Advertisements
Advertisements
प्रश्न
Write the formula of the following compound:
Calcium carbonate
Advertisements
उत्तर
Calcium carbonate - CaCO3 - `"CO"_3^(2-)`
APPEARS IN
संबंधित प्रश्न
Write down the formula of aluminium chloride.
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
Give the formula and valency of:
aluminium ………………. .
Give the empirical formula of Glucose C6H12O6 .
Identify the following substance:
An alkaline gas A which gives dense white fumes with hydrogen chloride.
Identify the following substance:
Gas C that is colourless and can be used as a bleaching agent.
Name the element in the compound and give the formula of the following compound:
Blue vitriol
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 carbonate
Write the formula of the following compound:
Magnesium carbonate
Write the formula of the following compound:
Zinc chloride
Write the formula of the following compound:
Zinc carbonate
Write the formula of the following compound:
Iron [II] oxide
Write the formula of the following compound:
Lead [II] sulphate
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
NaZnO2
Write the molecular formulae for the following compounds
Copper (II) bromide
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 1: Make placards with symbols and valencies of the elements separately. Each student should hold two placards, one with the symbol in the right hand and the other with the valency in the left hand. Keeping the symbols in place, students should criss-cross their valencies to form the formula of a compound.
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.
