কাজ
ক্যারিস; এনামেল, গহ্বর, দাঁতের গহ্বর, দন্ত ক্ষয়, দাঁতের স্বাস্থ্য, আংশিক ডেনচার পরিধানকারীরা প্রাকৃতিক এনামেলের পরিধান করে, দাঁতের সংবেদনশীলতা, ট্রেস উপাদান ঘাটতি, দাঁত পিষে প্রাকৃতিক এনামেল পরিধান, পিতামাতার পুষ্টি চিকিৎসায় নির্দেশিত হয়।
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What is the colour Barium Chloride and Sodium Sulphate Salts?
The colour of both barium chloride and sodium sulphate is white.
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What is the colour Barium Chloride and Sodium Sulphate Salts?
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Calculate the mass per cent of different elements present in sodium sulphate (Na2SO4).
Solution: From formula Mass % of an element = Molar mass of component/Molar mass of compound ×100 The molecular formula of compound (Na2SO4) is = [(2 × 22.99) + (32.06) + 4 (16.00)] =...
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Calculate the mass of sodium acetate (CH3COONa) required to make 500 mL of 0.375 molar aqueous solution.
Answer: Given that 0.375 Molar aqueous solution Molar represent molarity of the solution Hence given molarity of solution will 0.375M Formula of molarity Molarity (M) = No. of moles of solute / volume of solution in...
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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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What are isoelectronic ions? Account for the decrease in size of following species oxide ion > Fluoride ion > sodium ion > magnesium ion.
The ions having same number of electrons are called isoelectronic ions. The above order is due to increasing order of effective nuclear charge.
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The formation of sodium chloride from gaseous sodium and gaseous chloride is a redox process. Justify.
Na atom get oxidize and Cl is reduced
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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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Write down the formula of (i) sodium oxide (ii) aluminium chloride (iii) sodium suphide (iv) magnesium hydroxide
(i) Sodium oxide → Na2O (ii) Aluminium chloride → AlCl3 (iii) Sodium suphide → Na2S (iv) Magnesium hydroxide → Mg(OH)2
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The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.
A sodium atom and ion, differ by one electron. For 100 moles each of sodium atoms and ions there would be a difference of 100 moles of electrons. Mass of 100...
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