Chemistry MCQ (Multiple Choice Questions) - SchoolingAxis

Chemistry MCQ (Multiple Choice Questions)

 Que-  The geometry of ammonia is 

a. Tetrahedral 

b. Square planner 

c. Trigonal bipyramidal 

d. Trigonal Pyramidal 

Answer- Trigonal Pyramidal

Que-  Orbitals of same energy produced after mixing of orbitals of different energy are called 

a. Degenerate orbitals 

b. Generate orbitals 

c. Hybrid orbitals 

d. Zeeman orbitals 

Answer- Degenerate orbitals

Que-  By combining n atmic orbitals no. of hybrid orbitals will be 

a. 2n 

b. n 

c. 3n 

d. impossible to predict 

Answer- n

Que-  on sp3 hybridization 

a. All p-orbitals are involved 

b. One s and 3 p-orbitals are involved 

c. one p-orbital is involved 

d. four p-orbitals are involved 

Answer- One s and 3 p-orbitals are involved

Que-  Geometry of simple molecule having sp3 hybrid orbital is 

a. Triangular 

b. Tetrahedral 

c. Square planner 

d. Linear 

Answer- Tetrahedral

Que-  Geometry of molecule will be pyramidal if the outer post shell of the central atom has 

a. 3 bond pair one lone pair 

b. 2 bond pair 2 lone pair 

c. 1 bond pair 3 lone pair 

d. 3 lone pair 1 bond pair 

Answer- 3 bond pair one lone pair

Que-  Pi bonds are produced by overlapping of 

a. Un-hybrid orbitals 

b. Hybrid orbitals 

c. Hybrid and un hybrid orbitals 

d. atomic orbital and hybrid orbital 

Answer- Un-hybrid orbitals

Que-  According to VESPR Model the geometry of molecule having 5 bond pair in outer most shell will be 

a. Triangular 

b. Square planner 

c. Trigonal bipyramidal 

d. Octahedral 

Answer- Trigonal bipyramidal

Que-  Molecular orbital which have higher energy than atomic orbitals is called 

a. Bonding molecular orbital 

b. Antibonding molecular orbital 

c. Hybrid orbital 

d. Super atomic orbital 

Answer- Antibonding molecular orbital

Que-  Unpaired electron in a molecule gives _________ character. 

a. Ferromagnetic 

b. Paramagnetic 

c. Diamagnetism 

d. Both a & b 

Answer- Paramagnetic

Que-  Bond order for N2 molecule is 

a. 2 

b. 1 

c. 3 

d. 4 

Answer- 3

Que-  Product of charge and distance is called 

a. Pressure 

b. Bond length 

c. Work 

d. Dipole moment 

Answer- Dipole moment

Que-  Unit of dipole moment is 

a. Debye 

b. Poise 

c. Pascal 

d. Newton 

Answer- Debye

Que-  The pH of 10-3 mol dm-3 of an aqueous solution of H2SO4 is 

a. 3 

b. 7 

c. 2 

d. 5 

Answer- 7

Que-  Kc value has 

a. No units 

b. Units 

c. Both a & b 

d. None 

Answer- Both a & b

Que-  If a buffer solution of higher pH than seven is to be made we use 

a. Strong acid and strong base 

b. Weak acid and strong base 

c. Weak acid and strong base 

d. Weak acid and its salt with strong base 

Answer- Weak acid and its salt with strong base

Que-  Sodium benzoate and benzoic acid are mixed in equimolar ration to form buffer if pKa is 2 what will be the pH? 

a. 0 

b. 1 

c. 2 

d. any one 

Answer- 2

Que-  AgCl dissolved with conc (2x10-2) Ksp will be 

a. 6 x 10-6 

b. 6 x 10-5 

c. 2 x 10-6 

d. 4 x 10-4 

Answer- 4 x 10-4

Que-  In which of the following equilibria will Kc and Kp have the same value? 

a. PCI5 = PCI3 + Cl2 

b. N2 + 3H2 = 2NH 

c. 2CO + O2 = CO2 

d. N2 + O2 = 2NO 

Answer- N2 + O2 = 2NO

Que-  Which of the following will not change the concentration of ammonia at the equilibrium ? 

a. Increase of pressure 

b. Increase of volume 

c. Addition of catalyst 

d. Decrease of temperature 

Answer- Addition of catalyst

Que-  For a reaction involving only gases at 25Degree Centigrade the equilibrium constant can be expressed in terms of molarity Ke or partial pressure Kp. Which is true about the numerical value of Kp? 

a. Kc is generally greaer than Kp 

b. Kc is generally less than Kp 

c. Kc is generally equal to Kp 

d. Kc is equal to Kp if the total moles of reactants and products are equal 

Answer- Kc is equal to Kp if the total moles of reactants and products are equal

Que-  Which of following is not a base 

a. KOH 

b. NH3 

c. PH3 

d. BF3 

Answer- BF3

Que-  Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution? 

a. 0002M HCI 

b. 2 mole of NaCI with 0.2 mole of HNO3 

c. 4 mole of CH3COOH with 0.4 mole of NaOH 

d. 4 mole of NH3 with 0.2 mole of HCI 

Answer- 4 mole of NH3 with 0.2 mole of HCI

Que-  Which one of the following aqueous solutions will be basic? 

a. NaCI 

b. Na2SO4 

c. Na2CO3 

d. FeCl3 

Answer- Na2CO3

Que-   Reaction which proceeds in both directions is called 

a. reversible 

b. irreversible 

c. spontaneous 

d. non-spontaneous 

Answer- reversible

Que-  Chemical equilibrium state is 

a. dynamic state 

b. static state 

c. free state 

d. unidirectional state 

Answer- dynamic state

Que-  Conversion of reactant into product in unit time is called 

a. rate of forward reaction 

b. rate of backward reaction 

c. rate constant 

d. rate co-efficient 

Answer- rate of forward reaction

Que-  At start of reaction the concentration of reactants is 

a. high 

b. low 

c. according to Kc 

d. constant 

Answer- high

Que-  Unit of Kc is 

a. moles2dm+6 

b. moles-2dm+6 

c. moles+2dm-6 

d. Kc may or may not have units 

Answer- Kc may or may not have units

Que-  In case of gases Kc is replaced by 

a. Ka 

b. Kb 

c. Kp 

d. K 

Answer- Kp

Que-  Rate expression for ammonia synthesis is 

a. Kc=x2/(a-x)(b-x) 

b. Kc=x2/v(a-x) 

c. Kc=4x2/(a-2x)2(b-x) 

d. Kc=4x2v2/(a-x)(b-3x)3 

Answer- Kc=4x2v2/(a-x)(b-3x)3

Que-  When the value of Kc is very small then 

a. reaction is at start 

b. product conc. Is maximum 

c. reactant conc. Is minimum 

d. reaction is completed 

Answer- product conc. Is maximum

Que-  Catalyst used to speed up the reaction of ammonia synthesis is 

a. V2O5 

b. V2O5 and Pt 

c. Fe 

d. Pieces of Fe crystals are embedded in fused mixture of MgO Al2O3 and SiO2 

Answer- Pieces of Fe crystals are embedded in fused mixture of MgO Al2O3 and SiO2

Que-  Temperature for preparation of SO3 is 

a. 400-500Degree Centigrade 

b. 400Degree Centigrade 

c. 600Degree Centigrade 

d. 200Degree Centigrade 

Answer- 400-500Degree Centigrade

Que-  By the addition of base in waterpH will be 

a. more than 7 

b. less than 7 

c. equal to 7 

d. no effect 

Answer- more than 7

Que-  Idea of pH and pOH  was put forward by 

a. Gibbs 

b. Einstein 

c. Sorenson 

d. Chadwick 

Answer- Sorenson

Que-  Negative log of mular concentration of H+ ions is called 

a. pH 

b. pOH 

c. pKa 

d. pKw 

Answer- pH

Que-  Ka<10-3 means 

a. Very strong base 

b. Very weak acid 

c. Very strong acid 

d. Very strong salt 

Answer- Very weak acid

Que-  Any substance which accepts H+ is base favours the concept 

a. Lowrys 

b. Lewis 

c. Arrhenius 

d. None of these 

Answer- Lowrys

Que-  Conjugated base of a weak acid is 

a. weak 

b. strong 

c. moderately weak 

d. unstable 

Answer- strong

Que-  When sparingly soluble salt is in equilibrium with molar concentration of its oppositely charged ion when the product is called 

a. common ion effect 

b. solubility product 

c. dissociation constant 

d. dissociation constant for an acid 

Answer- solubility product

Que-  Solution having the property of a very little change in pH on adding a small amount of strong acid or base is called 

a. buffer solution 

b. normal solution 

c. standard solution 

d. neutral solution 

Answer- buffer solution

Que-  Addition of CH3COOH and CH3COONa gives in water 

a. Standard solution 

b. buffer solution 

c. acidic buffer solution 

d. both b & c 

Answer- both b & c

Que-  Which one of the following is a buffer solution? 

a. brine 

b. blood 

c. glue 

d. solution of CuSO4 

Answer- blood

Que-  Solubility of any salt can be determined from 

a. Ka 

b. Kb 

c. Kc 

d. Ksp 

Answer- Ksp

Que-  The pH of human blood is 

a. 7 

b. 35 

c. 5 

d. 8 

Answer- 35

Que-  By decreasing the pressure the reaction will go to that direction where 

a. volume is decreased 

b. volume increased 

c. heat absorbed 

d. no. of moles of specie decreased 

Answer- volume increased

Que-  Equilibrium state is achieved quickly by the addition of. 

a. reactants 

b. acid 

c. base 

d. catalyst 

Answer- catalyst

Que-  Which one is not state function 

a. Internal energy 

b. Enthalpy 

c. Gibbs free energy 

d. Work 

Answer- Work

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-  ________________ is study about energy of a chemical system 

a. thermochemistry 

b. thermodynamics 

c. chemical kinetics 

d. stoichiometry 

Answer- thermochemistry

Que-  The environment in which a system is studied is 

a. State function 

b. phase 

c. surrounding 

d. state 

Answer- surrounding

Que-  Unit of heat in SI system is 

a. J 

b. KCaL 

c. Cal 

d. GJ 

Answer- J

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-  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-  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-  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-  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-  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-  When enthalpy of reactants is higher than product then reaction will be 

a. endothermic 

b. spontaneous 

c. non-spontaneous 

d. exothermic 

Answer- exothermic

Que-  Enthalpy of a reaction can be measured by 

a. glass calorimeter 

b. manometer 

c. Barometer 

d. thermometer 

Answer- glass calorimeter

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-  Which of the following solutions of H2SO4 is more concentrated? 

a. 1 Molar solution 

b. 1 molal solution 

c. 1 normal solution 

d. all have same concentration 

Answer- 1 Molar solution

Que-  Which of the following unit of concertration is independent of temperature? 

a. Molarity 

b. Molality 

c. Mole fraction 

d. all 

Answer- Molality

Que-  Which of the following is an example of liquid in gas solution. 

a. Opals 

b. Dust particles in smoke 

c. Paints 

d. Fog 

Answer- Fog

Que-  The molal boiling point constant is the ration of the elevation of boiling point to 

a. Molarity 

b. Molality 

c. More fraction of solvent 

d. Mole fraction of solute 

Answer- Molality

Que-  Which of the following are the conditions of colligative properties 

a. Non-electrolye solute 

b. Non-volatile solute 

c. Dilute solution 

d. All of the above 

Answer- All of the above

Que-  Which has the minimum freezing point? 

a. One Molal NaCI 

b. One molal KCI solution 

c. One molal CaCI2 

d. One molal urea solution 

Answer- One molal CaCI2

Que-  Which of the following is not a colligative property? 

a. Lowering of vapour pressure 

b. Freezing point 

c. Osmotic pressure 

d. Elevation of polling point 

Answer- Freezing point

Que-  Which of the following substance do not show continuous solubility curve? 

a. KCIO4 

b. Na2SO4. 10H2O 

c. K2Cr2O7 

d. PbCl2 

Answer- Na2SO4. 10H2O

Que-  When common salt is dissolved in water? 

a. Boiling point of water dicrease 

b. Boiling point of water increase 

c. Boiling point of water remains same 

d. None of the above 

Answer- Boiling point of water increase

Que-  Every sample of matter with uniform properties and fixed composition is called 

a. solute 

b. solvent 

c. solution 

d. phase 

Answer- phase

Que-  Homogeneous mixture of two or more than two compounds is called 

a. solution 

b. compound 

c. radical 

d. ion 

Answer- solution

Que-  The component of solution which is in smaller amount is called 

a. solvent 

b. solute 

c. phase 

d. ion 

Answer- solute

Que-  Solution with maximum concentration of solute at given temperature is called 

a. Super saturated solution 

b. unsaturated solution 

c. saturated solution 

d. dilute solution 

Answer- saturated solution

Que-  10ml of alcohol dissolve in 90ml of water unit of concentration used is 

a. % w/w 

b. % w/v 

c. % v/v 

d. % v/w 

Answer- % v/v

Que-  Number of moles in 1 kg of solvent is called 

a. normality 

b. molarity 

c. molality 

d. mole fraction 

Answer- molality

Que- 5g of of NaCl per 1 dm3 of solution of NaCl in water the concentration of solution will be 

a. 1 M 

b. 1 m 

c. 1 M 

d. 1 N 

Answer- 1 M

Que-  In partially miscible liquids the two layers are 

a. saturated solutions of each liquid 

b. unsaturated solutions of each liquid 

c. normal solution of each liquid 

d. no layer formation takes place 

Answer- saturated solutions of each liquid

Que-  If the volume of solution is equal to sum of volumes of its all components then the solution 

a. will be an ideal solution 

b. will be non-ideal solution 

c. will show deviations from Raoults law 

d. both b & c 

Answer- will be an ideal solution

Que-  The relative lowering of vapour pressure is 

a. equal to the mole fraction of solvent 

b. equal to the mole fraction of solute 

c. directly proportional to the mole fraction of solute 

d. both b & c 

Answer- both b & c

Que-  The solution which distils over with change in composition 

a. ideal solution 

b. zeotropic solution 

c. azeotropic solution 

d. non-ideal solution 

Answer- zeotropic solution

Que-  Mixtures which distill over without change in composition called 

a. zeotropic mixture 

b. azeotropic mixture 

c. amphoteric mixture 

d. ideal solution 

Answer- azeotropic mixture

Que-  Concentration of solute molecule when they are in equilibrium with solid substance at particular temperature is called 

a. saturated solution 

b. solubility 

c. unsaturated solution 

d. super saturated solution 

Answer- solubility

Que-  Solubility of KCIO3 gives 

a. continuous and falling solubility curve 

b. discontinuous and falling solubility curve 

c. continuous and rising solubility curve 

d. discontinuous and rising solubility curve 

Answer- continuous and rising solubility curve

Que-  The determination of correct molecular weight from Raoults law is applicable to 

a. a volatile solute in dilute solution 

b. a non-electrolyte & non volatile solute in concentrated solution 

c. a non-electrolyte & non volatile solute in concentrated solute 

d. non volatile solute in a dilute solution 

Answer- non volatile solute in a dilute solution

Que-  Boiling point elevations can be measured by 

a. Beckmanns method 

b. Landsbergers method 

c. Linds method 

d. none of the above 

Answer- Landsbergers method

Que-  Beckmanns apparatus is used to measure 

a. boiling point elevation 

b. depression in freezing point 

c. lowering of vapour pressure 

d. lowering of osmotic pressure 

Answer- depression in freezing point

Que-  The compounds in which water molecules are added are called 

a. Hydrated ions 

b. double salts 

c. hydrates 

d. complexes 

Answer- hydrates

Que-  Hydration is a process in which 

a. Molecules are surrounded by solvent molecules 

b. Ions are surrounded by solvent molecules 

c. Both ions and molecules are surrounded by solvent molecules 

d. Both ions and molecules are surrounded by water molecules 

Answer- Both ions and molecules are surrounded by water molecules

Que-  Solution of Na2SO4 will be 

a. basic 

b. acidic 

c. neutral 

d. cannot be presicted without data 

Answer- neutral

Que-  ppm means 

a. parts of solute in 1000 parts of solvent 

b. parts of solvent in 1000 parts of solute 

c. parts of solute in one million parts of solution 

d. parts of solvent in one million parts of solute 

Answer- parts of solute in one million parts of solution

Que-  1 molar solution of glucose in water contains weight of glucose 

a. 180g/dm3 

b. 170g/dm3 

c. 190g/dm3 

d. 195g/dm3 

Answer- 180g/dm3

Que-  Water of crystallization can be removed by 

a. drying 

b. heating 

c. evaporation 

d. All of the above 

Answer- heating

Que-  The relative lowering of vapour pressure is directly proportional to molality if the solution is 

a. concentrated 

b. dilute 

c. saturated solution 

d. all of the above 

Answer- dilute

Que-  Which one of the following salt does not hydrolyzed 

a. Na2SO4 

b. AlCl3 

c. CuSO4 

d. NH4Cl 

Answer- Na2SO4

Que-  Which of the following element act as inert electrode 

a. Cu 

b. Ag 

c. Pt 

d. None 

Answer- Pt

Previous Post Next Post