Advertisements
Advertisements
Question
Write the formula of the following compound:
Sodium dichromate
Solution
Sodium dichromate - Na2Cr2O7 - `"Na"^(1+)["Cr"_2"O"_7]^(2-)`
APPEARS IN
RELATED QUESTIONS
What is the difference between 2H and H2 ?
What is the significance of the formula of a substance ?
Write down the formulae for the following compounds :
Calcium oxide
If the valency of hydrogen is 1 and that of nitrogen is 3, work out the formula for ammonia.
(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 carbonate of a metal M is M2CO3.
What will be the formula of its phosphate ?
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 dichromate
Write the formula of the following compound:
Sodium bisulphite
Write the formula of the following compound:
Calcium nitrate
Write the formula of the following compound:
Calcium hydroxide
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:
Zinc oxide
Write the formula of the following compound:
Zinc oxide
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.
BaCl2
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-`
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.
