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प्रश्न
Write the formula of the following compound:
Aluminium hydroxide
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उत्तर
Aluminium hydroxide - Al[OH]3 - `"Al"^(3+)["OH"]^(1-)`
संबंधित प्रश्न
Write the chemical formula of the Calcium oxide.
What is the significance of the formula of a substance ?
Work out the formula for sulphur dioxide. (Valencies : S = 4 ; O = 2)
Correct the following statement:
Formula of iron (lll) oxide is FeO.
Match the following:
| Column A | Column B |
| (a) Pb(NO3)2 | (i) rotten eggs smell |
| (b) CO2 | (ii) burns with a pop sound |
| (c) (NH4)2Cr2O7 | (iii) the suffocating smell of sulphur |
| (d) HCI | (iv) lime water turns milky |
| (e) NO2 | (v) crackling sound |
| (f) O2 | (vi) residue swells up |
| (g) H2 | (vii) brown gas |
| (i) H2S | (viii) supports combustion |
| (j) SO2 | (ix) fumes with NH3 solution |
What is a chemical formula? What is the significance of a formula?give an example to illustrate?
Name the element in the compound and give the formula of the following compound:
Green vitriol
Write the formula of the following compound:
Potassium bisulphite
Write the formula of the following compound:
Sodium aluminate
Write the formula of the following compound:
Calcium nitrate
Write the formula of the following compound:
Aluminium nitrate
Write the formula of the following compound:
Copper [II] sulphide
Write the formula of the following compound:
Copper [II] sulphate
Write the formula of the following compound:
Iron [II] oxide
Write the formula of the following compound:
Iron [III] sulphate
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
BaCl2
What do you understand by chemical formula of a compound? What is its significance?
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.
