Chemistry MCQ (Multiple Choice Questions) - SchoolingAxis

Chemistry MCQ (Multiple Choice Questions)

 Que- If internal energy of the system is increased ____________________? 

a. Change in state of the system is increased  

b. Temperature of the ystem may rise  

c. Chemical reaction may take place  

d. All 

Answer- All

Que- A reaction has values of ?H and ?S which are both positive. The reaction __________________? 

a. Is spontaneous  

b. Spontaneity is temperature dependent  

c. Has an increasing free energy  

d. Is non-spontaneous 

Answer- Is non-spontaneous

Que- The environment in which a system is studied is __________________? 

a. State function  

b. phase  

c. surrounding  

d. state 

Answer- surrounding

Que- Anything which depends upon initial and final state of a system is_______________? 

a. environment  

b. surrounding  

c. state function  

d. enthalpy 

Answer- state function

Que- Reaction in which heat evolves is called ____________________? 

a. endothermic  

b. spontaneous  

c. non-spontaneous  

d. exothermic 

Answer- exothermic

Que- Pumping of water uphill is_______________? 

a. spontaneous process  

b. non-spontaneous process  

c. irreversible process  

d. reversible process 

Answer- non-spontaneous process

Que- Which one of the following is a state function ________________? 

a. pressure  

b. temperature  

c. enthalpy  

d. all of the above 

Answer- all of the above

Que- Enthalpy of a reaction can be measured by ____________________? 

a. glass calorimeter  

b. manometer  

c. Barometer  

d. thermometer 

Answer- glass calorimeter

Que- Most of thermodynamic parameters are_________________? 

a. system  

b. surrounding  

c. phase  

d. state functions 

Answer- state functions

Que- Two fundamental ways to transfer energy are________________? 

a. pressure and temperature  

b. pressure and volume  

c. heat and work  

d. heat and volume 

Answer- heat and work

Que- Enthalpy change can be_________________? 

a. calculated by Hess law  

b. can be measured by calorimeter  

c. both A and B  

d. none 

Answer- both A and B

Que- Enthalpy of combustion for food fuel and other compounds can be measured accurately by________________? 

a. glass calorimeter  

b. bomb calorimeter  

c. thermometer  

d. manometer 

Answer- bomb calorimeter

Que- When enthalpy of reactants is higher than product then reaction will be_________________? 

a. endothermic  

b. spontaneous  

c. non-spontaneous  

d. exothermic 

Answer- exothermic

Que- State function the macroscopic property of system depends upon________________? 

a. path of reaction  

b. initial state  

c. final state  

d. initial and final state 

Answer- initial and final state

Que- CuSO4 + Zn?ZnSO4+Cu is___________________? 

a. Spontaneous reaction  

b. Non-spontaneous reaction  

c. Endothermic  

d. Exothermic 

Answer- Spontaneous reaction

Que- Total energy of a system is_________________? 

a. P.E + K.E  

b. P.E + heat energy  

c. K.E + heat energy  

d. P.E + mechanical energy 

Answer- P.E + K.E

Que- Unit of heat in SI system is________________? 

a. J  

b. KCaL  

c. Cal  

d. GJ 

Answer- J

Que- ________________ is study about energy of a chemical system ? 

a. thermochemistry  

b. thermodynamics  

c. chemical kinetics  

d. stoichiometry 

Answer- thermochemistry

Que- Which of the following has strongest intermolecular forces of attraction ? 

a. Hydrogen (H2)  

b. Chlorine (Cl2)  

c. lodine (I2)   

d. Methane (CH4) 

Answer- lodine (I2) 

Que- When substance moves from a solid to a liquid state all of the following changes occur except__________________? 

a. Molecules become more disordered  

b. K.E of the molecules decreases  

c. Intermolecular forces become weaker  

d. Molecule become further separated 

Answer- K.E of the molecules decreases

Que- 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. Between 200 torr and 760 torr  

c. 765 torr  

d. any value of pressure 

Answer- Between 760 torr and 1200 torr

Que- Vapour pressure of water at 100°C is___________________? 

a. 55 mm Hg  

b. 760 mm Hg  

c. 355 mm Hg  

d. 1489 mm Hg 

Answer- 760 mm Hg

Que- Liquid crystal is discovered by __________________? 

a. William Crooks  

b. Fredrack Reinitzer  

c. J.J Thomson  

d. Bravis 

Answer- Fredrack Reinitzer

Que- Hydrogen bonding is involved in____________________? 

a. Solubility  

b. Cleansing action of detergents  

c. Biological molecules  

d. All 

Answer- All

Que- Forces of attraction which may be present between all kinds of atoms and molecules are _____________________? 

a. intramolecular  

b. intermolecular  

c. van der Waal  

d. Dipole-induced dipole 

Answer- van der Waal

Que- 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. evaporation  

c. crystallization  

d. sublimation 

Answer- vaporization

Que- Water has maximum density at __________________? 

a. 0°C  

b. 2°C  

c. 4°C  

d. 100°C 

Answer- 4°C

Que- Formation of vapours from the surface of a liquid is called________________? 

a. vapourization  

b. evaporation  

c. condensation  

d. cracking 

Answer- evaporation

Que- 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. Ion dipole-dipole forces  

c. London dispersion forces  

d. Debye forces 

Answer- Dipole-dipole forces

Que- Vapour pressure is not affected by_______________? 

a. Surface area  

b. temperature  

c. intermolecular forces  

d. atmospheric pressure 

Answer- Surface area

Que- Table salt crystallizes with a______________________? 

a. Face centered cubic lattice  

b. body centered cubic lattice  

c. simple cubic lattice  

d. othorhombic lattice 

Answer- body centered cubic lattice

Que- During which process empty spaces between particles become minimum ? 

a. ionization  

b. condensation  

c. fusion  

d. evaporation 

Answer- condensation

Que- Which one of the following has highest volatility_________________? 

a. Diethyl ether  

b. Ethyl alcohol  

c. Water  

d. Ethylene glycol 

Answer- Diethyl ether

Que- If we provide very high amount of heat to a liquid its boiling point will__________________? 

a. increase  

b. remains constant  

c. decrease  

d. there will be no boiling 

Answer- remains constant

Que- A solid may be made up of_________________? 

a. Atoms  

b. Ions  

c. Molecules  

d. A, B, and C 

Answer- A, B, and C

Que- Amorphous substances posses_________________? 

a. No definite geometry  

b. No definite heat of fusion  

c. No sharp melting points  

d. All of the above 

Answer- No sharp melting points

Que- Boiling points of hydrocarbons increase with the increase in number of carbon atoms. It is mainly due to_________________? 

a. More strength of H-bonding  

b. More strength of London forces  

c. Less polarizability  

d. All of the above 

Answer- More strength of London forces

Que- The phenomenon in which a compound exists in two or more crystalline forms is called ________________? 

a. Isomorphism  

b. Polymorphism  

c. Anisotropy  

d. Allotropy 

Answer- Polymorphism

Que- Bucky balls is an allotropic from of__________________? 

a. Sulphur  

b. Carbon  

c. Silica  

d. Tin 

Answer- Carbon

Que- Isomorphic substances have _______________? 

a. Same physical and chemical properties  

b. Same physical and different chemical properties  

c. Different physical and same chemical properties  

d. Different physical and chemical properties 

Answer- Different physical and chemical properties

Que- The pressure during the molar heat of fusion is kept________________? 

a. 0 atmosphere  

b. one atmosphere  

c. 2 atmosphere  

d. 10 atmosphere 

Answer- one atmosphere

Que- All the enthalpy changes are________________? 

a. Negative  

b. Positive  

c. May or may not be A or B  

d. none 

Answer- May or may not be A or B

Que- Which has strongest bonding in the solid state ? 

a. Hydrogen Chloride (HCI)  

b. Chlorine (Cl2)  

c. Xenon(Xe)  

d. Sodium Chloride (NaCI) 

Answer- Sodium Chloride (NaCI)

Que- 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. ABCABC (Cubic)  

c. Orthor hombic  

d. Rhombohedral 

Answer- ABAB (hexagonal)

Que- Which one is false for evaporation ? 

a. Surface phenomenon  

b. Continuous  

c. Exothermic  

d. Cause cooling 

Answer- Exothermic

Que- Which one of the following does not show hydrogen bonding? 

a. Water  

b. Ethyl alcohol  

c. Phenol  

d. Diethyl ether 

Answer- Diethyl ether

Que- Which one is a conductor but is not malleable ? 

a. Iron  

b. Graphite  

c. Silver  

d. Platinum 

Answer- Graphite

Que- The density of water may be__________________? 

a. Equal to that of ice  

b. Greater than that of ice  

c. Less than that of ice  

d. All are possible 

Answer- Greater than that of ice

Que- Steam causes more sever burn than the boiling water because it possesses _________________? 

a. Latent heat of fusion  

b. Latent heat of vaporization  

c. Latent heat of sublimation  

d. All of the above 

Answer- Latent heat of vaporization

Que- The conversion of vapours back into their liquid state is called__________________? 

a. crystallization  

b. evaporization  

c. vaporization  

d. condensation 

Answer- condensation

Que- When water freezes at 0°C its density decreases due to_______________? 

a. Change of bond angles  

b. Cubic structure of ice  

c. Empty space present in the structure of ice  

d. Change of bond length 

Answer- Empty space present in the structure of ice

Que- The boiling point increases down the zero group element due to_________________? 

a. Ion dipole forces  

b. London forces  

c. Hydrogen bonding  

d. Dipole dipole forces 

Answer- London forces

Que- Rising of a wetting liquid in a capillary tube is due to__________________? 

a. Surface tension  

b. Cohesive forces  

c. Adhesive forces  

d. viscosity 

Answer- Adhesive forces

Que- The number of formula units in 29.25g of common salt_________________? 

a. 6.022 x 1023  

b. 3.01 x 1023  

c. 2 x NA  

d. 4 x 6.022 x 1023 

Answer- 3.01 x 1023

Que- Liquid gets the shape of the container when it is poured into it. Which one of the following reasons justifies it ? 

a. Liquid do not have definite shape  

b. Liquid do not have definite volume  

c. Lieuid is highly compressible  

d. Liquid molecules can slide over each other 

Answer- Liquid molecules can slide over each other

Que- Molar heat of vaporization of water is_________________? 

a. 40.7 KJ/mole  

b. 40.7 J/mole  

c. 40.7 cal/mole  

d. 40.7 Kcal/mole 

Answer- 40.7 KJ/mole

Que- Crystallites are present in_________________? 

a. crystalline solids  

b. amorphous solids  

c. liquid crystals  

d. all of the above 

Answer- amorphous solids

Que- A malleable solid is one which can be_________________? 

a. Converted into wires  

b. Converted into thin sheets  

c. Melted easily  

d. All of the above 

Answer- Converted into thin sheets

Que- Crystalline solids can be identified easily from their ___________________? 

a. Sharp melting point  

b. Definite geometry  

c. Transition temperature  

d. Colour 

Answer- Sharp melting point

Que- The viscosity of solids is________________? 

a. Infinite  

b. Negligible  

c. Medium  

d. No concept of viscosity in solid 

Answer- Infinite

Que- Which solids are called true solids _______________? 

a. Metallic  

b. Amorphous  

c. Crystalline  

d. Vitreous 

Answer- Crystalline

Que- The number amino acid units for each turn of helix on average are____________________? 

a. 21  

b. 23  

c. 25  

d. 27 

Answer- 27

Que- If a physical and chemical change takes place at a constant pressure then the heat change during the process is called__________________? 

a. Heat of transition  

b. Heat of fusion  

c. Enthalpy change  

d. All of above 

Answer- Enthalpy change

Que- The amount of heat absorbed when one mole of a liquid is changed into gas at its boiling point is_____________________? 

a. Molar heat of sublimation  

b. Molar heat of fusion  

c. Molar heat of vapourization  

d. Latent heat of that liquid 

Answer- Molar heat of vapourization

Que- 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. Electrons revolve in discrete circular orbits  

c. Energy of each electron is directly proportional to n2  

d. Electrons radiate energy continuously in a given orbit. 

Answer- Electrons radiate energy continuously in a given orbit.

Que- The magnetic quantum number (QN) has its values determined directly by the value of_______________? 

a. Principal (QN)  

b. Azimuthal (QN)  

c. Spin (QN)  

d. Both A & B 

Answer- Azimuthal (QN)

Que- The maximum number of electron in a sub shell with ? = 3fs______________? 

a. 6  

b. 10  

c. 14  

d. 18 

Answer- 14

Que- When an atom absorbs energy the lines in the spectrum will appear which are_________________? 

a. Brighter  

b. Darker  

c. Colourless  

d. Hard to locate 

Answer- Darker

Que- Which one is not true about cathode rays ? 

a. 9.11×10-31 Kg  

b. Cast shadow  

c. Heat up the platinum foil  

d. Cannot ionize 

Answer- Cannot ionize

Que- Rutherfords planet like structure was defective and unsatisfactory because_________________? 

a. Moving e- accelerate towards the nucleus  

b. Continuous spectrum  

c. behavior of electron remain unexplained  

d. all 

Answer- all

Que- Splitting of spectral lines when atom is subjected to magnetic field is called _______________? 

a. Zeemans effect  

b. Starks effect  

c. Photo electric effect  

d. Compton effect 

Answer- Zeemans effect

Que- Which one of the following explain the shape of orbitals _________________? 

a. Principal of quantum number  

b. Azimuthal quantum number  

c. Magnetic quantum number  

d. Spin quantum number 

Answer- Azimuthal quantum number

Que- Pressure in gas discharge tube was kept________________? 

a. 10 torr  

b. 1 torr  

c. 0.1 torr  

d. 0.01 torr 

Answer- 0.01 torr

Que- Angle of deflection was studied by________________? 

a. Hitorff  

b. Stoney  

c. William Crookes  

d. J.Perrin 

Answer- J.Perrin

Que- Positive rays give flash on________________? 

a. AgNO3 plate  

b. AgCl plate  

c. ZnO  

d. ZnS 

Answer- ZnS

Que- The value of e/m ratio of electron is________________? 

a. 6.02 x 1023 C/kg  

b. 1.7588 x 1020 C/kg  

c. 9.1095 x 10-31 C/kg  

d. 1.7588 x 1011 C/kg 

Answer- 1.7588 x 1011 C/kg

Que- Planks theory says energy is emitted__________________? 

a. In continuous manner  

b. Discontinuous manner  

c. Simultaneously  

d. In the form of heat 

Answer- Discontinuous manner

Que- 2nd orbit is ___________ away from nucleus of H-atom as compared to 1st orbit is ? 

a. 2-times  

b. 3-times  

c. 4-times  

d. 6 times 

Answer- 4-times

Que- The correct electronic configuration of Cu is ___________________? 

a. [Ar]4s1  

b. [Ar]4s2  

c. [Ar]3d104s1  

d. [Ar]3d94s2 

Answer- [Ar]3d104s1

Que- Atomic orbits having same energy are called________________? 

a. Degenerate orbitals  

b. Bonding molecular orbitals  

c. Anti bonding molecular orbitals  

d. Half filled orbitals 

Answer- Degenerate orbitals

Que- When electrons collide with heavy metals than ___________ are produced? 

a. Beta-rays  

b. Alpha-rays  

c. X-rays  

d. Gamma-rays 

Answer- X-rays

Que- Atom with higher atomic number produces X-rays of__________________? 

a. Shorter wavelength  

b. Larger wavelength  

c. X-ray not produced  

d. All are possible 

Answer- Shorter wavelength

Que- Space around nucleus where finding probability of electrons is maximum is called ____________________? 

a. Orbital  

b. Orbit is elliptical  

c. subshell  

d. Electron cloud 

Answer- Orbital

Que- Electronic configuration of K is_________________? 

a. [Ar]4s2  

b. [Ar]4s1  

c. [Kr]5s1  

d. [He]2s1 

Answer- [Ar]4s1

Que- Milikan used ______________ in his atomizer? 

a. Milk  

b. Honey  

c. Oil  

d. Water 

Answer- Oil

Que- Spectrum is produced due to________________? 

a. Different wavelength  

b. Different colours  

c. Different intensities  

d. all have little contribution 

Answer- Different wavelength

Que- When electron jump into orbit 1 then series obtained is___________________? 

a. Lyman  

b. Paschen  

c. Pfund  

d. Brackett 

Answer- Lyman

Que- Splitting of spectral lines when atoms are subjected to strong electric filed is called_________________? 

a. Zeeman effect  

b. Stark effect  

c. Photoelectric effect  

d. Compton effect 

Answer- Stark effect

Que- Three quantum number have been derived from equation of____________________? 

a. de-Broglie  

b. Plancks  

c. Schrodinger  

d. Heisenberg 

Answer- Schrodinger

Que- The letters s p d and f are used to represent which quantum numbers________________? 

a. Principal  

b. Azimuthal  

c. Magnetic  

d. Spin 

Answer- Azimuthal

Que- The atomic number of an element having maximum number of unpaired electrons in p-subshell is_______________? 

a. 7  

b. 10  

c. 12  

d. 16 

Answer- 7

Que- Colour of fluorescene produced by cathode rays depends upon________________? 

a. Temperature  

b. Pressure  

c. Volume  

d. Composition of glass 

Answer- Composition of glass

Que- Positive rays are produced__________________? 

a. By burning of gas  

b. By cooling of the gas  

c. By the bombardment of cathode rays on gas molecules  

d. From anode like cathode rays produced from cathode 

Answer- By the bombardment of cathode rays on gas molecules

Que- The relationship between energy of a photon of light and its frequency is given by________________? 

a. de-Broglie duel nature of matter  

b. Bohrs model  

c. Plancks Quantum theory  

d. Rutherfords atomic model 

Answer- Plancks Quantum theory

Que- The velocity of the photon____________________? 

a. Is independent of wavelength  

b. Depends upon source  

c. Depends upon its frequency  

d. Equals to the square of amplitude 

Answer- Is independent of wavelength

Que- Atom cannot be divided into simple unitstheorized by________________? 

a. Rutherford  

b. Dalton  

c. Bohr  

d. Schrodinger 

Answer- Dalton

Que- The number of fundamental particles in an atom of the lightest isotope carbon are_______________? 

a. 6  

b. 12  

c. 18  

d. 20 

Answer- 18

Que- Increase in atomic number is observed during_________________? 

a. Alpha emission  

b. Beta emission  

c. Both A & B  

d. Radioactivity 

Answer- Beta emission

Que- Free neutron changes into proton with the emission of__________________? 

a. Neutrino  

b. Electron  

c. Both A & B  

d. Meson 

Answer- Both A & B

Que- Charge of electron was measured by__________________? 

a. J.J Thomson  

b. Millikan  

c. Rutherford  

d. Perrin 

Answer- Millikan

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