Bottle A contains oxalic acid and bottle B contains sodium carbonate solution. When pH paper is dipped in each of the solutions, the colour seen in A and B respectively be --------.
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Write two important uses of each of the following: (i)Sodium carbonate (ii)Sodium Hydroxide (iii)Sodium hydrogen carbonate
(i) Sodium carbonate :for softening of hard water ,laboratory reagent. (ii) Sodium hydroxide: in the manufacture of soap, in the purification of bauxite. (iii) Sodium hydrogen carbonate: as a mild antiseptic, as...
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150 mL of 0.5 N nitric acid solutions at 25.35^0C was mixed with 150 mL of 0.5 N sodium hydroxide solutions at the same temp.
Total mass of solution = 150 + 150 = 300 g Q = Total heat produced = 300 x (28.77-25.35) cal =300 x 3.42= 1026 cal Heat of neutralization = Q/150 x 1000 x...
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A student prepared solutions of (i) an acid and (ii) a base in two separate beakers. She forgot to label the solutions and litmus paper
These solutions can be tested by using universal indicators. If the solution (i) turns red it is an acid and If the solution (ii) remains colourless it is a base.
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Classify the following salts into acidic, basic and neutral- Potassium sulphate, ammonium chloride, sodium carbonate, sodium chloride.
Neutral Salts :Potassium sulphate, sodium chloride Basic Salts: Sodium carbonate Acidic Salts: Ammonium chloride
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Give suitable reasons An aqueous solution of sodium chloride is neutral but an aqueous solution of sodium carbonate is basic.
Sodium chloride is a salt of strong acid HCI and strong base NaOH, so it is neutral. Sodium carbonate is a salt of weak acid H2CO3 and strong base NaOH,...
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Why in the redox titration of KMnO4 vs oxalic acid, we heat oxalic acid solution before starting the titration?
The reaction between KMnO4 and oxalic acid is very slow. By raising the temperature we can enhance the rate of reaction.
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When KMnO4 solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because
(iv) Mn2+ acts as autocatalyst.
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If bottle full of concentrated sulphuric acid is left open in the air by accident, the acid starts flowing out of the bottle of its own.
Concentrated sulphuric acid is highly hygroscopic. It absorbs moisture from air and gets diluted. Since the volume increases, the acid starts flowing out of bottle.
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How is sodium hydrogen carbonate from a mixture of NH4Cl and NaHCO3 in the manufacture of sodium carbonate by Solvay process.
Sodium hydrogen carbonate (NaHCO3) is sparingly soluble or less soluble in water and it gets separated as a precipitate while NH4Cl remains in solution. This precipitate is removed by filtration. NaCl...
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The equation √3 sin x + cos x = 4 has (1) Only one solution (2) Two solutions (3) Infinitely many solutions (4) No solution
Correct option (4) No solution Explanation : Given equation √3 sin x + cos x = 4 Which is of the form a sinx + b cos x = c with a = √3, b = 1, c...
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