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प्रश्न
What is the colour of the flame of sodium and potassium?
उत्तर
The colour of the flame of sodium is golden yellow, and the colour of the flame of potassium is pale violet.
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संबंधित प्रश्न
Choose the correct answer from the choice given:
In the periodic table, alkali metals are placed in the group __________
Lithium, sodium, and potassium elements were put in one group on the basis of their similar properties. What are those similar properties?
How the reaction can proceed continuously?
Match the Column A with Column B.
| Column A | Column B | ||
| (a) | Water | 1. | Lithium |
| (b) | Alkali metal | 2. | Iodine |
| (c) | Halogen | 3. | Covalent compound |
| (d) | Calcium oxide | 4. | Acetic acid |
| (e) | Weak acid | 5. | Ionic compound |
| 6. | Sulphuric acid | ||
Assertion (A): Alkali metals do not form dipositive ions.
Reason (R): After loss of one electron alkali metals achieve a stable electronic configuration of noble gases.
In the periodic table alkali metals are placed in the group ______.
This question refers to the elements of the Periodic Table with atomic numbers from 3 to 18. Some of the elements are shown by letters, but the letters are not the usual symbols of the elements.
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| A | B | C | D | E | F | G | H |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| I | J | K | L | M | N | O | P |
Which of these is an alkali metal?
