101- Which substituent is deactivating but directs electrophilic substitution mainly to ortho/para positions?
A. -Cl
B. -CN
C. -COOH
D. -OH
View Answer
Answer : A. -Cl
Description
102- The IUPAC name of CH3CH2Cl is:
A. Chloromethane
B. Chloroethane
C. Ethyl chloride
D. 1-Chloropropane
View Answer
Answer : B. Chloroethane
Description
103- Which is an addition polymer?
A. PVC
B. Polyester
C. Nylon-6,6
D. Nylon-6,10
View Answer
Answer : A. PVC
Description
104- CH3CH2COOH + C2H5OH produces an ester by:
A. Oxidation
B. Hydrolysis
C. Reduction
D. Esterification
View Answer
Answer : D. Esterification
Description
105- 1-Butene reacts with Br2 to form:
A. 1-Bromobutane
B. 2-Bromobutane
C. 1,1-Dibromobutane
D. 1,2-Dibromobutane
View Answer
Answer : D. 1,2-Dibromobutane
Description
106- Average kinetic energy of gas molecules is directly proportional to:
A. Pressure only
B. Volume only
C. Celsius temperature
D. Absolute temperature
View Answer
Answer : D. Absolute temperature
Description
107- For singly charged He+ and O+ ions, the ratio (e/m)He : (e/m)O is:
A. 4:1
B. 2:1
C. 1:2
D. 1:4
View Answer
Answer : A. 4:1
Description
108- The principal quantum number n primarily indicates:
A. Electron spin
B. Orbital orientation
C. Orbital size
D. Orbital shape only
View Answer
Answer : C. Orbital size
Description
109- The ground-state electronic configuration of chromium (Z = 24) is:
A. [Ar] 3d⁴4s²
B. [Ar] 3d⁶4s⁰
C. [Ar] 3d⁵4s¹
D. [Ar] 3d³4s³
View Answer
Answer : C. [Ar] 3d⁵4s¹
Description
110- Across a period from left to right, atomic radius generally:
A. Increases
B. Decreases
C. Remains constant
D. First increases then remains constant
View Answer
Answer : B. Decreases
Description
111- Across the first transition series from Sc to Zn, the shielding effect of added 3d electrons:
A. Increases slightly
B. Decreases markedly
C. Remains exactly constant
D. Increases dramatically
View Answer
Answer : A. Increases slightly
Description
112- A species with a more positive standard reduction potential has a greater tendency to:
A. Gain electrons
B. Lose electrons
C. Lose protons
D. Undergo oxidation
View Answer
Answer : A. Gain electrons
Description
113- Ionic character of a bond is most closely related to:
A. Atomic mass difference
B. Ionization energy alone
C. Electron affinity alone
D. Electronegativity difference
View Answer
Answer : D. Electronegativity difference
Description
114- The rule stating that degenerate orbitals are singly occupied with parallel spins before pairing is:
A. Aufbau principle
B. Pauli exclusion principle
C. Hund’s rule
D. Heisenberg uncertainty principle
View Answer
Answer : C. Hund's rule
Description
115- An atom has a mass number of 23 and contains 11 protons. The number of neutrons in this atom is:
A. 10
B. 11
C. 12
D. 23
View Answer
Answer : C. 12
Description
116- Partial reduction of a carboxylic acid produces:
A. Alkane
B. Alkene
C. Alcohol
D. Aldehyde
View Answer
Answer : D. Aldehyde
Description
117- Bernoulli's principle is a direct consequence of which fundamental law?
A. Newton’s Third Law
B. Law of Conservation of Energy
C. Pascal’s Law
D. Law of Conservation of Momentum
View Answer
Answer : B. Law of Conservation of Energy
Description
118- Which of the following is NOT an assumption of an ideal fluid?
A. Incompressible
B. Non-viscous
C. Irrotational flow
D. Obeys Stokes’ law
View Answer
Answer : D. Obeys Stokes' law
Description
119- If the wavelength of wave A is 2λ and that of wave B is λ, what is the ratio of their energies EA/EB (energy inversely related to wavelength squared, assuming same amplitude)?
A. 2
B. 1
C. 1/2
D. 1/4
View Answer
Answer : D. 1/4
Description
120- If the slope of a displacement-time graph increases at a constant rate, the motion is best described as:
