Chemistry MCQ (Multiple Choice Questions) - SchoolingAxis

Chemistry MCQ (Multiple Choice Questions)

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

a. Boltzman  

b. Maxell  

c. Clausius  

d. Bernoulli 

Answer- Bernoulli

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

a. H2S  

b. NO  

c. Cl2  

d. N2O 

Answer- NO

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- 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- 0.5 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- 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- In how many forms do matter exists ? 

a. Three  

b. Four  

c. Five  

d. Two 

Answer- Four

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

a. Gas  

b. Liquid  

c. Solid  

d. Plasma 

Answer- Solid

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- Which one is the right value for R ? 

a. 0.0821 atm dm3k-1mol-  

b. 0.0821 atm m3k-1mol-1  

c. 2 cal k-1 mol-1  

d. 8.314 Nm2k-1mol-1 

Answer- 0.0821 atm dm3k-1mol-

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

a. 98.5 atm  

b. 96.7 atm  

c. 95.8 atm  

d. 97.1 atm 

Answer- 98.5 atm

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 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- The pH of 10-3 mol dm-3 of an aqueous solution of H2SO4 is_________________? 

a. 3  

b. 2.7  

c. 2  

d. 1.5 

Answer- 2.7

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- AgCl dissolved with conc (2×10-2) Ksp will be__________________? 

a. 3.6 x 10-6  

b. 3.6 x 10-5  

c. 7.2 x 10-6  

d. 4 x 10-4 

Answer- 4 x 10-4

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 25?C 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 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- 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- 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- Rate expression for ammonia synthesis is___________________? 

a. Kc=x2/(a-x)(b-x)  

b. Kc=x2/v(a-x)  

c. Kc=4×2/(a-2x)2(b-x)  

d. Kc=4x2v2/(a-x)(b-3x)3 

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

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- 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- Negative log of mular concentration of H+ ions is called___________________? 

a. pH  

b. pOH  

c. pKa  

d. pKw 

Answer- pH

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

a. Lowrys  

b. Lewis  

c. Arrhenius  

d. None of these 

Answer- Lowrys

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- 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- Solubility of any salt can be determined from_______________? 

a. Ka  

b. Kb  

c. Kc  

d. Ksp 

Answer- Ksp

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 of the following is a buffer solution ? 

a. brine  

b. blood  

c. glue  

d. solution of CuSO4 

Answer- blood

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- Conjugated base of a weak acid is_________________? 

a. weak  

b. strong  

c. moderately weak  

d. unstable 

Answer- strong

Que- Kc value has_______________? 

a. No units  

b. Units  

c. Both A & B  

d. None 

Answer- Both A & B

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- 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 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. 0.0002M HCI  

b. 0.2 mole of NaCI with 0.2 mole of HNO3  

c. 0.4 mole of CH3COOH with 0.4 mole of NaOH  

d. 0.4 mole of NH3 with 0.2 mole of HCI 

Answer- 0.4 mole of NH3 with 0.2 mole of HCI

Que- Chemical equilibrium state is_______________? 

a. dynamic state  

b. static state  

c. free state  

d. unidirectional state 

Answer- dynamic state

Que- At start of reaction the concentration of reactants is_______________? 

a. high  

b. low  

c. according to Kc  

d. constant 

Answer- high

Que- In case of gases Kc is replaced by_______________? 

a. Ka  

b. Kb  

c. Kp  

d. K 

Answer- Kp

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- Idea of pH and pOH was put forward by________________? 

a. Gibbs  

b. Einstein  

c. Sorenson  

d. Chadwick 

Answer- Sorenson

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- Which of the following is a macro nutrient ? 

a. boron  

b. iron  

c. copper  

d. carbon 

Answer- carbon

Que- Three elements needed for the healthy growth of plants are_________________? 

a. N P K  

b. N K C  

c. N S P  

d. N Ca P 

Answer- N P K

Que- Residence time of methane in the atmosphere is___________________? 

a. 3 – 7 days  

b. 2 -3 days  

c. 3 – 7 years  

d. 2 – 3 years 

Answer- 3 – 7 years

Que- Hypochlorous acid is used for disinfecting the water it reacts with the dissolved ammonia producing___________________? 

a. NH2Cl  

b. NHCI2  

c. NCI2  

d. all of the above 

Answer- all of the above

Que- Acid present in acid rain may be__________________? 

a. H2SO4  

b. HNO3  

c. both A and B  

d. none 

Answer- both A and B

Que- Which of the following is not a condition for the formation of smog ? 

a. sufficient NO  

b. sunlight  

c. less movement of air  

d. winds 

Answer- winds

Que- In which of the following layer of atmosphere there is more thickness of ozone layer ? 

a. troposphere  

b. stratosphere  

c. mesosphere  

d. photosphere 

Answer- stratosphere

Que- Which of the following air pollutants is more dangerous for ozone layer ? 

a. CFC  

b. CO2  

c. CO  

d. Oxides of nitrogen 

Answer- CFC

Que- Which statement is wrong ? 

a. the amount of ozone layer is greater in the region close to the equator  

b. ozone acts as filter for UV radiations  

c. in the equatorial region it acts as pollutant  

d. CFCs play effective role in removing O3 in the stratosphere 

Answer- the amount of ozone layer is greater in the region close to the equator

Que- In the purification of portable water the coagulant used is_________________? 

a. alum  

b. nickel sulphate  

c. copper sulphate  

d. barium sulphate 

Answer- alum

Que- Newspaper can be recycled again and again how many times ? 

a. 2  

b. 3  

c. 4  

d. 5 

Answer- 5

Que- The main pollutant of leather tanneries in the waste water is____________________? 

a. chromium III  

b. chromium IV  

c. chromium V  

d. chromium VI 

Answer- chromium IV

Que- Which substance can be used for disinfecting water ? 

a. KMnO4  

b. Alums  

c. Ozone  

d. All 

Answer- KMnO4

Que- Which one of the following makes the bulk of hydrospheres content ? 

a. oceans  

b. glaciers & icecaps  

c. fresh water lakes and ponds  

d. All have equal distribution 

Answer- oceans

Que- The percentage of suspended solid waste in raw water is removed by coagulation is__________________? 

a. 60  

b. 70  

c. 80  

d. 90 

Answer- 80

Que- The main product of bacterial action is_________________? 

a. Nox  

b. NO2  

c. N2O3  

d. NO 

Answer- NO

Que- Pollutants have adverse effect over_________________? 

a. Biosphere  

b. Ecosystem  

c. Both a & b  

d. Hydrosphere 

Answer- Ecosystem

Que- Which of the following is not a heavy industry ? 

a. iron  

b. fertilizer  

c. paper  

d. none 

Answer- none

Que- Requirement of macronutrient per acre of the land is_________________? 

a. 5 to 200 kg  

b. 20-200 kg  

c. 200-400 kg  

d. 30-400 kg 

Answer- 5 to 200 kg

Que- Which of the following is not a secondary pollutant_________________? 

a. ozone  

b. carbonic acid  

c. sulphuric acid  

d. carbon dioxide 

Answer- carbon dioxide

Que- Major cause of SO2 on global scale is__________________? 

a. volcanoes  

b. electric sparks  

c. combustion  

d. all 

Answer- volcanoes

Que- The yellow colour in photochemical smog is due to presence of__________________? 

a. dinitrogen oxide  

b. nitrogen dioxide  

c. chlorine gas  

d. chlorine dioxide 

Answer- nitrogen dioxide

Que- Which of the following is not primary pollutant__________________? 

a. SO3  

b. CO  

c. NO  

d. H2SO4 

Answer- H2SO4

Que- Which of the following gases is the main cause of acid rain ? 

a. CO  

b. NO2  

c. both a & b  

d. none of the above 

Answer- NO2

Que- Which of the following factors help to measure quallity of water ? 

a. DO  

b. BOD  

c. COD  

d. all of the above 

Answer- all of the above

Que- A single chlorine free radical can destroy how many ozone molecules ? 

a. 10  

b. 100  

c. 10000  

d. 100000 

Answer- 100000

Que- Chlorination of water may be harmful if the water contains_________________? 

a. Ammonia  

b. Dissolved oxygen  

c. Carbon dixide  

d. All 

Answer- Ammonia

Que- Which of the following is used as water disinfectant to avoid the formation of toxic compounds_________________? 

a. Cl2  

b. O3  

c. ClO2  

d. both B & C 

Answer- both B & C

Que- Ozone hole is substantial depletion of ozone in every year during__________________? 

a. Aug – Nov  

b. Sep – Nov  

c. Nov – Dec  

d. Dec – Jan 

Answer- Sep – Nov

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 is an example of liquid in gas solution? 

a. Opals  

b. Dust particles in smoke  

c. Paints  

d. Fog 

Answer- Fog

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- When common salt is dissolved in water ? 

a. Boiling point of water decrease  

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- Homogeneous mixture of two or more than two compounds is called__________________? 

a. solution  

b. compound  

c. radical  

d. ion 

Answer- solution

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- Number of moles in 1 kg of solvent is called_________________? 

a. normality  

b. molarity  

c. molality  

d. mole fraction 

Answer- molality

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- 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- 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- 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- 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- The compounds in which water molecules are added are called_______________? 

a. Hydrated ions  

b. double salts  

c. hydrates  

d. complexes 

Answer- hydrates

Que- Solution of Na2SO4 will be_________________? 

a. basic  

b. acidic  

c. neutral  

d. cannot be presicted without data 

Answer- neutral

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- Which one of the following salt does not hydrolyzed________________? 

a. Na2SO4   

b. AlCl3  

c. CuSO4  

d. NH4Cl 

Answer- Na2SO4 

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