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प्रश्न
Write the formula of the following compound:
Lead [II] nitrate
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उत्तर
Lead [II] nitrate - Pb[NO3]2 - `"NO"_3^(1-)`
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संबंधित प्रश्न
Write down the formulae of magnesium hydroxide.
What do the symbols, H2, S and O4 mean in the formula H2SO4 ?
(a) Write the symbols/formulae of two simple ions and two compound ions (or polyatomic ions).
An element Y has a valency of 4. Write the formula for its :
- chloride
- oxide
- sulphate
- carbonate
- nitrate
The formula of the nitride of a metal X is XN, state the formula of :
- its sulphate
- its hydroxide.
Write the formula of the following compound:
Potassium iodide
Write the formula of the following compound:
Potassium nitrite
Write the formula of the following compound:
Potassium bisulphite
Write the formula of the following compound:
Sodium sulphate
Write the formula of the following compound:
Sodium nitrite
Write the formula of the following compound:
Magnesium nitrate
Write the formula of the following compound:
Magnesium bicarbonate
Write the formula of the following compound:
Aluminium carbonate
Write the formula of the following compound:
Copper [I] chloride
Define the term Relative atomic mass. State why indirect methods are utilised to determine the absolute mass of an atom. Explain in brief the indirect method used.
Give the chemical formulae for the following compounds and compute the ratio by mass of the combining elements in each one of them. (You may use appendix-III).
- Ammonia
- Carbon monoxide
- (Hydrogen chloride
- Aluminium fluoride
- Magnesium sulphide
Complete the following crossword puzzle (Fig. 3.1) by using the name of the chemical elements. Use the data given in Table.
| Across | Down | ||
| 2 | The element used by Rutherford during his α–scattering experiment | 1 | A white lustrous metal used for making ornaments and which tends to get tarnished black in the presence of moist air |
| 3 | An element which forms rust on exposure to moist air | 4 | Both brass and bronze are alloys of the element |
| 5 | A very reactive non–metal stored under water | 6 | The metal which exists in the liquid state at room temperature |
| 6 | Zinc metal when treated with dilute hydrochloric acid produces a gas of this element which when tested with burning splinter produces a pop sound. | 8 | An element with symbol Pb |
Play a game for writing formula.
Example 2: A low-cost model for writing formulae: Take empty blister packs of medicines. Cut them in groups according to the valency of the element, as shown in the figure. Now, you can make formulae by fixing one type of ion into other.
For example:
The formula for sodium sulphate:
2 sodium ions can be fixed on one sulphate ion.
Hence, the formula will be Na2SO4.
Do it yourself:
Now, write the formula of sodium phosphate.
