1st Year Chemistry MCQs

• Here are the detailed chemistry first year mcqs to help you prepare for your exams.
• Important Multiple Choice Questions (MCQs) of every chapter of 1st year Chemistry.
• When hot saturated solution is cooled very slowly we get:(a) Medium size crystals (b) Large size crystals (c) Premature crystallization of the substance (d) No crystals
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• Chromatography is the process which involves the distribution of a solute between: (a) Two mobile phases (b) A stationary phase and a mobile phase (c) Two stationary and two mobile phases (d) Two stationary phases
• In CCl4 solvent, I2 shows: (a) Blue colour (b) Brown colour (c) Pink colour (d) Purple colour
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• The drying Agents used in vacuum desiccator are: (a) CaCl2 (b) Silica gel (c) Both a and b (d) None
• The ratio of the solute in organic phase to that in aqueous phase is called: (a) Rate constant (b) Equilibrium constant (c) Distribution coefficient (d) Arrhenius constant
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• In chromatography the stationary phase: (a) Is a solid (b) Is a liquid (c) May be liquid or gas (d) May be solid or liquid
• The drying agents used in vacuum desiccator are: (a) AgCl (b) NH4Cl (c) CaCl2 (d) AlCl3
• Gooch crucible is made of: (a) Clay (b) Asbestos (c) Porcelain (d) Iron
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• Solvent extraction is a process: (a) Exothermic (b) Endothermic (c) Equilibrium (d) Non-equilibrium
• Purity of a substance is checked by: (a) Crystallization (b) Sublimation (c) Solvent extraction (d) Chromatography 
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• Polarizability is measure of extent of distortion: (a) Qualitative (b) Quantitative (c) Systematic (d) None of these
• Heat change for one mole of a solid during converting into liquid is called: (a) Molar heat of vaporization (b) Molar heat of sublimation (c) Molar heat of fusion (d) Enthalpy change
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• Which of the following does not form a molecular crystal? (a) Ice (b) Graphite (c) Iodine (d) Sugar
• Evaporation causes: (a) Cooling (b) Heating (c) Boiling (d) irritation
• Diamond and graphite are example of: (a) Isomorphism (b) Polymorphism (c) Isomerism (d) Allotropy
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• Dipole-induced dipole forces are also called: (a) London dispersion forces (b) Debye forces (c) Huckel forces (d) Electrostatic forces
• Crystal system shown by diamond is: (a) Cubic (b) Tetragonal (c) Monoclinic (d) Hexagonal
• The strongest acid among halogen acids is: (a) HF (b) HCl (c) HBr (d) HI
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• The number of Clions per unit cell of NaCl is: (a) 8 (b) 6 (c) 4 (d) 2
• How much more space is occupied by water on freezing: (a) 9% (b) 8% (c) 7% (d) 6%
• Boiling point of H2O at Mount Everest would be: (a) 98oC (b) 100oC (c) 101oC (d) 69oC
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• Allotropy is the property of: (a) Compound (b) Element (c) Atoms (d) Mixture
• Negative charge on cathode rays we established by:(a) William Crook (b) J. Perrin (c) R.A Millikan (d) Hittrof
• An orbital which is spherical and symmetrical is: (a) s-orbital (b) p-orbital (c) d-orbital (d) f-orbital
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• Angstrom is the unit of: (a) time (b) length (c) mass (d) frequency
• Cathode rays consist of: (a) Electrons (b) Protons (c) Neutrons (d) Nucleons
• The d-subshell consists of: (a) 5-orbitals (b) 6-orbitals (c) 7-orbitals (d) 10-orbitals
• Orbitals having same energy are called: (a) Hybrid orbitals (b) Valence orbitals (c) d-orbitals (d) Degenerate orbitals
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• Positive rays were discovered by: (a) J.J. Thomson (b) Rutherford (c) William Crooks (d) E. Goldstein
• Mass of one mole of electron is: (a) 0.55 mg (b) 0.184 mg (c) 1.673 mg (d) 1.008 mg
• For the P sub shell the azimuthal quantum number “l” is: (a) 2 (b) 3 (c) zero (d) 1
• Positive ions are called: (a) Cations (b) Anions (c) Molecules (d) Hydrated ions
• Total number of bonds in C2H4 molecule is: (a) Six (b) Four (c) Five (d) Eight
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• The S.I unit of dipole moment is: (a) Joule (b) Debye (c) Coulomb meter (d) Nm-2
• Ionic, covalent and co-ordinate covalent bond are present in: (a) SO2 (b) NH4Cl (c) C2H2 (d) H2O
• The highest electronegative element in the periodic table is: (a) Oxygen (b) Nitrogen (c) Chlorine (d) Fluorine
• The geometry of BeCl2 is: (a) Linear (b) Plane triangular (c) Tetrahedral (d) None of these
• Orbitals having same energy are called: (a) Hybrid orbitals (b) Degenerate orbitals (c) Valence orbitals (d) Molecular orbitals
• The four equivalent sp3 hybrid orbitals in space are at angels of: (a) 120o (b) 107.5o (c) 109.5o (d) 104.5o
• Which has unpaired electrons in anti-bonding molecular orbitals? (a) N2 -2 (b) O2 +2 (c) B2 (d) F2