: A — Protection of the fetus
Learn More →
Q. What is the main purpose of classification in biology? (2019)
-
A.
To identify organisms
-
B.
To understand evolutionary relationships
-
C.
To simplify the study of organisms
-
D.
All of the above
Solution
The main purpose of classification in biology is to identify organisms, understand evolutionary relationships, and simplify the study of organisms.
Correct Answer: D — All of the above
Learn More →
Q. What is the main purpose of family planning? (2021)
-
A.
To increase population growth
-
B.
To allow couples to decide the number and spacing of children
-
C.
To promote early childbirth
-
D.
To discourage contraceptive use
Solution
Family planning enables couples to make informed decisions about the number and spacing of their children.
Correct Answer: B — To allow couples to decide the number and spacing of children
Learn More →
Q. What is the main purpose of reproduction in organisms? (2020)
-
A.
To maintain homeostasis
-
B.
To produce energy
-
C.
To ensure species survival
-
D.
To grow and develop
Solution
The main purpose of reproduction is to ensure the survival of a species by producing new individuals.
Correct Answer: C — To ensure species survival
Learn More →
Q. What is the main purpose of respiration in plants? (2023)
-
A.
To produce glucose
-
B.
To release energy
-
C.
To absorb water
-
D.
To synthesize proteins
Solution
The main purpose of respiration in plants is to release energy from glucose, which is essential for various cellular processes.
Correct Answer: B — To release energy
Learn More →
Q. What is the main purpose of sexual reproduction? (2020)
-
A.
To produce more offspring
-
B.
To create genetic diversity
-
C.
To ensure survival of the species
-
D.
To reduce competition
Solution
The main purpose of sexual reproduction is to create genetic diversity, which can improve adaptability.
Correct Answer: B — To create genetic diversity
Learn More →
Q. What is the main purpose of the acrosome in sperm? (2022)
-
A.
To provide energy
-
B.
To penetrate the egg
-
C.
To store genetic material
-
D.
To aid in motility
Solution
The acrosome contains enzymes that help the sperm penetrate the outer layers of the egg during fertilization.
Correct Answer: B — To penetrate the egg
Learn More →
Q. What is the main purpose of the amniotic fluid? (2023)
-
A.
Protection of the fetus
-
B.
Nourishment of the fetus
-
C.
Gas exchange
-
D.
Hormonal regulation
Solution
The main purpose of the amniotic fluid is to protect the fetus by cushioning it from physical shocks.
Correct Answer: A — Protection of the fetus
Learn More →
Q. What is the main purpose of the G1 phase in the cell cycle? (2022)
-
A.
DNA replication
-
B.
Cell growth and preparation for DNA synthesis
-
C.
Chromosome separation
-
D.
Cell division
Solution
The G1 phase is primarily for cell growth and preparation for DNA synthesis.
Correct Answer: B — Cell growth and preparation for DNA synthesis
Learn More →
Q. What is the main purpose of the menstrual cycle? (2023)
-
A.
To prepare the body for pregnancy
-
B.
To produce sperm
-
C.
To regulate hormone levels
-
D.
To eliminate waste
Solution
The main purpose of the menstrual cycle is to prepare the female body for potential pregnancy each month.
Correct Answer: A — To prepare the body for pregnancy
Learn More →
Q. What is the main purpose of the S phase in the cell cycle? (2022)
-
A.
Cell growth
-
B.
DNA replication
-
C.
Cell division
-
D.
Protein synthesis
Solution
The S phase is specifically for DNA replication, ensuring that each daughter cell receives a complete set of chromosomes.
Correct Answer: B — DNA replication
Learn More →
Q. What is the main purpose of using biopesticides in agriculture? (2023)
-
A.
Increase crop yield
-
B.
Reduce chemical pesticide use
-
C.
Enhance soil fertility
-
D.
Improve water retention
Solution
Biopesticides are used to reduce the reliance on chemical pesticides, promoting a more sustainable approach to pest management.
Correct Answer: B — Reduce chemical pesticide use
Learn More →
Q. What is the main purpose of using bioreactors in biotechnology? (2023)
-
A.
To produce energy
-
B.
To grow microorganisms or cells
-
C.
To purify proteins
-
D.
To store genetic material
Solution
Bioreactors are designed to provide a controlled environment for the growth of microorganisms or cells for the production of bioproducts.
Correct Answer: B — To grow microorganisms or cells
Learn More →
Showing 991 to 1020 of 2736 (92 Pages)