FBQ1: __________ is worn in the laboratory to avoid chemicals splashing into the eyes. Answer: Safety googles FBQ2: ____________ glassware is used to heat and evaporate liquids. Answer: Evaporating dish FBQ3: ____________ is the most precise and accurate method of transferring and delivering liquids. Answer: Volumetric glassware FBQ4: Any chemical spilled onto the skin should be washed off immediately with ________. Answer: Soap and water FBQ5: Flammable solvents should be boiled away in a _________. Answer: Fume hood FBQ6: The method of separating liquids from solids that involves allowing the solid to settle in a beaker, then transferring the liquid, or supernatant with the aid of a stirring rod to a receiver is called ___________. Answer: Decanting FBQ7: To prevent bumping of a hot liquid out of the container, ______ is added. Answer: boiling chip FBQ8: Reaction requiring low temperature of 00C can be carried out in the laboratory by employing ________. Answer: Ice–water bath FBQ9: In distillation the resultant hot vapour passes into a ___________ and is converted to the liquid. Answer: Condenser FBQ10: Vaporisation-condensation cycles is known as _____________. Answer: Theoretical plates FBQ11: The apparatus below is called __________.  Answer: Flat bottom flask FBQ12: Compounds which are ____________ crystallise first in recrystallization/crystallization technique Answer: Less soluble FBQ13: A suitable recrystallization solvent should be partially __________ in order to be easily removed from the purified crystals. Answer: Volatile FBQ14: ___________ is the recovery of a substance from a mixture by bringing it into contact with a solvent which dissolves the desired material. Answer: Extraction FBQ15: Distillation technique is applicable or suitable for substances that are ___________ in nature. Answer: Liquid FBQ16: __________ is a technique based on the principle of the equilibrium distribution of a substance (solute) between two immiscible phases, one of which is usually a solvent. Answer: Extraction FBQ17: Extraction is carried out by shaking the solution in a ____________-. Answer: Separatory funnel FBQ18: Solvents used to extract organic compounds from aqueous mixture or solution must be _______________ in water Answer: Virtually insoluble FBQ19: Boiling point is a __________ property often used to identify substances or to check the purity of the compound Answer: Physical FBQ20: The apparatus here presented is called _________. Answer: Buchner funnel FBQ21: The __________ cools vapour causing it to reliquify and direct the condensate to the receiving flasks. Answer: Lie–big condenser FBQ22: ________ are used to crush solids into powders for experiments. Answer: Mortar and pestle FBQ23: __________ are used to hold many different things such as flasks, crucibles and evaporating dishes when they are hot. Answer: Tong FBQ24: Burettes are used to deliver accurate ____________ . Answer: Volumes FBQ25: This apparatus is used for ____________. Answer: Measuring liquids by volume FBQ26: The instrumental set up above is used for __________. Answer: Filtration FBQ27: The difference between a simple distillation apparatus and a fractional distillation apparatus is that, between the distillation flask and the distillation head is inserted ________ column. Answer: Fractionating column FBQ28: A _______ is defined as the temperature range over which a small amount of solid in a thin walled capillary tube first visibly softens and then completely liquefies. Answer: Capillary melting point FBQ29: This apparatus is used for _____________. Answer: Measuring liquids by volume FBQ30: The presence of a __________ in a crystal lattice interrupts its uniform structure and the forces of attraction are weakened. Answer: Foreign particle FBQ31: To avoid the errors in mass due to the use of balances that are not calibrated, one should weigh by a method called ____________. Answer: Weighing by difference FBQ32: The function of stirring when carrying out a chemical reaction in the laboratory is to ________ the reagents or to aid heat transfer. Answer: Mix FBQ33: The process of boiling reactants while continually cooling the vapour returning it back to the flask as a liquid is known as ___________. Answer: Reflux FBQ34: _________ is often used to heat solutions that boil below about 900C or to heat a mixture to approximately 1000C. Answer: Steam bath FBQ35: The most basic technique for the purification of organic solids is ______________. Answer: Recrystallization MCQ1: In preparing a standard solution, two factors must be considered, namely: Answer: 1.The solute must be pure 2. The suitable solvent should be measure to a definite volume MCQ2: A solution contains 1.2 Molar concentration, what volume of it must be diluted with water to give 600 mls of 0.5 Molar solution? Answer: 25 mls MCQ3: In a chemistry laboratory a stoke bottle of acid solution reads, “1.25 specific gravity”; what does that mean? Answer: 1 cm3 of that solution weight 1.25 g MCQ4: If 2 cm3 of a stoke solution contains 1 mole of an acid how would you prepare 1 molar concentration of that acid in 250 cm3 of water? Answer: Dissolve 2 cm3 of the stoke solution in 248 cm3 of water MCQ5: A substance which loses water of hydration upon exposure to atmosphere is called? Answer: Efflorescence substance MCQ6: A substance which takes in only moisture upon exposure to atmosphere is referred to as? Answer: Deliquescent substance MCQ7: A table of requirement for laboratory experiment contains the following except? Answer: List of weight of each reagents MCQ8: Give reason why water should not be added to acid during carrying out acid-base titration? Answer: The dissolution of acid in water is exothermic which may cause explosion MCQ9: The concentration of pure HCl 11.7 Molar if 20 cm3 of the acid is diluted to 250 cm3 to give concentration of 0.936 mol.dm3 substitute this values on this equation; CIVI=C2V2? Answer: 11.7 X 20 = 0.936 X 250 MCQ10: The point at which stoicheometrically equivalent quantities of substance have been brought together is known as? Answer: Equivalence point of titration MCQ11: Which of the following options is an indicator used for acid-base titration? Answer: Methyl orange MCQ12: In an acid base titration conducted by a student, the colour of the solution in the beaker changed from colourless to pink when phenolphthalein was used as an indicator, what went wrong? Answer: The beaker was occupied by acid solution instead of base. MCQ13: What is a PH of a solution? Answer: It is the measure of hydrogen ions concentration in the solution MCQ14: At neutralization point, the PH value is? Answer: Seven MCQ15: At complete neutralization point, the litmus paper colour turns? Answer: Purple MCQ16: Predict the colour of methyl orange when pH is 8? Answer: Yellow MCQ17: What is the colour of bromothymol when added to an acid solution? Answer: Yellow MCQ18: An indicator X was added to an acid solution in a beaker but no colour change was observed give the name of the indicator X? Answer: Phenolphthalein MCQ19: What is a strong acid? Answer: Any acid that ionizes completely in solution MCQ20: An example of a strong acid is? Answer: H2SO4 MCQ21: What type of indicator will be suitable for use in a titration involving H2SO4 + NH3(ag)? Answer: Methyl orange MCQ22: Which of these indicators will be suitable for use in a titration involving a weak acid and a strong base? Answer: Phenolphthalein MCQ23: What is the implication of adding a phenolphthalein as an indicator during the titration of HCl against Na2CO3? Answer: The end point will appear when only half of Na2CO3 has been used MCQ24: What is the importance of back titration? Answer: To determine the concentration of a substance that is in excess after a chemical reaction. MCQ25: A 25 ml solution of 0.5 M NaOH is titrated until neutralized into a 50 ml sample of HCl? Answer: 0.25 mol MCQ26: A student used a hard tap water and performed and acid base titration. In few lines explain what would happen to his result? Answer: the starting solution would be more alkaline therefore it would require more volume of acid than expected MCQ27: Choose the most suitable water for use in acid base titration? Answer: Deionised water MCQ28: Both molarity and normality are measures of concentration. True or false? Answer: True MCQ29: During acid-base titration sulphuric acid would be dissociated into what ions? Answer: 2H+ + SO4- MCQ30: What is a titrand in titration analysis? Answer: Unknown concentration of an analyte MCQ31: What is a titrant in titration analysis? Answer: Known concentration and volume of an analyte MCQ32: Which of these is a method of finding the equivalence point? Answer: All of the options MCQ33: When performing acid-base titration, one should first? Answer: Rinse the burette twice with acid solution MCQ34: The equation NaOH + HCl →NaCl + H2O is a ____? Answer: Neutralization reaction MCQ35: The following are advantages of acid base titration except? Answer: Less accuracy and precision MCQ1: Amongst the glassware listed below ___________ is the most precise and accurate method of transferring and delivering liquids. Answer: Graduated cylinders MCQ2: _____________ is not a separation technique frequently employed in the laboratory to isolate one or more components from a mixture? Answer: Crystallography MCQ3: Which of these statements is true? Answer: Simple distillation involves one cycle of vaporisation - condensation MCQ4: A graduated cylinder is filled to the 40.00 ml mark with mineral oil. The masses of the cylinder before and after the addition of mineral oil are 124.966 g and 159.446 g. Determine the density of the mineral oil. Answer: 0.8620 g/ml MCQ5: A suitable recrystallization solvent is one that __________. Answer: Does not react with the compound being purified MCQ6: An extraction solvent is usually a ______________. Answer: Volatile organic liquid MCQ7: ­­­­­­­­­______ amongst the options is not used in gravity filtration? Answer: Test tube MCQ8: Reagents can be agitated/ mixed during a chemical reaction by the use of __________. Answer: Magnetic stirrer MCQ9: The function of placing wire gauze between a vessel containing a substance to be heated and a burner is ___________. Answer: To provide support and disperse heat MCQ10: When acid is spilled in the laboratory it should be ____________. Answer: Neutralised with sodium bicarbonate MCQ11: __________ does not yield a pure product. Answer: Extraction MCQ12: _________ bonds are broken during a change from the liquid phase to the gas phase. Answer: Dipole - dipole interactions MCQ13: One of the disadvantages of wearing loose sleeves to the laboratory during a practical class is _____________. Answer: They can sweep flasks from the laboratory bench MCQ14: _________ provides a large surface area in which the initial distillate is redistilled and condensed again. Answer: Fractionating column MCQ15: Amongst the various means/method of heating _________ is used to heat a mixture for extended periods and at certain temperatures. Answer: Refluxing MCQ16: Separatory funnel is used to separate ___________ Answer: Two immiscible liquids MCQ17: __________ will not provide heat of over 1000C ? Answer: Heating mantle MCQ18: ________ is ideal for measuring liquids by volume. Answer: Graduated cylinder MCQ19: _________ is not a volumetric glassware. Answer: Round bottom flask MCQ20: Darkened brown or amber glass is used to ______________. Answer: Keep out much of UV and IR radiation MCQ21: Reactions requiring low temperatures can be achieved using all of the options provided to maintain low temperature except ___________. Answer: Liquid helium MCQ22: Glassware are used for experiments in the Chemistry laboratory because __________. Answer: They are relatively inert, transparent and more heat-resistant MCQ23: Which of these is/are more accurate and precise in taking weight measurements? Answer: Digital balance MCQ24: The principle of separation of insoluble solid from a liquid by filtration is based on ___________ Answer: Gravity MCQ25: All of the following can be used to separate liquids from solids except ___________. Answer: Distillation MCQ26: Extraction is used for the separation of materials that are ___________ in nature. Answer: Liquid and solid MCQ27: Using an unclean volumetric glassware during experiment will ___________. Answer: Reduce precision MCQ28: What does the symbol below represent in the Chemistry laboratory. Answer: Toxic MCQ29: Which of the following is not employed in heating ? Answer: Drying agent MCQ30: Extraction is carried out by shaking the solution with a second solvent that is ___________ with the one in which the compound is dissolved. Answer: Immiscible MCQ31: Amongst the options listed below _________ is a better choice for the heating of flammable substances. Answer: Steambath MCQ32: Substances that absorb water if left exposed to the air are kept dry in the laboratory by placing them in ___________. Answer: A dessicator MCQ33: ___________ is used to hold solids when being weighed. Answer: Watch glass MCQ34: A chemist would determine several physical and chemical properties of a compound because _________. Answer: It is possible for two different compounds to have a few identical physical and chemical properties. MCQ35: _______ is the most common extraction solvent. Answer: Ethyl ether