Chemistry Mcqs – (Science) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests
“ Chemistry Mcqs “. Tab this page to check “Latest Chemistry MCQs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others. The most occurred mcqs of Chemistry in past papers. Past papers of Chemistry mcqs. Past papers of Chemistry MCQs. Chemistry Mcqs are the necessary part of any competitive / job related exams. The Chemistry mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Chemistry mcqs. The Important series of Chemistry Mcqs are given below:
In sp3 hybridization the expected geometry of molecules will be__________________?
A. trigonal pyramidal
B. square planar
C. tetrahedral
D. linear
In cyano group the carbon atom shows which kind of hybridization___________________?
A. sp3
B. sp
C. sp2
D. none of the above
The fractional distillation of petroleum produces gasoline up to ________________?
A. 15%
B. 10%
C. 20%
D. 30%
Which is not heterocyclic compound _______________?
A. Thiophene
B. Furan
C. Aniline
D. Pyridine
Which one is not state function ________________?
A. Enthalpy
B. Internal energy
C. Gibbs free energy
D. Work
If internal energy of the system is increased ____________________?
A. Change in state of the system is increased
B. Chemical reaction may take place
C. Temperature of the ystem may rise
D. All
A reaction has values of ?H and ?S which are both positive. The reaction __________________?
A. Has an increasing free energy
B. Spontaneity is temperature dependent
C. Is spontaneous
D. Is non-spontaneous
The environment in which a system is studied is __________________?
A. phase
B. State function
C. surrounding
D. state
Anything which depends upon initial and final state of a system is_______________?
A. surrounding
B. environment
C. state function
D. enthalpy
Reaction in which heat evolves is called ____________________?
A. spontaneous
B. endothermic
C. non-spontaneous
D. exothermic
Pumping of water uphill is_______________?
A. irreversible process
B. non-spontaneous process
C. spontaneous process
D. reversible process
Which one of the following is a state function ________________?
A. temperature
B. pressure
C. enthalpy
D. all of the above
Enthalpy of a reaction can be measured by ____________________?
A. glass calorimeter
B. Barometer
C. manometer
D. thermometer
Most of thermodynamic parameters are_________________?
A. surrounding
B. system
C. phase
D. state functions
Two fundamental ways to transfer energy are________________?
A. pressure and volume
B. pressure and temperature
C. heat and work
D. heat and volume
Enthalpy change can be_________________?
A. can be measured by calorimeter
B. calculated by Hess law
C. both A and B
D. none
Enthalpy of combustion for food fuel and other compounds can be measured accurately by________________?
A. thermometer
B. bomb calorimeter
C. glass calorimeter
D. manometer
When enthalpy of reactants is higher than product then reaction will be_________________?
A. endothermic
B. non-spontaneous
C. spontaneous
D. exothermic
State function the macroscopic property of system depends upon________________?
A. path of reaction
B. final state
C. initial state
D. initial and final state
CuSO4 + Zn?ZnSO4+Cu is___________________?
A. Spontaneous reaction
B. Endothermic
C. Non-spontaneous reaction
D. Exothermic
Total energy of a system is_________________?
A. P.E + K.E
B. K.E + heat energy
C. P.E + heat energy
D. P.E + mechanical energy
Unit of heat in SI system is________________?
A. J
B. Cal
C. KCaL
D. GJ
________________ is study about energy of a chemical system ?
A. thermochemistry
B. chemical kinetics
C. thermodynamics
D. stoichiometry
Which of the following has strongest intermolecular forces of attraction ?
A. Chlorine (Cl2)
B. Hydrogen (H2)
C. lodine (I2)
D. Methane (CH4)
When substance moves from a solid to a liquid state all of the following changes occur except__________________?
A. Intermolecular forces become weaker
B. K.E of the molecules decreases
C. Molecules become more disordered
D. Molecule become further separated
In order to mention the boiling point of water at 110°C the external pressure should be ?
A. Between 760 torr and 1200 torr
B. 765 torr
C. Between 200 torr and 760 torr
D. any value of pressure
Vapour pressure of water at 100°C is___________________?
A. 355 mm Hg
B. 760 mm Hg
C. 55 mm Hg
D. 1489 mm Hg
Liquid crystal is discovered by __________________?
A. J.J Thomson
B. Fredrack Reinitzer
C. William Crooks
D. Bravis
Hydrogen bonding is involved in____________________?
A. Biological molecules
B. Cleansing action of detergents
C. Solubility
D. All
Forces of attraction which may be present between all kinds of atoms and molecules are _____________________?
A. intermolecular
B. intramolecular
C. van der Waal
D. Dipole-induced dipole
The quantity of heat required to convert one mole of liquid into its vapours at its boiling point is called molar heat of__________________?
A. vaporization
B. crystallization
C. evaporation
D. sublimation
Water has maximum density at __________________?
A. 2°C
B. 0°C
C. 4°C
D. 100°C
Chemistry Mcqs
Formation of vapours from the surface of a liquid is called________________?
A. condensation
B. evaporation
C. vapourization
D. cracking
The ttractive forces between the partial positive end of one molecule and partial negative end of other molecule are called________________?
A. Dipole-dipole forces
B. London dispersion forces
C. Ion dipole-dipole forces
D. Debye forces
Vapour pressure is not affected by_______________?
A. Surface area
B. intermolecular forces
C. temperature
D. atmospheric pressure
Table salt crystallizes with a______________________?
A. simple cubic lattice
B. body centered cubic lattice
C. Face centered cubic lattice
D. othorhombic lattice
During which process empty spaces between particles become minimum ?
A. fusion
B. condensation
C. ionization
D. evaporation
Which one of the following has highest volatility_________________?
A. Diethyl ether
B. Water
C. Ethyl alcohol
D. Ethylene glycol
If we provide very high amount of heat to a liquid its boiling point will__________________?
A. decrease
B. remains constant
C. increase
D. there will be no boiling
A solid may be made up of_________________?
A. Ions
B. Atoms
C. Molecules
D. A, B, and C
Amorphous substances posses_________________?0
A. No definite geometry
B. No definite heat of fusion
C. No sharp melting points
D. All of the above
Boiling points of hydrocarbons increase with the increase in number of carbon atoms. It is mainly due to_________________?
A. Less polarizability
B. More strength of London forces
C. More strength of H-bonding
D. All of the above
The phenomenon in which a compound exists in two or more crystalline forms is called ________________?
A. Anisotropy
B. Polymorphism
C. Isomorphism
D. Allotropy
Bucky balls is an allotropic from of__________________?
A. Silica
B. Carbon
C. Sulphur
D. Tin
Isomorphic substances have _______________?
A. Different physical and same chemical properties
B. Same physical and different chemical properties
C. Same physical and chemical properties
D. Different physical and chemical properties
The pressure during the molar heat of fusion is kept________________?
A. 2 atmosphere
B. one atmosphere
C. 0 atmosphere
D. 10 atmosphere
All the enthalpy changes are________________?
A. Positive
B. Negative
C. May or may not be A or B
D. none
Which has strongest bonding in the solid state ?
A. Chlorine (Cl2)
B. Hydrogen Chloride (HCI)
C. Xenon(Xe)
D. Sodium Chloride (NaCI)
When the atoms of third layer are arranged in such a way that they directly lie above the atoms of first layer then this arrangement is called_________________?
A. ABAB (hexagonal)
B. Orthor hombic
C. ABCABC (Cubic)
D. Rhombohedral
Which one is false for evaporation ?
A. Continuous
B. Surface phenomenon
C. Exothermic
D. Cause cooling
Which one of the following does not show hydrogen bonding?
A. Phenol
B. Ethyl alcohol
C. Water
D. Diethyl ether
Which one is a conductor but is not malleable ?
A. Silver
B. Graphite
C. Iron
D. Platinum
The density of water may be__________________?
A. Less than that of ice
B. Greater than that of ice
C. Equal to that of ice
D. All are possible
Steam causes more sever burn than the boiling water because it possesses _________________?
A. Latent heat of sublimation
B. Latent heat of vaporization
C. Latent heat of fusion
D. All of the above
The conversion of vapours back into their liquid state is called__________________?
A. evaporization
B. crystallization
C. vaporization
D. condensation
When water freezes at 0°C its density decreases due to_______________?
A. Cubic structure of ice
B. Change of bond angles
C. Empty space present in the structure of ice
D. Change of bond length
The boiling point increases down the zero group element due to_________________?
A. Hydrogen bonding
B. London forces
C. Ion dipole forces
D. Dipole dipole forces
Rising of a wetting liquid in a capillary tube is due to__________________?
A. Cohesive forces
B. Surface tension
C. Adhesive forces
D. viscosity
The number of formula units in 29.25g of common salt_________________?
A. 2 x NA
B. 3.01 x 1023
C. 6.022 x 1023
D. 4 x 6.022 x 1023
Liquid gets the shape of the container when it is poured into it. Which one of the following reasons justifies it ?
A. Liquid is highly compressible
B. Liquid do not have definite volume
C. Liquid do not have definite shape
D. Liquid molecules can slide over each other
Molar heat of vaporization of water is_________________?
A. 40.7 KJ/mole
B. 40.7 cal/mole
C. 40.7 J/mole
D. 40.7 Kcal/mole
Crystallites are present in_________________?
A. liquid crystals
B. amorphous solids
C. crystalline solids
D. all of the above
A malleable solid is one which can be_________________?
A. Melted easily
B. Converted into thin sheets
C. Converted into wires
D. All of the above
Crystalline solids can be identified easily from their ___________________?
A. Sharp melting point
B. Transition temperature
C. Definite geometry
D. Colour
The viscosity of solids is________________?
A. Infinite
B. Medium
C. Negligible
D. No concept of viscosity in solid
Which solids are called true solids _______________?
A. Amorphous
B. Metallic
C. Crystalline
D. Vitreous
The number amino acid units for each turn of helix on average are____________________?
A. 23
B. 21
C. 25
D. 27
If a physical and chemical change takes place at a constant pressure then the heat change during the process is called__________________?
A. Heat of fusion
B. Heat of transition
C. Enthalpy change
D. All of above
The amount of heat absorbed when one mole of a liquid is changed into gas at its boiling point is_____________________?
A. Molar heat of fusion
B. Molar heat of sublimation
C. Molar heat of vapourization
D. Latent heat of that liquid
All of the following were theorized by Bohr in his description of the atom except__________________?
A. Angular momentum of electrons in multiples of h/2?
B. Energy of each electron is directly proportional to n2
C. Electrons revolve in discrete circular orbits
D. Electrons radiate energy continuously in a given orbit.
The magnetic quantum number (QN) has its values determined directly by the value of_______________?
A. Spin (QN)
B. Azimuthal (QN)
C. Principal (QN)
D. Both A & B
The maximum number of electron in a sub shell with ? = 3fs______________?
A. 10
B. 6
C. 14
D. 18
When an atom absorbs energy the lines in the spectrum will appear which are_________________?
A. Colourless
B. Darker
C. Brighter
D. Hard to locate
Which one is not true about cathode rays ?
A. Cast shadow
B. 9.11×10-31 Kg
C. Heat up the platinum foil
D. Cannot ionize
Rutherfords planet like structure was defective and unsatisfactory because_________________?
A. Moving e- accelerate towards the nucleus
B. behavior of electron remain unexplained
C. Continuous spectrum
D. all
Splitting of spectral lines when atom is subjected to magnetic field is called _______________?
A. Zeemans effect
B. Photo electric effect
C. Starks effect
D. Compton effect
Which one of the following explain the shape of orbitals _________________?
A. Principal of quantum number
B. Azimuthal quantum number
C. Spin quantum number
D. Magnetic quantum number
Pressure in gas discharge tube was kept________________?
A. 1 torr
B. 10 torr
C. 0.1 torr
D. 0.01 torr
Angle of deflection was studied by________________?
A. Stoney
B. Hitorff
C. William Crookes
D. J.Perrin
Positive rays give flash on________________?
A. AgCl plate
B. AgNO3 plate
C. ZnO
D. ZnS
The value of e/m ratio of electron is________________?
A. 1.7588 x 1020 C/kg
B. 6.02 x 1023 C/kg
C. 9.1095 x 10-31 C/kg
D. 1.7588 x 1011 C/kg
Planks theory says energy is emitted__________________?
A. Simultaneously
B. Discontinuous manner
C. In continuous manner
D. In the form of heat
2nd orbit is ___________ away from nucleus of H-atom as compared to 1st orbit is ?
A. 3-times
B. 2-times
C. 4-times
D. 6 times
The correct electronic configuration of Cu is ___________________?
A. [Ar]4s2
B. [Ar]4s1
C. [Ar]3d104s1
D. [Ar]3d94s2
Atomic orbits having same energy are called________________?
A. Degenerate orbitals
B. Anti bonding molecular orbitals
C. Bonding molecular orbitals
D. Half filled orbitals
When electrons collide with heavy metals than ___________ are produced?
A. Alpha-rays
B. Beta-rays
C. X-rays
D. Gamma-rays
Atom with higher atomic number produces X-rays of__________________?
A. Shorter wavelength
B. X-ray not produced
C. Larger wavelength
D. All are possible
Space around nucleus where finding probability of electrons is maximum is called ____________________?
A. Orbital
B. Subshell
C. Orbit is elliptical
D. Electron cloud
Electronic configuration of K is_________________?
A. [Kr]5s1
B. [Ar]4s1
C. [Ar]4s2
D. [He]2s1
Milikan used ______________ in his atomizer?
A. Honey
B. Milk
C. Oil
D. Water
Spectrum is produced due to________________?
A. Different wavelength
B. Different intensities
C. Different colours
D. all have little contribution
When electron jump into orbit 1 then series obtained is___________________?
A. Lyman
B. Pfund
C. Paschen
D. Brackett
Splitting of spectral lines when atoms are subjected to strong electric filed is called_________________?
A. Photoelectric effect
B. Stark effect
C. Zeeman effect
D. Compton effect
Three quantum number have been derived from equation of____________________?
A. Plancks
B. de-Broglie
C. Schrodinger
D. Heisenberg
The letters s p d and f are used to represent which quantum numbers________________?
A. Magnetic
B. Azimuthal
C. Principal
D. Spin
The atomic number of an element having maximum number of unpaired electrons in p-subshell is_______________?
A. 7
B. 12
C. 10
D. 16
Colour of fluorescene produced by cathode rays depends upon________________?
A. Pressure
B. Temperature
C. Volume
D. Composition of glass
Positive rays are produced__________________?
A. By cooling of the gas
B. By burning of gas
C. By the bombardment of cathode rays on gas molecules
D. From anode like cathode rays produced from cathode
The relationship between energy of a photon of light and its frequency is given by________________?
A. Bohr’s model
B. De-Broglie duel nature of matter
C. Planck’s Quantum theory
D. Rutherford’s atomic model
The velocity of the photon____________________?
A. Is independent of wavelength
B. Depends upon its frequency
C. Depends upon source
D. Equals to the square of amplitude