Advertisements
Advertisements
Question
Correct the following statement:
Formula of iron (lll) oxide is FeO.
Advertisements
Solution
Formula of iron (lll) oxide is Fe2O3.
APPEARS IN
RELATED QUESTIONS
The radius of an oxygen atom is 0.073 nm. What does the symbol ‘nm’ represent ?
Explain the difference between 2N and N2.
What do the symbols, H2, S and O4 mean in the formula H2SO4 ?
The atomicities of ozone, sulphur, phosphorus and argon are respectively :
Complete the following statement by selecting the correct option :
The correct formula of aluminium oxide is
Fill in the blank:
Formula of iron (ill) carbonate is _____ .
Name the element in the compound and give the formula of the following compound:
Ethane
Write the formula of the following compound:
Sodium permanganate
Write the formula of the following compound:
Sodium plumbite
Write the formula of the following compound:
Sodium aluminate
Write the formula of the following compound:
Magnesium chloride
Write the formula of the following compound:
Magnesium nitrate
Write the formula of the following compound:
Zinc carbonate
Write the formula of the following compound:
Aluminium hydroxide
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.
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
Ca2(PO4)3
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
Write the steps that are followed to write down the chemical formula of a substance.
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.
