Chemistry (School & UG)
Q. What is the value of the ideal gas constant R in L·atm/(K·mol)?
A.
0.0821
B.
8.314
C.
62.36
D.
0.08314
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Solution
The ideal gas constant R is 0.0821 L·atm/(K·mol), which is commonly used in the ideal gas law.
Correct Answer: A — 0.0821
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Q. What is the van 't Hoff equation used for?
A.
To relate temperature and equilibrium constant
B.
To calculate reaction rates
C.
To determine solubility
D.
To find enthalpy changes
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Solution
The van 't Hoff equation relates the change in the equilibrium constant with temperature.
Correct Answer: A — To relate temperature and equilibrium constant
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Q. What is the van 't Hoff factor (i) for NaCl in solution?
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Solution
The van 't Hoff factor (i) for NaCl is 2 because it dissociates into two ions: Na+ and Cl-.
Correct Answer: B — 2
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Q. What is the van der Waals equation used for?
A.
Describing ideal gas behavior
B.
Describing real gas behavior
C.
Calculating enthalpy changes
D.
Calculating reaction rates
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Solution
The van der Waals equation accounts for the volume occupied by gas molecules and the attractive forces between them, thus describing real gas behavior.
Correct Answer: B — Describing real gas behavior
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Q. What is the wavelength of an electron moving with a velocity of 1 x 10^6 m/s? (h = 6.626 x 10^-34 J·s)
A.
6.63 x 10^-28 m
B.
6.63 x 10^-34 m
C.
6.63 x 10^-22 m
D.
6.63 x 10^-30 m
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Solution
Using de Broglie's equation, λ = h/p; p = mv = (9.11 x 10^-31 kg)(1 x 10^6 m/s). λ = 6.626 x 10^-34 / (9.11 x 10^-31)(1 x 10^6) = 6.63 x 10^-28 m.
Correct Answer: A — 6.63 x 10^-28 m
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Q. What is the wavelength range of UV-Vis spectroscopy?
A.
100-400 nm
B.
400-700 nm
C.
700-1000 nm
D.
1000-2000 nm
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Solution
UV-Vis spectroscopy typically covers the wavelength range from 100 to 400 nm for UV and 400 to 700 nm for visible light.
Correct Answer: A — 100-400 nm
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Q. What trend is observed in atomic radius across a period in the periodic table?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies randomly
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Solution
Atomic radius decreases across a period due to increasing nuclear charge attracting electrons closer.
Correct Answer: B — Decreases
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Q. What trend is observed in atomic radius as you move down a group in the periodic table?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies unpredictably
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Solution
Atomic radius increases down a group due to the addition of electron shells.
Correct Answer: A — Increases
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Q. What type of biomolecule is an enzyme?
A.
Carbohydrate
B.
Lipid
C.
Protein
D.
Nucleic acid
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Solution
Enzymes are proteins that act as catalysts in biochemical reactions, facilitating various metabolic processes.
Correct Answer: C — Protein
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Q. What type of bond connects nucleotides in a DNA strand?
A.
Hydrogen bonds
B.
Ionic bonds
C.
Covalent bonds
D.
Van der Waals forces
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Solution
Nucleotides in a DNA strand are connected by covalent bonds, specifically phosphodiester bonds.
Correct Answer: C — Covalent bonds
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Q. What type of bond is formed between hydrogen and chlorine in HCl?
A.
Ionic bond
B.
Covalent bond
C.
Metallic bond
D.
Hydrogen bond
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Solution
HCl is formed by a covalent bond between hydrogen and chlorine, where they share electrons.
Correct Answer: B — Covalent bond
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Q. What type of bond is formed between hydrogen and chlorine in hydrogen chloride (HCl)?
A.
Ionic
B.
Covalent
C.
Metallic
D.
Hydrogen
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Solution
Hydrogen chloride (HCl) features a covalent bond between hydrogen and chlorine.
Correct Answer: B — Covalent
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Q. What type of bond is formed between hydrogen and oxygen in water?
A.
Ionic bond
B.
Covalent bond
C.
Metallic bond
D.
Hydrogen bond
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Solution
The bond between hydrogen and oxygen in water is a covalent bond, where electrons are shared.
Correct Answer: B — Covalent bond
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Q. What type of bond is formed between Na and Cl in NaCl?
A.
Covalent
B.
Ionic
C.
Metallic
D.
Hydrogen
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Solution
NaCl is formed by the transfer of an electron from Na to Cl, resulting in an ionic bond.
Correct Answer: B — Ionic
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Q. What type of bond is formed between sodium and chlorine in sodium chloride?
A.
Covalent
B.
Ionic
C.
Metallic
D.
Hydrogen
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Solution
Sodium chloride is formed by ionic bonding between sodium ions and chloride ions.
Correct Answer: B — Ionic
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Q. What type of bond is primarily detected in the fingerprint region of an IR spectrum?
A.
C-H bonds
B.
O-H bonds
C.
C-C bonds
D.
Complex vibrations of multiple bonds
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Solution
The fingerprint region of an IR spectrum (typically 400-1500 cm-1) is characterized by complex vibrations of multiple bonds, making it unique for different compounds.
Correct Answer: D — Complex vibrations of multiple bonds
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Q. What type of bond is primarily formed between a transition metal and a ligand in coordination complexes?
A.
Ionic bond
B.
Covalent bond
C.
Metallic bond
D.
Coordinate covalent bond
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Solution
In coordination complexes, the bond formed between a transition metal and a ligand is primarily a coordinate covalent bond, where the ligand donates a pair of electrons.
Correct Answer: D — Coordinate covalent bond
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Q. What type of bond is primarily formed between hydrogen and oxygen in water?
A.
Ionic bond
B.
Covalent bond
C.
Metallic bond
D.
Hydrogen bond
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Solution
Water (H2O) is formed by covalent bonds between hydrogen and oxygen atoms.
Correct Answer: B — Covalent bond
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Q. What type of bond is primarily formed between sodium and chlorine in sodium chloride?
A.
Covalent bond
B.
Ionic bond
C.
Metallic bond
D.
Hydrogen bond
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Solution
Sodium chloride is formed by an ionic bond, which occurs due to the transfer of electrons from sodium to chlorine.
Correct Answer: B — Ionic bond
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Q. What type of bond is primarily formed in coordination compounds?
A.
Ionic bond
B.
Covalent bond
C.
Metallic bond
D.
Coordinate covalent bond
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Solution
Coordination compounds primarily involve coordinate covalent bonds, where a ligand donates a pair of electrons to a metal ion.
Correct Answer: D — Coordinate covalent bond
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Q. What type of complex is formed when a metal ion is surrounded by four ligands in a square planar arrangement?
A.
Tetrahedral complex
B.
Octahedral complex
C.
Square planar complex
D.
Linear complex
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Solution
A square planar complex is formed when a metal ion is surrounded by four ligands arranged in a square plane.
Correct Answer: C — Square planar complex
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Q. What type of detector is commonly used in mass spectrometry?
A.
UV detector
B.
Fluorescence detector
C.
Ion detector
D.
Conductivity detector
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Solution
Mass spectrometry commonly uses ion detectors to measure the abundance of ions generated from the sample.
Correct Answer: C — Ion detector
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Q. What type of detector is commonly used in UV-Vis spectroscopy?
A.
Photomultiplier tube
B.
Thermal conductivity detector
C.
Mass spectrometer
D.
Fluorescence detector
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Solution
Photomultiplier tubes are commonly used as detectors in UV-Vis spectroscopy due to their sensitivity to low light levels.
Correct Answer: A — Photomultiplier tube
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Q. What type of geometry is typically associated with a coordination number of 6?
A.
Tetrahedral
B.
Square planar
C.
Octahedral
D.
Linear
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Solution
A coordination number of 6 typically results in an octahedral geometry, which is common in many coordination complexes.
Correct Answer: C — Octahedral
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Q. What type of hybridization is present in methane (CH4)?
A.
sp
B.
sp2
C.
sp3
D.
sp3d
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Solution
In methane, the carbon atom undergoes sp3 hybridization, forming four equivalent sp3 hybrid orbitals that arrange tetrahedrally.
Correct Answer: C — sp3
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Q. What type of hybridization is present in the nitrogen atom of NH3?
A.
sp
B.
sp2
C.
sp3
D.
sp3d
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Solution
The nitrogen atom in NH3 (ammonia) is sp3 hybridized, forming three sigma bonds with hydrogen atoms and one lone pair.
Correct Answer: C — sp3
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Q. What type of information can be obtained from a UV-Vis spectrum?
A.
Molecular structure
B.
Concentration of ions
C.
Presence of functional groups
D.
All of the above
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Solution
A UV-Vis spectrum can provide information about molecular structure, concentration of absorbing species, and presence of functional groups based on absorbance patterns.
Correct Answer: D — All of the above
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Q. What type of information can be obtained from the fingerprint region of an IR spectrum?
A.
Functional group identification
B.
Molecular weight determination
C.
Unique molecular structure
D.
Concentration analysis
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Solution
The fingerprint region of an IR spectrum contains unique absorption patterns that can be used to identify specific molecular structures.
Correct Answer: C — Unique molecular structure
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Q. What type of information can be obtained from the IR spectrum of a compound?
A.
Molecular weight
B.
Functional groups present
C.
Concentration of the compound
D.
Thermal stability
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Solution
IR spectroscopy provides information about the functional groups present in a compound based on characteristic absorption bands.
Correct Answer: B — Functional groups present
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Q. What type of intermolecular force is primarily responsible for the high boiling point of water?
A.
London dispersion forces
B.
Dipole-dipole interactions
C.
Hydrogen bonding
D.
Ionic interactions
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Solution
Hydrogen bonding is the strongest intermolecular force present in water, significantly raising its boiling point compared to similar molecules.
Correct Answer: C — Hydrogen bonding
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