Related InterviewSolutions

• Phosphoric acid `(H_(3)PO_(4))` is tribasic acid and one of its salt is sodium dihydrogen phosphate `(NaH_(2)PO_(4))`. What volume of 1 M NaOH solution should be added to 12 g of sodium dihydrogen phosphate (mol. Wt. 120) to exactly convert it into trisodium phosphate `Na_(3)PO_(4)`A. 80 mlB. 100 mlC. 200 mlD. 300 ml
• Weight of `Ca(OH)_(2)` needed to prepare 250 ml of solution with pH=13A. 0.925 gB. 0.0125 gC. 0.25 gD. 1 g
• Which indicator can be used in the titration of strong acid and strong baseA. Only phenoplphthaleinB. Only methyl orangeC. Eitehr of the twoD. Red litmus
• If we use phenolphthalein as an indicator in a titration of `Na_(2)CO_(3)` with HCl, the usual result isA. No visible change is occurB. The indicator reacts with the acidC. The indicator reacts with the baseD. Sodium chloride and carbonic acid will be formed
• How many grams of NaOH are equivalent to 100 ml of 0.1 N oxalic acidA. 0.2B. 2C. 0.4D. 4
• 0.53 gm of `Na_(2)CO_(3)` has been dissolved in 100 ml of a sodium carbonate solution. The normality of the solution will beA. `(N)/(5)`B. `(N)/(2)`C. `(N)/(10)`D. N
• A 0.1 N solution of `Na_(2)CO_(3)` is titrated with 0.1 N HCl solution. The best indicator to be used isA. Potassium ferricyanideB. PhenolphthaleinC. Methyl redD. Litmus Paper
• 25 ml of a solution of `Na_(2)CO_(3)` having a specific gravity of 1.25 required 32.9 ml of a solution of HCl containing 109.5 grams of the acid per litre for complete neutralization. Calculate the volume of 0.84N-`H_(2)SO_(4)` that will be completely neutralized by 125 grams of the `Na_(2)CO_(3)` solutionA. 460 mlB. 540 mlC. 480 mlD. 470 ml
• The number of hydroxide ions, produced by one molecule of sodium carbonae `(Na_(2)CO_(3))` on hydrolysis isA. 2B. 1C. 3D. 4
• Mark the compound which turns black with `NH_(4)OH`A. Lead chlorideB. Mercurous chlorideC. Mercuric chlorideD. Silver chloride