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प्रश्न
Match the elements given in Column I with the colour they impart to the flame given in Column II.
| Column I | Column II |
| (i) Cs | (a) Apple green |
| (ii) Na | (b) Violet |
| (iii) K | (c) Brick red |
| (iv) Ca | (d) Yellow |
| (v) Sr | (e) Crimson red |
| vi) Ba | (f) Blue |
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उत्तर
| Column I | Column II |
| (i) Cs | (f) Blue |
| (ii) Na | (d) Yellow |
| (iii) K | (b) Violet |
| (iv) Ca | (c) Brick red |
| (v) Sr | (e) Crimson red |
| vi) Ba | (a) Apple green |
Explanation:
(i) Caesium imparts blue color when introduced into flame.
(ii) Sodium imparts yellow color when introduced into flame.
(iii) Potassium imparts violet color when introduced into flame.
(iv) Calcium imparts brick red color when introduced into flame.
(v) Strontium imparts crimson red color when introduced into flame.
(vi) Barium imparts apple green color when introduced into flame.
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संबंधित प्रश्न
Find the oxidation state of sodium in Na2O2.
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State as to why a solution of Na2CO3 is alkaline?
Write a balanced equation for the reaction between Na2O2 and water.
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The formula of soda ash is ______.
A chemical A is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in whitewashing due to disinfectant nature. What is the chemical formula of A?
When Zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion(s)?
(i) H+ ions
(ii) Mg2+ ions
(iii) Ca2+ ions
(iv) \[\ce{SO^{2-}4}\] ions
In the Solvay process, can we obtain sodium carbonate directly by treating the solution containing (NH4)2CO3 with sodium chloride? Explain.
Match the compounds given in Column I with their uses mentioned in Column II.
| Column I | Column II |
| (i) CaCO3 | (a) Dentistry, ornamental work |
| (ii) Ca(OH)2 | (b) Manufacture of sodium carbonate from caustic soda |
| (iii) CaO | (c) Most negative E value among alkali O metals. |
| (iv) CaSO4 | (c) Manufacture of high-quality paper |
| (d) Used in white washing |
Amongst baking soda, caustic soda and washing soda, carbonate anion is present in ______.
The pair of compounds which cannot exist together in solution is ______.
