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प्रश्न
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
Ca2(PO4)3
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उत्तर
Ca2(PO4)3
Correct formula – Ca3(PO4)2
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संबंधित प्रश्न
Write down the formulae of magnesium hydroxide.
Write down the formulae for the following compounds :
Magnesium hydroxide
If the valency of hydrogen is 1 and that of nitrogen is 3, work out the formula for ammonia.
Correct the following statement:
A molecular formula represents an element.
Correct the following statement:
Molecular formula of water is H2O2
Give the empirical formula of : Benzene C6H6
Give the empirical formula of Acitic Acid CH3COOH.
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 |
Name the element in the compound and give the formula of the following compound:
Glauber’s salt
Write the formula of the following compound:
Sodium sulphite
Write the formula of the following compound:
Magnesium chloride
Write the formula of the following compound:
Magnesium carbonate
Write the formula of the following compound:
Zinc oxide
Write the formula of the following compound:
Aluminium oxide
Write the formula of the following compound:
Copper [II] oxide
Write the formula of the following compound:
Lead [II] chloride
Write the formula of the following compound:
Lead [II] nitrate
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
KCr2O7
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.
