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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 |
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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| 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 |
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