Chemistry MCQ (Multiple Choice Questions) - SchoolingAxis

Chemistry MCQ (Multiple Choice Questions)

 Que-  Formation of vapours from the surface of a liquid is called 

a. vapourization 

b. evaporation 

c. condensation 

d. cracking 

Answer- evaporation

Que-  When water freezes at 0Degree Centigrade 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 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-  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-  Vapour pressure is not affected by 

a. Surface area 

b. temperature 

c. intermolecular forces 

d. atmospheric pressure 

Answer- Surface area

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-  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-  The number of formula units in 29.25g of common salt 

a. 022 x 1023 

b. 01 x 1023 

c. 2 x NA 

d. 4 x 6.022 x 1023 

Answer- 01 x 1023

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

a. ionization 

b. condensation 

c. fusion 

d. evaporation 

Answer- condensation

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-  Which one of the following has highest volatility 

a. Diethyl ether 

b. Ethyl alcohol 

c. Water 

d. Ethylene glycol 

Answer- Diethyl ether

Que-  Molar heat of vaporization of water is 

a. 7 KJ/mole 

b. 7 J/mole 

c. 7 cal/mole 

d. 7 Kcal/mole 

Answer- 7 KJ/mole

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-  Crystallites are present in 

a. crystalline solids 

b. amorphous solids 

c. liquid crystals 

d. all of the above 

Answer- amorphous solids

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-  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-  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-  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-  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-  Ice is ___________ crystal 

a. Metallic 

b. Molecular 

c. Covalent 

d. Ionic 

Answer- Molecular

Que-  Select a pair of compounds which are isomorphic in nature. 

a. NaCI and KNO3 

b. MgO and NaF 

c. KNO3 and MgO 

d. NaF and CaCO3 

Answer- MgO and NaF

Que-  The viscosity of solids is 

a. Infinite 

b. Negligible 

c. Medium 

d. No concept of viscosity in solid 

Answer- Infinite

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-  Which solids are called true solids? 

a. Metallic 

b. Amorphous 

c. Crystalline 

d. Vitreous 

Answer- Crystalline

Que-  Bucky balls is an allotropic from of 

a. Sulphur 

b. Carbon 

c. Silica 

d. Tin 

Answer- Carbon

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-  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-  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 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-  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 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-  What is the relative rate of effusion of CO and CO2? 

a. CO is 1.25 times faster than CO2 

b. CO is 3.75 times faster than CO2 

c. CO is 1.25 times faster than CO 

d. Both diffuse at the same rate 

Answer- CO is 1.25 times faster than CO2

Que-  Which of these gases diffuse more quickly than oxygen? 

a. H2S 

b. NO 

c. Cl2 

d. N2O 

Answer- NO

Que-  Which of the following is not considered as an intermolecular force between molecules? 

a. Coordinate covalent bonds 

b. Hydrogen bonds 

c. Debye forces 

d. London dispersion forces 

Answer- Coordinate covalent bonds

Que-  The weakest (in strength) of the following intermolecular forces is 

a. Hydrogen bonding 

b. Vander Waals force 

c. Forces among the polar molecules 

d. Ionic bond 

Answer- Vander Waals force

Que-  Ideal gasses have all the following characteristics except. 

a. Absence of intermolecular forces 

b. Collisions among the molecules of an ideal gas are perfectly elastic 

c. The molecules occupy no space 

d. All of the above are correct 

Answer- The molecules occupy no space

Que-  Which of the following statements is true about plasma 

a. It may be the first state of matter 

b. It is not a phase transition 

c. It is a conductor of electricity 

d. All of the above 

Answer- All of the above

Que-  Under what conditions the gases deviate from the ideal behavior? 

a. High temperature 

b. Low temperature 

c. High pressure 

d. b and c 

Answer- b and c

Que-  Which one has the lowest density at room temperature? 

a. Ne 

b. N2 

c. NH3 

d. CO 

Answer- NH3

Que-  The introduction of Kelvin scale in thermometry is according to 

a. Boyles law 

b. Charles law 

c. Daltons law 

d. Grahams law 

Answer- Charles law

Que- 5 mole of nitrogen gas and 0.5 mole of carbon monoxide gas at STP have same 

a. Value of a 

b. Mass 

c. Atoms 

d. Both b and C 

Answer- Both b and C

Que-  At constant temperature the pressure of an ideal gas is doubled its density becomes 

a. Half 

b. Double 

c. Same 

d. None 

Answer- Double

Que-  The diffusion of gases at absolute zero will be 

a. Unchanged 

b. Slightly decreased 

c. Slightly increased 

d. Zero 

Answer- Zero

Que-  Which of the following option is incorrect about gases? 

a. All molecules move with same speed 

b. All molecules behave independently 

c. PV / RT = n 

d. All gases cannot be liquefied through Linds Method 

Answer- All molecules move with same speed

Que-  Critical temperature for different gases is different and depends upon 

a. Size of molecule 

b. Shape of molecule 

c. Intermolecular attractions 

d. All of the above 

Answer- All of the above

Que-  In how many forms do matter exists? 

a. Three 

b. Four 

c. Five 

d. Two 

Answer- Four

Que-  What is the simplest form of matter? 

a. Gas 

b. Liquid 

c. Solid 

d. Semi solid 

Answer- Gas

Que-  What is the abundant form of matter on earth? 

a. Gas 

b. Liquid 

c. Solid 

d. Plasma 

Answer- Solid

Que-  Which state of matter has the lowest density? 

a. Gas 

b. Liquid 

c. Solid 

d. Plasma 

Answer- Gas

Que-  What do we call to sudden expansion of plasma? 

a. Avogadros law 

b. Grahams law of diffusion 

c. Joule Thompson effect 

d. Daltons law of partial pressure 

Answer- Joule Thompson effect

Que-  The solid particles only posses 

a. Translational motion 

b. Vibrational motion 

c. Rotational motion 

d. All of above motions 

Answer- Vibrational motion

Que-  For a gas where volume and pressures are 1dm3 and 2 atm respectively what should be its new volume when pressure is increased to 6 atm at constant temperature? 

a. 1/2dm3 

b. 1/3dm3 

c. 1/4dm3 

d. 2/3dm3 

Answer- 1/3dm3

Que-  If 1/V is plotted on X-axis and pressure on Y-axis at constant temperature what should appear 

a. Straight line parallel to x-axis 

b. Straight line parallel to y-axis 

c. Straight line 

d. Curve 

Answer- Straight line

Que-  Which one is the right value for R? 

a. 0821 atm dm3k-1mol- 

b. 0821 atm m3k-1mol-1 

c. 2 cal k-1 mol-1 

d. 314 Nm2k-1mol-1 

Answer- 0821 atm dm3k-1mol-

Que-  One mole of an ideal gas at 546.5 K under 2 atm pressure has a volume of 

a. 414 m3 

b. 828 dm3 

c. 414 dm3 

d. 212 cm3 

Answer- 414 dm3

Que-  The partial pressure exerted by the water vapours is called 

a. Surface tension 

b. Aqueous tension 

c. Vapour pressure 

d. Hydraulic pressure 

Answer- Aqueous tension

Que-  Which one is not the partial pressure of oxygen in the lungs? 

a. 1526 atm 

b. 116 mm of Hg 

c. 116 torr 

d. 1 atm 

Answer- 1 atm

Que-  The spreading of fragrance or scent in air is due to 

a. Diffusion 

b. Effusion 

c. Attraction with air 

d. Low dsensity 

Answer- Diffusion

Que-  The kinetic molecular theory of gases was put forward in 1738 by 

a. Boltzman 

b. Maxell 

c. Clausius 

d. Bernoulli 

Answer- Bernoulli

Que-  The highest temperature at which a substance can exist as a liquid is called its 

a. Critical temperature 

b. Standard temperature 

c. Absolute temperature 

d. Upper consulate temperature 

Answer- Critical temperature

Que-  Hydrogen effuses four times more rapidly than volume of an unknown gas molar mass of unknown gas should be 

a. 16 gmol-1 

b. 32 gmol-1 

c. 48 gmol-1 

d. 64 gmol-1 

Answer- 32 gmol-1

Que-  What will be the pressure of 1 mole of an ideal gas maintained at 300 K and 250cm3 volume? 

a. 5 atm 

b. 7 atm 

c. 8 atm 

d. 1 atm 

Answer- 5 atm

Que-  The processes of effusion and diffusion are best understand by 

a. Daltons law 

b. Avogadros law 

c. Grahams law 

d. Charles law 

Answer- Grahams law

Que-  Who made volume and pressure correction to explain deviation of gases from ideal behaviour? 

a. Clausius 

b. Boltzman 

c. Charles 

d. Vander waal 

Answer- Vander waal

Que-  The non-ideal behaviour results chiefly from 

a. Intermolecular attraction and infinite volume 

b. Elastic collisions and finite volume 

c. Intermolecular attractions and finite volume 

d. Intermolecular attraction only 

Answer- Intermolecular attractions and finite volume

Que-  The gases become non-ideal at 

a. High temperature and high pressure 

b. Low temperature and low pressure 

c. High temperature and low pressure 

d. Low temperature and high pressure 

Answer- Low temperature and high pressure

Que-  Linds method is employed for 

a. Separation of gases 

b. Expansion of gases 

c. Compression of gases 

d. Liquefaction of gases 

Answer- Liquefaction of gases

Que-  The relative attraction of the nucleus for the electrons in a chemical bond is called 

a. Ionization energy 

b. Electron affinity 

c. Electro negativity 

d. None of the above 

Answer- Electro negativity

Que-  The ionization energy 

a. Generally increases from left to right in a period 

b. Does not change in a period 

c. Increase from top to bottom in a group 

d. Does not change in a group 

Answer- Generally increases from left to right in a period

Que-  Which of the following will have highest value of electron affinity 

a. F 

b. Cl 

c. Br 

d. I 

Answer- Cl

Que-  The octet rule does not always hold for which of the following elements 

a. "C" 

b. "O" 

c. "F" 

d. "P" 

Answer- "P"

Que-  Which of the solid does not contain covalent bond 

a. Copper 

b. Ice 

c. Diamond 

d. Graphite 

Answer- Copper

Que-  Which of the following is the best explanation that CO2 is non polar molecule 

a. Linear geometry 

b. Dipole moment is zero 

c. Sp hybridization 

d. None 

Answer- Dipole moment is zero

Que-  Shielding effect across the period 

a. Increases 

b. Decreases 

c. Constant 

d. None 

Answer- Constant

Que-  Which one is not the absolute term of the element? 

a. Ionization energy 

b. Electron affinity 

c. Electro negativity 

d. Atomic size 

Answer- Electro negativity

Que-  Which one has maximum number of unpaired electrons? 

a. 6X 

b. 7Y 

c. 9Z 

d. 13W 

Answer- 7Y

Que-  In O2 each oxygen atom is hybridized 

a. sp3 

b. sp2 

c. sp 

d. All 

Answer- sp2

Que-  Molecular orbitals are filled according to 

a. Auf bau principle 

b. Hunds rule 

c. Paulis Exclusion principle 

d. All these 

Answer- All these

Que-  Measurement of the degree of polarity is 

a. Electron affinity 

b. Ionic character 

c. Ionization energy 

d. Dipole moment 

Answer- Dipole moment

Que-  Which one shows high %age of the ionic character? 

a. H2O 

b. HF 

c. HCI 

d. HBr 

Answer- HF

Que-  A specie with maximum number of unpaired electrons. 

a. F 

b. H2O 

c. HF 

d. NH-2 

Answer- NH-2

Que-  Which of the following have their outer most shell complete in atomic form? 

a. Noble gases 

b. Alkali metals 

c. Coinage metals 

d. Gun metals 

Answer- Noble gases

Que-  Force responsible to hold atoms together in a compound is called 

a. Bond 

b. Attractive force 

c. Interaction 

d. All of above represent same entity 

Answer- Bond

Que-  Energy of atom in compound is 

a. Higher than individual 

b. Lesser than individual 

c. No change 

d. Impossible to predict 

Answer- Lesser than individual

Que-  In a period the atomic radii 

a. Increases 

b. Decreases 

c. Remain same 

d. First decreases then increases 

Answer- Decreases

Que-  An atom loses or gains electrons to 

a. Gain stability 

b. Form a bond 

c. Complete its outermost shell 

d. all are accurate justifications 

Answer- all are accurate justifications

Que-  In a group ionic radii 

a. Increases 

b. Decreases 

c. No change 

d. Variable trend 

Answer- Increases

Que-  Energy required to remove electron from an atom 

a. Ionization potential 

b. Electronegativity 

c. Electron affinity 

d. Activation energy 

Answer- Ionization potential

Que-  Ionization energy in a period generally 

a. Increases 

b. Decreases 

c. No change 

d. Variable trend 

Answer- Increases

Que-  Greater shielding effect corresponds to ionization energy value 

a. Greater 

b. Lesser 

c. Remain same 

d. No effect 

Answer- Lesser

Que-  Elements having high I.P values are 

a. Metals 

b. Non metals 

c. Liquids 

d. Solids 

Answer- Non metals

Que-  Energy released or absorbed when electrons are added in atom is 

a. Ionization potential 

b. Electronegativity 

c. Electron affinity 

d. Activation energy 

Answer- Electron affinity

Que-  In a period electronegativity from left to right 

a. Increases 

b. Decreases 

c. Remain constant 

d. Variable trend 

Answer- Increases

Que-  Ionic bond is produced after complete transfer of 

a. Nucleus 

b. Neutrons 

c. Electrons 

d. Protons 

Answer- Electrons

Que-  Elements of group IA IIA are 

a. Electronegative 

b. Electropositive 

c. Neutral 

d. IA is electropositive while IIA is electronegative 

Answer- Electropositive

Que-  Bond will beionic when E.N difference of bonded atom is 

a. Equal to 1.7 

b. Greater than 1.7 

c. Less than 1.7 

d. No specificity exists 

Answer- Greater than 1.7

Que-  Mostly ionic compound are produced in between elements of 

a. IA and VIA 

b. IA IIA and VIIA 

c. IB and VIIB 

d. IA and IB 

Answer- IA IIA and VIIA

Que-  Which one of the following has polar covalent bond? 

a. HF 

b. CH4 

c. H2 

d. N2 

Answer- HF

Que-  The Lewis acids are 

a. Electron deficient 

b. Electron rich 

c. Octet is complete 

d. No such acids exist 

Answer- Electron deficient

Que-  Sharing of 1 electron pair by one specie forms 

a. Single covalent bond 

b. Hydrogen bond 

c. Double covalent bond 

d. Coordinate covalent bond 

Answer- Coordinate covalent bond

Previous Post Next Post