কাজ
কাশি, তীব্র, হেলিকোব্যাক্টর পাইলোরি সংক্রমণ 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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Which one of the following nutrients is not available in fertilizers? (a) Nitrogen (b) Phosphorus (c) Iron (d) Potassium
Correct answer is (c) Iron
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Explain why Sodium is less reactive than Potassium?
Due to less metallic character of sodium
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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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(i) What is the covalency of N in N2O5 ? (ii) Explain why phosphorus forms pentachloride whereas nitrogen and bismuth do not ?
[Hint : (i) 4 (ii) Because due to presence of vacant d-orbitals in the octet of 'p', it can expand its octet to form PCl5, while N cannot expand its octet.]
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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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