Tincture of iodine has antiseptic properties. This solution is made by dissolving
(a) iodine in potassium iodide
(b) iodine in vaseline
(c) iodine in water
(d) iodine in alcohol
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A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed.
KCl (aq) + AgNO3 (aq) → AgCl (s) + KNO3 (aq) It is a double displacement and precipitation reaction.
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A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains
(d) starch,is the correct option.
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The density of solution prep. by dissolving 120g urea in 1kg h2o is 1.15g/mL. Molarity?
As We know that Density of solution = Mass of solution / Volume of solution therefore , volume of solution = Mass / density = 120+1000 g/ 1.15 g ml-1 = 1120...
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Bone matrix is rich in (a) fluoride and calcium (b) calcium and phosphorus (c) calcium and potassium (d) phosphorus and potassium
(b) calcium and phosphorus
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A solution is made by dissolving sodium chloride in water and its concentration is expressed as 0.9% by mass.
0.9% mass by mass means 0.9 gm NaCl in 100 gm of solution Therefore, Given mass of solute (NaCl) = 0.9 gm Molar mass of NaCl = 23 + 35.5 = 58.5...
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Name a compound which is used as antiseptic as well as disinfectant.
Solution of phenol : 0.2% antiseptic, 2% disinfectant.
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Potassium chlorate (KCIO3) on heating forms potassium chloride and oxygen. Write a balanced equation for this reaction.
2KCIO3 (s) ------>2KCl(s ) + 3O2(g)
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(i) What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?
(i) A yellow precipitate of lead iodide (PbI2) is formed. (ii) Precipitation reaction/Double displacement reaction. (iii) Pb(NO3)2(aq) + 2KI(aq) ------> PbI2(s) + 2KNO3 (aq) Lead nitrate Potassium iodide Lead iodide Potassium nitrate ...
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Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
(a) physical change that can be reversed.
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While using iodine in the laboratory, some drops of iodine fell on Paheli’s socks and some fell on her teacher’s saree.
The saree of Paheli’s teacher might have been starched, and starch turns blue black with iodine solution. Paheli’s socks did not have starch on it thereby showing no change.
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