Undergraduate
Q. Which of the following is a thermosetting polymer?
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A.
Polyethylene
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B.
Polystyrene
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C.
Bakelite
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D.
PVC
Solution
Bakelite is a thermosetting polymer, while the others are thermoplastics.
Correct Answer: C — Bakelite
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Q. Which of the following is an example of an alkyne?
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A.
Ethane
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B.
Propene
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C.
Butyne
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D.
Benzene
Solution
Butyne is an alkyne, characterized by a triple bond between carbon atoms.
Correct Answer: C — Butyne
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Q. Which of the following is the conjugate of the complex number 2 - 3i? (2020)
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A.
2 + 3i
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B.
2 - 3i
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C.
3 - 2i
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D.
3 + 2i
Solution
The conjugate of a complex number a + bi is a - bi. Thus, the conjugate of 2 - 3i is 2 + 3i.
Correct Answer: A — 2 + 3i
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Q. Which of the following is the conjugate of the complex number 5 - 3i? (2020)
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A.
5 + 3i
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B.
5 - 3i
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C.
-5 + 3i
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D.
-5 - 3i
Solution
The conjugate of a complex number a + bi is a - bi. Thus, the conjugate of 5 - 3i is 5 + 3i.
Correct Answer: A — 5 + 3i
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Q. Which of the following is the correct dimensional formula for frequency? (2021)
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A.
[M^0 L^0 T^-1]
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B.
[M^0 L^1 T^-1]
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C.
[M^1 L^0 T^-1]
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D.
[M^0 L^0 T^1]
Solution
Frequency has the dimensional formula [M^0 L^0 T^-1].
Correct Answer: A — [M^0 L^0 T^-1]
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Q. Which of the following is the most acidic among the following oxides? (2019)
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A.
SO2
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B.
P2O5
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C.
CO2
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D.
N2O5
Solution
P2O5 is the most acidic oxide among the given options, as it forms phosphoric acid in water.
Correct Answer: B — P2O5
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Q. Which of the following pairs are both f-block elements?
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A.
Uranium and Thorium
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B.
Lanthanum and Cerium
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C.
Neodymium and Plutonium
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D.
Zirconium and Hafnium
Solution
Neodymium (Nd) and Plutonium (Pu) are both f-block elements.
Correct Answer: C — Neodymium and Plutonium
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Q. Which of the following processes is irreversible? (2022)
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A.
Isothermal expansion
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B.
Adiabatic expansion
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C.
Free expansion
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D.
Isobaric process
Solution
Free expansion is an irreversible process as it occurs without any external pressure acting on the gas.
Correct Answer: C — Free expansion
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Q. Which of the following processes is isochoric? (2023)
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A.
Constant volume
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B.
Constant pressure
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C.
Constant temperature
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D.
Adiabatic
Solution
An isochoric process is one that occurs at constant volume.
Correct Answer: A — Constant volume
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Q. Which of the following reactions involves a redox process? (2019)
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A.
H2 + Cl2 → 2HCl
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B.
NaCl → Na + Cl2
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C.
CaCO3 → CaO + CO2
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D.
H2O → H2 + O2
Solution
H2O → H2 + O2 involves the oxidation of water to hydrogen and oxygen, making it a redox reaction.
Correct Answer: D — H2O → H2 + O2
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Q. Which of the following states of matter has a definite shape?
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A.
Solid
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B.
Liquid
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C.
Gas
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D.
Plasma
Solution
Solids have a definite shape due to closely packed particles that do not move freely.
Correct Answer: A — Solid
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Q. Which of the following states of matter has a definite volume but no definite shape?
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A.
Solid
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B.
Liquid
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C.
Gas
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D.
Plasma
Solution
Liquids have a definite volume but take the shape of their container.
Correct Answer: B — Liquid
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Q. Which of the following states of matter has the highest kinetic energy? (2022)
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A.
Solid
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B.
Liquid
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C.
Gas
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D.
Plasma
Solution
Plasma has the highest kinetic energy as it consists of ionized gases with free-moving charged particles.
Correct Answer: D — Plasma
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Q. Which of the following states of matter has the least intermolecular forces?
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A.
Solid
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B.
Liquid
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C.
Gas
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D.
All are equal
Solution
Gases have the least intermolecular forces, allowing particles to move freely.
Correct Answer: C — Gas
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Q. Which polymer is commonly used in 3D printing?
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A.
PLA
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B.
PVC
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C.
Nylon
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D.
Polyethylene
Solution
PLA (Polylactic Acid) is a commonly used polymer in 3D printing due to its ease of use and biodegradability.
Correct Answer: A — PLA
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Q. Which polymer is known for its high resistance to heat?
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A.
Polyethylene
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B.
Teflon
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C.
Polypropylene
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D.
PVC
Solution
Teflon (PTFE) is known for its high heat resistance and non-stick properties.
Correct Answer: B — Teflon
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Q. Which reagent is commonly used to test for the presence of phenols?
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A.
Bromine water
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B.
Sodium dichromate
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C.
Fehling's solution
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D.
Tollens' reagent
Solution
Bromine water is used to test for phenols, as they will decolorize bromine water.
Correct Answer: A — Bromine water
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Q. Which state of matter has a definite shape and volume? (2017)
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A.
Solid
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B.
Liquid
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C.
Gas
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D.
Plasma
Solution
Solids have a definite shape and volume due to their closely packed particles.
Correct Answer: A — Solid
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Q. Which transition metal has the electron configuration [Ar] 3d6 4s2?
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A.
Titanium
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B.
Iron
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C.
Nickel
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D.
Cobalt
Solution
Iron (Fe) has the electron configuration [Ar] 3d6 4s2.
Correct Answer: B — Iron
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Q. Which transition metal has the highest melting point?
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A.
Iron
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B.
Tungsten
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C.
Nickel
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D.
Copper
Solution
Tungsten (W) has the highest melting point among transition metals.
Correct Answer: B — Tungsten
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Q. Which transition metal is known for forming complex ions with a coordination number of 6?
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A.
Copper
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B.
Nickel
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C.
Cobalt
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D.
Zinc
Solution
Cobalt commonly forms complex ions with a coordination number of 6, such as in [Co(NH3)6]3+.
Correct Answer: C — Cobalt
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Q. Which type of biomolecule is glucose?
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A.
Protein
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B.
Lipid
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C.
Carbohydrate
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D.
Nucleic Acid
Solution
Glucose is a simple sugar and is classified as a carbohydrate.
Correct Answer: C — Carbohydrate
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