কাজ
তীব্র বিকিরণ অসুস্থতা, ফোলেটের অভাব, গলগন্ড, হাইপোথাইরয়েডিজম, আয়োডিনের ঘাটতি, আয়রন ডেফিসিয়েন্সি (আইডি), থাইরয়েড ক্যান্সার, পুষ্টি সম্পূরক, ত্বক জীবাণুমুক্তকরণ, মৌখিক নির্বীজন চিকিৎসায় নির্দেশিত হয়।
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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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Give reasons (a) Platinum, gold and silver are used to make jewellery. (b) Sodium, potassium and lithium are stored under oil.
(a) Platinum, gold, and silver are used to make jewellery because they are very lustrous. Also, they are very less reactive and do not corrode easily. (b) Sodium, potassium, and lithium...
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Write equations for the reactions of (i) iron with steam (ii) calcium and potassium with water
(i) Iron react with steam to form the metal oxide and hydrogen. 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g) (ii) The reaction of calcium with water is exothermic but the heat evolved...
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Write equations for the reactions of (i) iron with steam (ii) calcium and potassium with water
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(a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
(a) Yes. The atoms of all the three elements lithium, sodium, and potassium have one electron in their outermost shells. (b) Both helium (He) and neon (Ne) have filled outermost shells....
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Does Fajans' rules apply to lithium iodide?
Lithium (1+) has a relatively small charge density (as it is quite large, and low charge), and that Iodine is large and has a high charge. So according to Fajans...
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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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Tincture of iodine has antiseptic properties. This solution is made by dissolving (a) iodine in potassium iodide
(d) iodine in alcohol
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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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