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प्रश्न
Write the formula of the following compound:
Calcium bicarbonate
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उत्तर
Calcium bicarbonate - Ca[HCO3]2 - `"Ca"^(2+)["HCO"_3]^(1-)`
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संबंधित प्रश्न
What is meant by the term chemical formula?
Write the chemical formula of the Calcium oxide.
The radius of an oxygen atom is 0.073 nm. What does the symbol ‘nm’ represent ?
Name the following compounds. Also write the symbols/formulae of the ions present in them :
- CuSO4
- (NH4)2SO4
- Na2O
- Na2CO3
- CaCl2
Which of the following represents a correct chemical formula ?
Name the element in the compound and give the formula of the following compound:
Carbonic acid
Name the element in the compound and give the formula of the following compound:
Acetic acid
Write the formula of the following compound:
Potassium sulphate
Write the formula of the following compound:
Calcium nitrate
Write the formula of the following compound:
Magnesium chloride
Write the formula of the following compound:
Zinc sulphate
Write the formula of the following compound:
Tetra amine copper [II] sulphate
Write the formula of the following compound:
Iron [II] hydroxide
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
NaZnO2
Which of the following represents a correct chemical formula? Name it.
Write the molecular formulae of all the compounds that can be formed by the combination of the following ions
Cu2+, Na+, Fe3+, C1– , `"SO"_4^-2`, `"PO"_4^3-`
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.
