Titration and Salt Analysis Quiz ( batch-8)best of luck 1 / 58Which of the following indicators is commonly used in EDTA titrations Phenolphthalein Methyl orange Eriochrome Black T Bromothymol blue 2 / 58EDTA is a ......dentate ligand because it has how many donor atoms 2 3 5 6 3 / 58Which of the following metals does NOT form a stable complex with EDTA? Ca²⁺ Mg²⁺ Fe²⁺ Na⁺ 4 / 58The color change at the endpoint of an EDTA titration using Eriochrome Black T occurs because of Precipitation of the metal ion Formation of a colored metal complex Liberation of hydrogen ions Change in oxidation state 5 / 58The pH range for the proper working of Eriochrome Black T in complexometric titration is 1-3 3-5 6-8 9-11 6 / 58In a titration of calcium with EDTA, which buffer is commonly used Acetate buffer Phosphate buffer Ammonia-ammonium chloride buffer Borate buffer 7 / 58Which of the following statements about EDTA is incorrect? It forms a 1:1 complex with most metal ions It has four carboxylate groups It has two amine groups It is only soluble in acidic solutions 8 / 58The endpoint in a complexometric titration is detected by Precipitation of a metal salt A sudden pH drop A color change of the metal-indicator complex Evolution of gas 9 / 58The masking agent used in the determination of calcium in the presence of magnesium is Ammonium chloride Potassium cyanide Triethanolamine Potassium hydroxide 10 / 58What is the function of a masking agent in complexometric titration To enhance metal-ligand complex formation To change the color of the indicator To prevent interference from unwanted metal ions To reduce the solubility of the metal complex 11 / 58In which type of titration does back titration become necessary in complexometry When the endpoint is not sharp When the metal reacts too slowly with EDTA When the complex is too weak to be detected All of above 12 / 58Determination of metal in an alloy can be found easily by acid base titration complexometric titration redox titration precipitation titration 13 / 58The titration of Zn²⁺ with EDTA is best performed at what pH? 3 7 10 13.3 14 / 58Which ligand other than EDTA is used for complexometric titration? NH₃ cyanide DTPA (Diethylene triamine pentaacetic acid) sulphate 15 / 58Which of the following conditions increases the stability of a metal-EDTA complex? Lower temperature Decreasing ionic strength Higher pH Higher pressure 16 / 58In complexometric titrations, why is a buffer used To maintain the solubility of the metal complex To adjust the pH for maximum complex stability To oxidize metal ions To precipitate interfering ions 17 / 58The conditional stability constant (K') of a metal-EDTA complex is dependent on Temperature only pH and free ligand concentration Buffer concentration only Indicator concentration 18 / 58Which of the following statements about the direct titration method in complexometry is true A back titration is always required The metal-EDTA complex must be unstable The reaction must proceed rapidly to completion The indicator must be colorless 19 / 58Which of the following indicators is commonly used in the Mohr method of precipitation titration Methyl orange Fluorescein Dichlorofluorescein Potassium chromate 20 / 58Which of the following titrants is used in Volhard’s method AgNO₃ NH₄SCN NaCl K₂CrO₄ 21 / 58What is the main principle of the Fajans method of precipitation titration? Formation of a colored precipitate Use of an adsorption indicator Formation of a soluble complex Use of acid-base indicators 22 / 58Which of the following indicators is used in the Fajans method Phenolphthalein Fluorescein Methyl red Potassium chromate 23 / 58The endpoint in the Mohr method is indicated by the formation of A white precipitate A red precipitate A yellow solution A blue solution 24 / 58Which of the following conditions is required for the Mohr method to work accurately Acidic medium (pH < 4) Neutral to slightly alkaline medium (pH 6-9) Strongly basic medium (pH > 12) Any pH can be used 25 / 58In Volhard’s method, what is the function of ferric ions (Fe³⁺)? To act as a catalyst To prevent precipitation To serve as an indicator To complex with silver ions 26 / 58Which of the following titration methods uses back titration Volhard method Mohr method Fajans method Argentometric titration 27 / 58What is the major limitation of the Mohr method? It cannot be used in acidic solutions It requires a colored indicator It is only applicable to sulfate ions It requires an external indicator 28 / 58Which of the following salts can interfere with precipitation titrations? NaCl AgNo3 Pb(NO₃)₂ Na₂SO₄ 29 / 58Why is Volhard’s method performed in an acidic medium? To prevent hydrolysis of Ag⁺ To ensure complete precipitation of AgCl To keep Fe³⁺ in solution To increase the solubility of the precipitate 30 / 58Which of the following statements about the endpoint and equivalence point in titration is TRUE They are always the same Endpoint is a theoretical point, while equivalence point is observed Equivalence point is the actual completion of reaction, while endpoint is indicated by a color change Endpoint always occurs after the equivalence point 31 / 58Which type of titration is used to determine the amount of vitamin C in a solution? Acid-base titration Redox titration Precipitation titration Complexometric titration 32 / 58Hardness of water can be found by which titration acid base titration complexometric titration precipitation titration redox titration 33 / 58Which of the following tests is used to detect the presence of sodium ions in a dry test? Cobalt nitrate test Lassaigne’s test Flame test Borax bead test 34 / 58In a flame test, lithium gives which characteristic color Yellow red green blue 35 / 58The borax bead test is mainly used to detect which type of elements? Alkali metals Alkaline earth metals Transition metals Halogens 36 / 58Which gas is released when a carbonate salt is heated during a dry test? H2 O2 N2 none 37 / 58Which reagent is commonly used in the dry test for sulfates Barium chloride Silver nitrate Potassium permanganate Lead acetate 38 / 58What color does copper produce in the flame test Blue-green Blue-yellow Blue-brown Blue-reddish 39 / 58The cobalt nitrate test is used to identify which type of compounds Carbonates and nitrates Halides Phosphates and aluminum compounds Sulfates 40 / 58Which of the following is NOT a dry test? Flame test Borax bead test Charcoal cavity test Precipitation test 41 / 58The flame test is commonly used to detect which type of elements? Non-metals Transition metals Alkali and alkaline earth metals Halogens 42 / 58The presence of Fe³⁺ ions can be confirmed by adding potassium ferrocyanide, which gives a White precipitate Deep blue precipitate Brown ring formation Black precipitate 43 / 58Which reagent is used to detect ammonium (NH₄⁺) ions? Sodium hydroxide (NaOH) Barium chloride (BaCl₂) Silver nitrate (AgNO₃) Potassium dichromate (K₂Cr₂O₇) 44 / 58In the group analysis of basic radicals, which cations are precipitated as chlorides in Group I? Na⁺, K⁺ Pb²⁺, Hg₂²⁺, Ag⁺ Fe²⁺, Fe³⁺ Cu²⁺, Zn²⁺ 45 / 58A brown ring test is performed for the detection of which radical? Cu²⁺ Fe³⁺ NO₃⁻ Pb²⁺ 46 / 58What is the confirmatory test for calcium (Ca²⁺) ions? Ammonium molybdate test White precipitate with ammonium oxalate Formation of brown ring Blue solution with sodium hydroxide 47 / 58Which of the following acid radicals gives effervescence with dilute acids? Sulfate (SO₄²⁻) Carbonate (CO₃²⁻) Chloride (Cl⁻) Nitrate (NO₃⁻) 48 / 58The presence of chloride (Cl⁻) ions is confirmed using: Silver nitrate (AgNO₃) solution Barium chloride (BaCl₂) solution Potassium dichromate (K₂Cr₂O₇) Ammonium oxalate 49 / 58When lead acetate is added to a solution containing a sulfide (S²⁻) ion, what is observed White precipitate Black precipitate Yellow precipitat Blue precipitate 50 / 58What is the confirmatory test for phosphate (PO₄³⁻) ions Brown ring test White precipitate with ammonium molybdate Effervescence with acid Yellow precipitate with AgNO₃ 51 / 58Which acid radical is confirmed by the formation of a yellow precipitate with silver nitrate F Cl Br I 52 / 58Which of the following acid radicals can be detected using a ferric chloride (FeCl₃) test? Acetate (CH₃COO⁻) Carbonate (CO₃²⁻) Sulfate (SO₄²⁻) Nitrate (NO₃⁻) 53 / 58The salt containing which acid radical produces a yellow residue on heating with concentrated nitric acid? Phosphate (PO₄³⁻) Sulfate (SO₄²⁻) Sulfite (SO₃²⁻) none 54 / 58The reaction of sulfuric acid with a chloride salt produces which gas? H₂S CO₂ HCl NO₂ 55 / 58What is the characteristic flame color for potassium salts in a flame test? yellow green red violet 56 / 58Which reagent is used to distinguish between sulfate (SO₄²⁻) and sulfite (SO₃²⁻) ions? Ammonium hydroxide Barium chloride Potassium permanganate Silver nitrate 57 / 58In the charcoal cavity test, which reagent is commonly used as a reducing agent? Ammonium hydroxide Potassium dichromate Sodium carbonate Sodium carbonate and charcoal 58 / 58A green residue observed after performing the charcoal cavity test indicates the presence of: Fe Ba Cu Mn Your score isThe average score is 70% 0% Restart quiz
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