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1st Year Chemistry Guess 2018 (All Punjab Boards)
Important MCQs
Which statement is not true?
(A) Isotopes with even atomic masses are comparatively abundant
(B) Isotopes with odd atomic masses are comparatively abundant
(C) Isotopes even atomic masses and even atomic numbers are comparatively abundant
(D) Isotopes with even atomic masses and odd atomic numbers are comparatively abundant
Silver has isotopes: (9/, 16, 17, 18)
Whith statement is not correct about galvanic cell?
(A) Anode is negatively charged
(B) Reduction occurs at anode
(C) Cathode is positively charged
(D) Reduction occurs at cathode
Which statement about the following equilibrium is correct 2S02(g) + 02(0….77-2S03(g) AH = — 188.3 KJ/ mole
(A) The value of Kp falls with rise in temperature
(B) The value of Kp falls with increase in pressure
(C) Adding V205 catalyst increases the equilibrium yield of sulphur trioxide
(D) The value Kp = Ke
A substance which makes the catalyst more effective is called
(A) Inhibitor
(B) Retarder
(C) Promoter
(D) Auto Catalyst
The mass of two moles of electrons is
(A) 1.10 mg
(B) 1.008 mg
(C) 0.184 mq
(D) 1.673 mg
2.7 g of At will react completely with how much mass of 02 to produce At203
(A) 0.8 g of oxygen
(B) 1.6 g of oxygen
(C) 3.2 g of oxygen
(D) 2.4 g of oxygen
Mass of one mole of electron is
(A) 1.008 mg
(B).0.55 mg
(C) 1.84 mg
(D) 1.673mg
0.1 mole of solute dissolved in 100g of the solvent will be
(A) 0.1 molal
(B) 1.0 molal
(C) 0.5 molal
(D) None of these
Solvent extraction method is particularly useful technique for separation when the product to be separated is
(A) Non-volatile or thermally unstable
(B) Volatile or thermally stable
(C) Non-volatile or thermally stable
(D) Volatile or thermally unstable
Solvent extraction is an equilibrium process and it is controlled by
(A) Law of mass action
(B) Distribution law
(C) The amount of solvent used
, 2
Law of mass action was derived by Gulberg and wage in
(A) 1909
(B) 1906
(C) 1846
(D) 1864
In solvent extraction the law applied is
(A) Law of mass action
(B) Distribution law
(C) Coulomb’s law
(D) Boyle’s law
Solvent extraction is a process
(A) Exothermic
(B) Endothermic
(C) Equilibrium
(D) Non-equilibrium
London dispersion forces are the only forces present among the
(A) Molecules of water in liquid state
(B) Atoms of helium in gaseous state at high temperature
(C) Molecules of solid iodine
(D) Molecules of hydrogen chloride gas
The molecules of CO2 in dry ice form the
(A) Ionic crystals
(B) Covalent crystals
(C) Molecular crystals
(D) Any type of crystals
Which of the following molecules has zero dipole moment?
(A) NH3
(B) CFICei
(C) H2O
(D) BF3
The most stable elements are
(A) Halogens
(B) Lithium family
(C) Noble gases
(D) None of these
Bond angle (I) in case of ammonia molecule is
(A) 105°
(B) 107.5°
(C) 120°
(D) 180°
The number of bonds in oxygen molecule is
(A) One a and one 7
(B) One a and two 7
(C) Three sigma only
(D) Two sigma only
In dry ice CO2 molecules form
(A) Ionic crystals
(B) Covalent crystals
(C) Molecular crystals
(D) Any type of crystals
Escape out of gas molecules one by one through tiny hole is
(A) Diffusion
(B) Effusion
(C) Osmosis
(D) All of these
, 3
Angstrom is the unit of
(A) Time
(B) Lengthy
(A) Mass
(A) Frequency
Largest number of molecules are in
(A) 3.6 gmH20
(B) 4.8 gm C2H5OH
(C) 2.8 gm CO
(D) 5.8 gm N205
Which molecule has zero dipole moment?
(A) NH3
(B) CHC 3
(C) H2O
(D) BF3
An orbital which is spherical and symmetrical is
(A) s-orbital
(B) p-orbital
(A) d-orbital
(A) f-orbital
Quantum number values for 21 orbitals are
(A) n = 2, = 1
(B) n = 1, = 2
(C) n = 1, =0
(D) n = 2, t =0
The four equivalents SP3 hybrid orbitals in space are at an angle of
(A) 120°
(B) 107.5°
(C) 104.5°
(D) 109.5°
The nature of positive rays depends on
(A) The nature of electrode
(B) The nature of discharge tube
(C) The nature of residual gas
(D) The temperature
Cathode in NICAD is
(A) Ag2O
(B) N102
(C) Cd
(D) Zn
Cathode rays strike alumina and produce a colour
(A) Red
(B) Blue
(C) Yellow
(D) Green
Positive ions are called
(A) cations
(B) Annions
(C) Molecules
(D) Hydrated ions
The —e value for the positive rays is maximum for
(A) Hydrogen
(B) Helium
(C) Oxygen
1st Year Chemistry Guess 2018 (All Punjab Boards)
Important MCQs
Which statement is not true?
(A) Isotopes with even atomic masses are comparatively abundant
(B) Isotopes with odd atomic masses are comparatively abundant
(C) Isotopes even atomic masses and even atomic numbers are comparatively abundant
(D) Isotopes with even atomic masses and odd atomic numbers are comparatively abundant
Silver has isotopes: (9/, 16, 17, 18)
Whith statement is not correct about galvanic cell?
(A) Anode is negatively charged
(B) Reduction occurs at anode
(C) Cathode is positively charged
(D) Reduction occurs at cathode
Which statement about the following equilibrium is correct 2S02(g) + 02(0….77-2S03(g) AH = — 188.3 KJ/ mole
(A) The value of Kp falls with rise in temperature
(B) The value of Kp falls with increase in pressure
(C) Adding V205 catalyst increases the equilibrium yield of sulphur trioxide
(D) The value Kp = Ke
A substance which makes the catalyst more effective is called
(A) Inhibitor
(B) Retarder
(C) Promoter
(D) Auto Catalyst
The mass of two moles of electrons is
(A) 1.10 mg
(B) 1.008 mg
(C) 0.184 mq
(D) 1.673 mg
2.7 g of At will react completely with how much mass of 02 to produce At203
(A) 0.8 g of oxygen
(B) 1.6 g of oxygen
(C) 3.2 g of oxygen
(D) 2.4 g of oxygen
Mass of one mole of electron is
(A) 1.008 mg
(B).0.55 mg
(C) 1.84 mg
(D) 1.673mg
0.1 mole of solute dissolved in 100g of the solvent will be
(A) 0.1 molal
(B) 1.0 molal
(C) 0.5 molal
(D) None of these
Solvent extraction method is particularly useful technique for separation when the product to be separated is
(A) Non-volatile or thermally unstable
(B) Volatile or thermally stable
(C) Non-volatile or thermally stable
(D) Volatile or thermally unstable
Solvent extraction is an equilibrium process and it is controlled by
(A) Law of mass action
(B) Distribution law
(C) The amount of solvent used
, 2
Law of mass action was derived by Gulberg and wage in
(A) 1909
(B) 1906
(C) 1846
(D) 1864
In solvent extraction the law applied is
(A) Law of mass action
(B) Distribution law
(C) Coulomb’s law
(D) Boyle’s law
Solvent extraction is a process
(A) Exothermic
(B) Endothermic
(C) Equilibrium
(D) Non-equilibrium
London dispersion forces are the only forces present among the
(A) Molecules of water in liquid state
(B) Atoms of helium in gaseous state at high temperature
(C) Molecules of solid iodine
(D) Molecules of hydrogen chloride gas
The molecules of CO2 in dry ice form the
(A) Ionic crystals
(B) Covalent crystals
(C) Molecular crystals
(D) Any type of crystals
Which of the following molecules has zero dipole moment?
(A) NH3
(B) CFICei
(C) H2O
(D) BF3
The most stable elements are
(A) Halogens
(B) Lithium family
(C) Noble gases
(D) None of these
Bond angle (I) in case of ammonia molecule is
(A) 105°
(B) 107.5°
(C) 120°
(D) 180°
The number of bonds in oxygen molecule is
(A) One a and one 7
(B) One a and two 7
(C) Three sigma only
(D) Two sigma only
In dry ice CO2 molecules form
(A) Ionic crystals
(B) Covalent crystals
(C) Molecular crystals
(D) Any type of crystals
Escape out of gas molecules one by one through tiny hole is
(A) Diffusion
(B) Effusion
(C) Osmosis
(D) All of these
, 3
Angstrom is the unit of
(A) Time
(B) Lengthy
(A) Mass
(A) Frequency
Largest number of molecules are in
(A) 3.6 gmH20
(B) 4.8 gm C2H5OH
(C) 2.8 gm CO
(D) 5.8 gm N205
Which molecule has zero dipole moment?
(A) NH3
(B) CHC 3
(C) H2O
(D) BF3
An orbital which is spherical and symmetrical is
(A) s-orbital
(B) p-orbital
(A) d-orbital
(A) f-orbital
Quantum number values for 21 orbitals are
(A) n = 2, = 1
(B) n = 1, = 2
(C) n = 1, =0
(D) n = 2, t =0
The four equivalents SP3 hybrid orbitals in space are at an angle of
(A) 120°
(B) 107.5°
(C) 104.5°
(D) 109.5°
The nature of positive rays depends on
(A) The nature of electrode
(B) The nature of discharge tube
(C) The nature of residual gas
(D) The temperature
Cathode in NICAD is
(A) Ag2O
(B) N102
(C) Cd
(D) Zn
Cathode rays strike alumina and produce a colour
(A) Red
(B) Blue
(C) Yellow
(D) Green
Positive ions are called
(A) cations
(B) Annions
(C) Molecules
(D) Hydrated ions
The —e value for the positive rays is maximum for
(A) Hydrogen
(B) Helium
(C) Oxygen
