Que- Diameter of an atom is in the order of:
a. 2m
b. 2mm
c. 2nm
d. 2pm
Answer- 2nm
Que- Which of the following are isoelectronic species?
a. H+ H H-
b. Li+ Na+ K+
c. C1- Br- I
d. F- Ne Na+
Answer- F- Ne Na+
Que- Mass spectrometer is used to determine Mass number of isotopes and
a. Atomic number
b. Relative abundance
c. Electronic configuration
d. All of the above
Answer- Relative abundance
Que- The number of peaks obtained in mass spectrometry shows
a. Relative abundance
b. Average mass of element
c. Number of isotopes
d. Relative isotopic mass
Answer- Number of isotopes
Que- Empirical formula of chloroform is
a. CH2 C12
b. CH3C1
c. CC14
d. CHC13
Answer- CHC13
Que- Which one is true about isotope?
a. Same number of neutrons
b. Same mass number
c. Same physical properties
d. Same chemical properties
Answer- Same chemical properties
Que- Molecular mass of water (18g) means
a. 1-mole molecules of water
b. 1-gram molecule of water
c. 3-gram atoms
d. all
Answer- all
Que- Which of the following ion formation is always exothermic?
a. Uni-negative
b. Uni-positive
c. Di-negative
d. Di-positive
Answer- Uni-negative
Que- Which of the following statements about isotopes is correct?
a. Isotopes with odd atomic number are abundant
b. Isotopes with odd atomic number and even mass number are abundant
c. Isotopes with even atomic number and even mass number are abundant
d. Isotopes with even atomic number and odd mass no are abundant
Answer- Isotopes with even atomic number and even mass number are abundant
Que- The sample of isotopes of an element which needs not to be vaporized in the vaporization chamer
a. Gas
b. Liquid
c. Volatile solid
d. All
Answer- Gas
Que- One mole of CO2 contains.
a. 022 x 1023 atoms of oxygen
b. 22-gram electrons
c. 022 x 1023 atms of carbon
d. both b & c
Answer- both b & c
Que- Avogadros number may represent
a. volume of particles
b. number of particles
c. mass of particles
d. All of the above
Answer- All of the above
Que- The number of isotopes of elements with even mass number and even atomic number are.
a. 280
b. 300
c. 154
d. 54
Answer- 154
Que- Size of molecule depends upon
a. Atomicity
b. Shape of molecule
c. Both a and b
d. Difficult to predict
Answer- Both a and b
Que- Which of the following terms is not used for ionic compound?
a. formula unit
b. empirical formula
c. molecular formula
d. formula mass
Answer- molecular formula
Que- 36 moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is
a. 18 mole
b. 27 mole
c. 24 mole
d. 09 mole
Answer- 18 mole
Que- Which of the following terms is used for the mass of chlorine 35.5?
a. relative atomic mass
b. mass number
c. atomic weight
d. relative isotopic mass
Answer- relative atomic mass
Que- Which one of the following has the maximum number of isotopes?
a. oxygen
b. carbon
c. tin
d. chlorine
Answer- tin
Que- Which one of the following is not the mono isotopic element?
a. arsenic
b. uranium
c. iodine
d. nickel
Answer- uranium
Que- The volume occupied by 2.8 g of N2 at STP
a. 24 dm3
b. 4 dm3
c. 12 dm3
d. 112 dm3
Answer- 24 dm3
Que- The mass of decimole of electrons (NA) is
a. 008 mg
b. 184 mg
c. 054 mg
d. 4 mg
Answer- 054 mg
Que- The number of moles of CO2 which contains 16 g of oxygen is
a. 25
b. 5
c. 75
d. 1
Answer- 5
Que- Which of the following statements is wrong about isotopes?
a. they possess different mass number
b. they possess different physical properties
c. they possess same chemical properties
d. they possess different position in the periodic table
Answer- they possess different position in the periodic table
Que- How many isotopes have odd atomic number?
a. 154
b. 280
c. 86
d. 300
Answer- 86
Que- Qualitative analysis is carried out for
a. identification of elements
b. estimation of amounts of elements
c. molar ration of elements
d. molar volume of elements
Answer- identification of elements
Que- Percentage of calcium in calcium carbonate is
a. 80%
b. 30%
c. 40%
d. 20%
Answer- 40%
Que- Combustion analysis is performed to determine
a. Empirical formula
b. Molecular mass
c. Molecular formula
d. Formula mass
Answer- Empirical formula
Que- Mostly elements have fractional atomic masses because of
a. mass of an atom itself is in fraction
b. atomic masses are average masses of isobars
c. atmoic masses are average masses of isotopes proportional to their relative abundance
d. atmoic masses are average masses of isotopes
Answer- atmoic masses are average masses of isotopes proportional to their relative abundance
Que- Isotopes differ in
a. properties which depend upon mass
b. arrangement of electrons in orbitals
c. chemical properties
d. all of the above
Answer- properties which depend upon mass
Que- Which of the following is not a macromolecule?
a. sand
b. haemoglobin
c. diamond
d. maltose
Answer- maltose
Que- Which of the following methods is used to estimate hydrogen in an organic compound?
a. Combustion method
b. Dumas method
c. Kjeldahls method
d. All of the above methods are for different purposes
Answer- Combustion method
Que- Isotopes of the same elements has
a. different number of protons
b. same number of neutrons
c. different number of neutrons
d. same mass number (nucleon number)
Answer- different number of neutrons
Que- The nucleus of an atom of every element will always contain
a. neutrons
b. protons and electrons
c. protons
d. protons and neutrons
Answer- protons
Que- When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen
a. lighter
b. intermediate
c. heavier
d. are collected at same time
Answer- lighter
Que- When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether?
a. 5
b. 1
c. 5
d. 2
Answer- 2
Que- For which of the following compounds the term empirical formula cannot be applied?
a. NaCl
b. H2O
c. CCI4
d. It can be applied to all mentioned above
Answer- It can be applied to all mentioned above
Que- Dempsters mass spectrometer has number of zones / parts
a. 5
b. 4
c. 3
d. 2
Answer- 5
Que- The properties of an element mosly corresponds to that isotope which has greater
a. Mass number
b. Atomic mass
c. Relative abundance
d. all of the above
Answer- Relative abundance
Que- 1 a.m.u =
a. 6 x 10-27 kg
b. 6 x 10-24 kg
c. 6 x 10-26 kg
d. 6 x 10-28 kg
Answer- 6 x 10-27 kg
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 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 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- 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- Colour of fluorescene produced by cathode rays depends upon
a. Temperature
b. Pressure
c. Volume
d. Composition of glass
Answer- Composition of glass
Que- Which one is not true about cathode rays?
a. 11x10-31 Kg
b. Cast shadow
c. Heat up the platinum foil
d. Cannot ionize
Answer- Cannot ionize
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- 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- 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- 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- 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- 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- Atom cannot be divided into simple unitstheorized by
a. Rutherford
b. Dalton
c. Bohr
d. Schrodinger
Answer- Dalton
Que- Pressure in gas discharge tube was kept
a. 10 torr
b. 1 torr
c. 1 torr
d. 01 torr
Answer- 01 torr
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- Angle of deflection was studied by
a. Hitorff
b. Stoney
c. William Crookes
d. J.Perrin
Answer- J.Perrin
Que- Increase in atomic number is observed during
a. Alpha emission
b. Beta emission
c. Both a & b
d. Radioactivity
Answer- Beta emission
Que- Positive rays give flash on
a. AgNO3 plate
b. AgCl plate
c. ZnO
d. ZnS
Answer- ZnS
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- The value of e/m ratio of electron is
a. 02 x 1023 C/kg
b. 7588 x 1020 C/kg
c. 1095 x 10-31 C/kg
d. 7588 x 1011 C/kg
Answer- 7588 x 1011 C/kg
Que- Charge of electron was measured by
a. J.J Thomson
b. Millikan
c. Rutherford
d. Perrin
Answer- Millikan
Que- Rutherford bombarded ______________ particles in discovery of nucleus
a. Gamma-rays
b. Alpha-rays
c. Beta-rays
d. X-rays
Answer- Alpha-rays
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 maximum number of orbitals present in a subshell that is represented by Azimuthal quantum number = 3 will be
a. 1
b. 3
c. 5
d. 7
Answer- 7
Que- The correct electronic configuration of Cu is
a. [Ar]4s1
b. [Ar]4s2
c. [Ar]3d104s1
d. [Ar]3d94s2
Answer- [Ar]3d104s1
Que- Pfund series are produced in the spectrum of hydrogen atom
a. when electrons jump down to 2nd- orbit
b. when electrons jump down to 3rd- orbit
c. when electrons jump down to 4th- orbit
d. when electrons jump down to 5th- orbit
Answer- when electrons jump down to 5th- orbit
Que- Atomic orbits having same evergy are called
a. Degenerate orbitals
b. Bonding molecular orbitals
c. Anti bonding molecular orbitals
d. Half filled orbitals
Answer- Degenerate orbitals
Que- Sommerfelds modification in Bohrs model is
a. Orbit is cylindrical
b. Orbit is elliptical
c. Orbit is longitudinal
d. Orbit is asymmetrical
Answer- Orbit is elliptical
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- Wavelength of electron was verified by
a. Moseley
b. Davisson and Germer
c. Einstein
d. Roentgen
Answer- Davisson and Germer
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- Quantum number which tells the energy of electron is
a. n
b. 1
c. m
d. s
Answer- n
Que- Electronic configuration of K is
a. [Ar]4s2
b. [Ar]4s1
c. [Kr]5s1
d. [He]2s1
Answer- [Ar]4s1
Que- ____________ can expel proteons from paraffins
a. Electron
b. Positron
c. Neutron
d. None of above has such capability
Answer- Neutron
Que- Milikan used __________ in his atomizer
a. Milk
b. Honey
c. Oil
d. Water
Answer- Oil
Que- Centrifugal forces are balanced in atom by
a. Attractive forces
b. Repulsive force
c. Electrons
d. Neutrons
Answer- Attractive forces
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 6d orbital is complete the entering electron goes into
a. 7f
b. 7s
c. 7p
d. 7d
Answer- 7p
Que- When electron jump into orbit 1 then series obtained is
a. Lyman
b. Paschen
c. Pfund
d. Brackett
Answer- Lyman
Que- Neutrons moving with an energy of 1.2 MeV are called
a. Fast neutrons
b. Slow neutrons
c. Moderate neutrons
d. All are possible
Answer- Fast neutrons
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- 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- 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 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- 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- In order to mention the boiling point of water at 110 Degree Centigrade 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- Which one is false for evaporation?
a. Surface phenomenon
b. Continuous
c. Exothermic
d. Cause cooling
Answer- Exothermic
Que- Vapour pressure of water at 100 Degree Centrigrade is
a. 55 mm Hg
b. 760 mm Hg
c. 355 mm Hg
d. 1489 mm Hg
Answer- 760 mm Hg
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- Liquid crystal is discovered by
a. William Crooks
b. Fredrack Reinitzer
c. J.J Thomson
d. Bravis
Answer- Fredrack Reinitzer
Que- Which one is a conductor but is not malleable?
a. Iron
b. Graphite
c. Silver
d. Platinum
Answer- Graphite
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 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- 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- 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- Water has maximum density at
a. 0Degree Centigrade
b. 2Degree Centigrade
c. 4Degree Centigrade
d. 100Degree Centigrade
Answer- 4Degree Centigrade
Que- The conversion of vapours back into their liquid state is called
a. crystallization
b. evaporization
c. vaporization
d. condensation
Answer- condensation