MCQ Volumeric Titration

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Question In Standard solution which of the following is accurately known A] Normality, strength or % of chemicals B] Volume C] Pressure D] Temperature The process of adding known concentration until it complete the reaction with known volume is called as A] Titrant B] Analysis C] Titration D] Titrend In titration end point can be determined by change in colour by A] Measuring Cylinder B] Burette C]Instrument D]Indicator The Quantity of chemical in each liter of solution is known as ….. A] Normality B] Strength C] Molecular weight D] Equivance weight Exactly required concentration can be prepared from chemical reagent is called as A]Primary standard B] Secondary standard C] Both A & B D] None of this Before performing the titration ,two pieces of apparatus should be washed with the solution they are to contain ,what are these two prices of apparatus A]Burette & Funnel B] Pipette & Conical Flask C] Burette & Pipette D] Conical Flask & funnel If 25 ml 0.1 M solution of HCl was diluted to of 500 ml , what is the new concentration of the HCl Solution A] 0.005 M B] 200 M C] 0.05 M D] 20 M A bottle labeled 20 % CuSO4 contain 200 ml of solution ,How many grams of CuSO4 are there present in this solution? A]4000 B] 20

Answer A

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2

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C]40 D]200 Normality = ………………….. A] gram-equivalent of the solute per litre of solution B] Mole per litre of solution C] Atom per litre of solution D] Molecules per litre of solution The no. of gram moles of solute per litre of solution is A]Normality B]Molarity C]Molality D]Mole fraction The no. of gram moles of solute per kilo grams of solution is A]Normality B]Molarity C]Molality D]Mole fraction The number of ml of a liquid solute pre 100 ml of solution is A] % weight by volume B]% V/V C]PPM D]Strength The weight of substance in gram ,that react with 1 gram of Hydrogen molecules or 8 gram of oxygen molecules or 35.5 gram of chlorine molecules is A] Molecular weight B] Part per million C] Equivalent weight D] Weight of substances Normality of acid = A] Molarity x Basicity B] Molarity x Acidity C] Molality x Acidity D] Molality x Basicity Normality of bases = A] Molarity x Basicity B] Molarity x Acidity C] Molality x Acidity D] Molality x Basicity How many grams required to make 2.0 N Oxalic acid A] 126 gram B] 6.3 gram C] 63 gram D] 12.6 gram How many gram required to make 500 ml of 0.1 N KMnO4 solution in acidic medium? A]1.56 gram

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1

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B] 31.6 gram C] 15.6 gram D] 3.16 gram 200 ml of 0.1 N HCl solution is diluted to 500 ml volume ,the normality of diluted solution is A] 40 N B] 4.0 N C] 0.4N D] 0.04 N The Equivalent weight of K2Cr2O7 (MW of K2Cr2O7= 294) A]294 B]490 C]49 D]29.4 The titration in which an acid react with base to formed a salt and water is called as A] Complexometric titration B] Precipitation titration C] Neutralisation titration D] Redox titration The volumetric titration is also called as A] Acid-Base titration B] Titrimetry C] ] Complexometric titration D] Precipitation titration The concentration is expressed in terms of ……….. A] Normality B]Molarity C]Molality D]Mole fraction Those substances which are available in pure form with definite chemical composition are called as A] Primary Standard B] Secondary Standard C] Pure Compound D] Impure Compound In acid –base titration it gives a sharp enough end point with an indicator ,the pH at an equivalent point is in between A] 3-7 B] 9-14 C]4-10 D]All Above Acid –base reaction is reversible ,the reaction can be shown as A] Acid + Base Conjugated Base + Conjugated Acid B] ] Acid + Base Conjugated Base + Conjugated Base C] Acid + Base Conjugated Acid + Conjugated Acid

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D] All above 26

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In Acid –Base titration , the titration involving bases contain ……….. which are carried out at Ice cold water. A] OH B]CO2 C]H2O D]N2 The substances which changes colour or changes turbidity at a certain pH ,is called as A] Mixed indicator B]Titration Indicator C] Fluorescent Indicator D]Acid- Base Indicator FeSO4 .H2O shows the following redox reaction A] Fe2+ Fe3+ + eB] Fe3+ Fe2+ + e2+ C] Fe Fe3+ - e3+ D] Fe Fe3+ - e-

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H2C2O4 .2H2O undergoes the following redox reaction A] C2 O4 2CO2 + 2 e3B] C2 O4 2CO2 + 2 eC] C2 O4 3CO2 + 2 e2D ]C2 O4 2CO2 + 2 eFor ionic Solid solution molarity (M) may be called as A] Molality(m) B] Normality(N) C] Formality(F) D] Concentration(C) If 8 gram of O2 react with 12 gram of Mg ,therefore equivalent weight of Mg is A] 0 B] 1 C] 8 D] 12 1 gram of H2 liberated on electrolytic decomposition of 36.5 gram of HCl ,thus equivalent weight of HCl is A] 36.5 B] 35.5 C] 1 D] 12.5 35.5 gram of Cl2 completes reaction with 23 gram of sodium ,than equivalent weight of sodium is A]0.35 B] 23 C]35.5 D] 0.23

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Diluted solution ,its concentration before dilution and after dilution is related as A] NFinal x VFinal = NInital x VInital B] NFinal x VInital= NInital x VFinal C] NInital x VFinal = NFinal x VInital D]All of above 1 . Phenolphthalein a. Yellow in acidic to blue in basic 2. methyl Orange b. Colourless in acidic to pink in basic 3. Bromothymole Blue c. yellow in basic to orange in acidic Match the above with respect to Strong Acid – Strong Base titration A] 1-c,2-b,3-a B] 1-b,2-c,3-a C] 1-a,2-b,3-c D] 1-a,2-c,3-b 1.Phenolphthalein a. Colourless to blue9(7.6 -9.4) 2.Thymolphthalein b . Colorless to pink (8.3- 10) 3Phenol Red c. yellow to Red (6.8- 8.4) Match the above A]1-a.2-b,3-c B]1-c,2-b,3-a C] 1-b,2-a,3-c D]1-b,2-c,3-a Which one of the following pieces of apparatus would you NOT use during this titration? 1. 2. 3. 4.

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Liebig condenser Conical flask Burette Pipette filler

The water of crystallisation in sodium carbonate may be determined by titration. Which one of the following statements about water of crystallisation is incorrect?

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All crystals contain water of crystallisation. A crystal is said to be dehydrated if it loses its water of crystallisation. 3. The value of X in the formula Na2CO3.XH2O must be a whole number. 4. The amount of water of crystallisation that occurs in a sample may vary from molecule to molecule. 39

A sample of vinegar was analysed and found to have a concentration of ethanoic acid equal to 1 mol/l. What will its concentration be expressed as % w/v?

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Mr(ethanoic acid) = 60 1. 2. 3. 4. 40

The relative molecular mass of sodium carbonate (Na2CO3) is 106. If 5.3 grams of anhydrous sodium carbonate is dissolved in deionised water and made up tp 500 ml in a volumetric flask, what will its concentration be? 1. 2. 3. 4.

41

1% w/v 60% w/v 6% w/v 61% w/v 2

1.0 molar 0.1 molar 0.5 molar 0.05 molar

A student was asked to make up a 10% w/v solution of sodim carbonate. Which one of the following methods should have been followed?

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Dissolve 10 g of the sodium carbonate in exactly 100 cm3 of water. 2. Dissolve 10 g of the sodium carbonate in water and make up to a mass of 100 grams by adding more water. 3. Dissolve 10 g of the sodium carbonate in water and make up to a volume of 1litre in a volumetric flask by adding more water. 4. Dissolve 10 g of the sodium carbonate in water and make up to a volume of 100 cm3 in a volumetric flask by adding more water. 42

A bottle labelled 20% CuSO4 contains 200 ml of the solution. How many grams of CuSO4 are there present in this solution? 1. 2. 3. 4.

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40 g 4000 g 200 g 20 g

A bottle is labelled 43% v/v of ethanol. This means that 1.

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there are 43 g of ethanol in every 100 g of the volume . 2. there are 430 ml of ethanol in every litre of the volume.

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there are 430 ml of ethanol in every 1000 g of the volume. 4. there are 43 g of ethanol in every 100 ml of the volume. 44

A concentrated solution is one which

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reacts readily with an acid or a base. has a large amount of solute compared to the amount of solvent. 3. has equal amounts of solute and solvent. 4. has a large amount of solvent compared to the amount of solute. 45

Which one of the following statements is true for the methyl orange indicator?

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It is orange in basic solutions and pink in acidic solutions. 2. It is blue in basic solutions and red in acidic solutions. 3. It is yellow in basic solutions and red in acidic solutions. 4. It is yellow in basic solutions and orange in acidic solutions 46

A certain bottle of mineral water has a stated chloride concentration of 28 ppm. How many mg of chlorides are present in a 250 ml bottle of this water? 1.

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2. 112 mg

3 0.007 mg 4 28 mg If 25 ml of 0.1 M solution of HCl was diluted to a volume of 500 ml, what is the new concentration of the HCl solution? 1.

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7 mg

200 M

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2. 20 M

3. 0.005 M 4 0.05 M Which one of the following solutions could NOT be used as a primary standard solution? 1. 2. 3. 4.

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Sodium chloride (NaCl) Anhydrous sodium carbonate (Na2CO3) Sodium hydroxide (NaOH) Hydrated sodium carbonate (Na2CO3.10H2O)

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A solution of sulfuric acid (Mr = 98) consists of 49 g of pure acid dissolved to make up a solution of volume 200 cm3. What is the concentration of this acid solution? 1. 2. 3. 4.

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200 ml 20 ml 50 ml 5 ml

A litre of concentrated hydrochloric acid (HCl) is spilt in the laboratory. If the concentration of the acid is 10 M, how much calcium carbonate (CaCO3) powder is needed to neutralise the spilt acid? {Mr(CaCO3) = 100} 1. 2. 3.

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0.000009 ppm 9 ppm 0.009 ppm 0.9 ppm

The reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) can be described by the equation: HCl + NaOH ---> NaCl +H2O If 100 ml of a solution of hydrochloric acid solution contains 0.01 mole of the acid, then what volume of 0.05 molar sodium hydroxide will exactly neutralise the acid? 1. 2. 3. 4.

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Burette and funnel Pipette and conical flask Burette and pipette Conical flask and funnel

In a water treatment plant, a chemist found that a water sample contains 0.009 g of calcium carbonate in a volume of 1 litre. What is this concentration expressed as ppm? 1. 2. 3. 4.

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0.5 mol/litre 24.5 mol/litre 2.5 mol/litre 0.245 mol/litre

Before performing a titration, two pieces of apparatus should be washed out with the solutions they are to contain. What are these two pieces of apparatus? 1. 2. 3. 4.

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1 kg 10 g 100 g

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4. 54

A student carried out four titrations between an acid and a base. The volumes of acid required to neutralise the base were recorded and were as follows: 19.6 cm3, 19.5 cm3, 19.3 cm3, 19.3 cm3. When performing his calculations, what value for voume of acid should he use? 1. 2. 3. 4.

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2.5 moles 0.025 mole 25 moles 4 moles

A 250 ml volumetric flask contains a 0.1 molar solution of sodium hydroxide (NaOH). How many grams of sodium hydroxide are there in this volume of solution? {Mr(NaOH) = 40} 1. 2. 3. 4.

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0.8 gram 0.4 gram 4 grams 0.02 grams

How many moles of sodium hydroxide (NaOH) are there in 250 ml of a 0.1 molar solution of sodium hydroxide? 1. 2. 3. 4.

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19.30 cm3 19.37 cm3 19.43 cm3 19.55 cm3

Calcium and hydrochloric acid react together according to the equation Ca + 2HCl ---> CaCl2 + H2 What mass of calcium will completely react with 200 ml of 0.1 M HCl solution? Ar(Ca) = 40 1. 2. 3. 4.

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0.01 g

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4g 10 g 1g 40 g

Before starting the titration, the pipette, burette and conical flask are rinsed with deionised water and NOT tap water.

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Why is this?

1. The acid, when placed in the burette will become more dilute if tap water rather than deionised water is used to rinse the burette. 2. The colour change at the end-point of the titration is more noticeable if deionised water is used. 3. Ions in the tap water may 'clog up' the tap of the burette. 4. Tap water contains ions that may affect the titration result.