Concentrated acid group: halides, nitrate, oxalate

37 questions on Concentrated acid group: halides, nitrate, oxalate from the Qualitative Analysis: Anions chapter: 7 NEET level, 17 JEE Main, 13 JEE Advanced. Each one opens with its answer and solution.

• Which of the following silver halides dissolves readily in dilute aqueous ammonia? NEET level
• Solid NaCl is heated with MnO2 and conc. H2SO4. The gas evolved and its colour are NEET level
• In the brown ring test for nitrate, the brown ring at the junction of the two liquid layers is due to NEET level
• Chlorine water is added dropwise, with shaking, to a solution containing iodide, with a little CCl4 present. The CCl4 layer first turns violet. On adding excess... JEE Main level
• A halide salt solution gives a pale yellow precipitate with AgNO3. The precipitate is only sparingly soluble in dilute ammonia but dissolves in conc. ammonia. T... JEE Main level
• Solid K2Cr2O7 and conc. H2SO4 are heated with each of the following chlorides. Among the following, which one gives the red-orange vapours of chromyl chloride? JEE Main level
• Chromyl chloride vapours are passed into aqueous NaOH: CrO2Cl2 + 4NaOH -> Na2CrO4 + 2NaCl + 2H2O. The oxidation states of Cr in CrO2Cl2 and in Na2CrO4 and the n... JEE Main level
• A sodium salt is warmed with conc. H2SO4 and the gas mixture (H2C2O4 -> CO + CO2 + H2O for the acid formed) is passed through conc. NaOH solution. The gas that ... JEE Main level
• A nitrate is heated with copper turnings and conc. H2SO4: Cu + 2NO3^- + 4H+ -> Cu^2+ + 2NO2 + 2H2O. The number of moles of brown gas formed per mole of copper c... JEE Main level
• Assertion: In the brown ring test, conc. H2SO4 is poured slowly along the wall of the tube. Reason: Conc. H2SO4 is denser than the aqueous mixture, so it forms ... JEE Main level
• Match the anion in List I with the observation on warming its solid with conc. H2SO4 in List II. List I: (P) Cl^- (Q) Br^- (R) I^- (S) C2O4^2- List II: (1) colo... JEE Main level
• Which of the following statements about the chromyl chloride test are correct? JEE Advanced level
• Treat NO as NO+ in the brown-ring complex [Fe(H2O)5NO]^2+, which is high spin. Which statements are correct? JEE Advanced level
• Which of the following statements about the silver halides are correct? JEE Advanced level
• A solution contains NaNO3 and NaBr and a student does the brown ring test directly. A dark brown colour appears at the junction, which cannot be attributed to n... JEE Advanced level
• A 2.34 g sample of pure NaCl is heated with excess solid K2Cr2O7 and conc. H2SO4 to give CrO2Cl2 (4NaCl + K2Cr2O7 + 6H2SO4 -> 2CrO2Cl2 + 4NaHSO4 + 2KHSO4 + 3H2O... JEE Advanced level
• A sodium salt X gives with MnO2 and conc. H2SO4 a greenish-yellow gas, a white precipitate with AgNO3 that dissolves in dilute ammonia, and red vapours with K2C... JEE Advanced level
• A sodium salt X gives violet vapours with conc. H2SO4 and a bright yellow precipitate with AgNO3 insoluble in conc. ammonia. Chlorine water with CCl4 turns the ... JEE Advanced level
• A white sodium salt Y gives no precipitate with BaCl2 and dilute HCl, gives a white precipitate with CaCl2 that is insoluble in acetic acid, and on warming with... JEE Advanced level
• Solid sodium chloride is warmed with concentrated sulphuric acid. The gas that gives dense white fumes with a glass rod dipped in aqueous ammonia is: NEET level
• Which solid, on warming with concentrated sulphuric acid, evolves violet vapours? NEET level
• Aqueous silver nitrate is added to potassium bromide solution acidified with dilute nitric acid. The precipitate is: NEET level
• Sodium oxalate is warmed with concentrated H2SO4 and the evolved gas mixture is passed through concentrated KOH solution. The remaining gas burns with a blue fl... NEET level
• Copper turnings are warmed with a nitrate and concentrated H2SO4; a brown gas is evolved and the solution turns blue. Write the net ionic equation with smallest... JEE Main level
• A sodium halide is heated with MnO2 and concentrated H2SO4. Reddish-brown vapours are evolved, which colour carbon tetrachloride orange-brown. The halide is one... JEE Main level
• Chlorine water is added dropwise, with shaking, to a solution of potassium iodide over a layer of chloroform, and then added in large excess. The chloroform lay... JEE Main level
• Assertion: Silver iodide does not dissolve even in concentrated aqueous ammonia. Reason: Silver iodide is yellow in colour. JEE Main level
• Match the anion (List I) with the observation on warming its salt with concentrated H2SO4 (List II). List I: P Cl-, Q I-, R C2O4^2-, S NO3- (with copper turning... JEE Main level
• Sodium halides are warmed with concentrated H2SO4. Select all correct statements. JEE Main level
• Select all correct statements about the oxalate ion in qualitative analysis. JEE Main level
• Aqueous lead nitrate is added to a solution of a sodium salt. A bright yellow precipitate forms that dissolves on boiling and reappears as shiny golden-yellow s... JEE Main level
• A 2.00 g solid mixture contains only NaCl and NaBr, with NaCl forming 35.0% of the mass. The mixture is dissolved in water and treated with excess AgNO3 solutio... JEE Main level
• A colourless sodium salt X, when warmed with concentrated H2SO4, gives violet vapours and also a gas that blackens lead acetate paper. Its aqueous solution give... JEE Advanced level
• A solution contains 0.010 M each of Cl-, Br- and I-. Dilute AgNO3 is added slowly (ignore volume change). Given K_sp: AgCl 1.8x10^-10, AgBr 5.0x10^-13, AgI 8.5x... JEE Advanced level
• Chlorine water is added to separate solutions of sodium halides, each shaken with CCl4, the second addition being in large excess. Select all correct statements... JEE Advanced level
• 1.34 g of anhydrous Na2C2O4 (Na 23, C 12, O 16) is warmed with excess concentrated H2SO4. The gas mixture is passed through excess concentrated KOH solution and... JEE Advanced level
• A white salt X: (i) warmed with copper turnings and concentrated H2SO4 gives a brown gas and a blue solution; (ii) warmed with aqueous NaOH gives a gas turning ... JEE Advanced level