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प्रश्न
An element Y has a valency of 4. Write the formula for its :
- chloride
- oxide
- sulphate
- carbonate
- nitrate
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उत्तर
Formula for the listed compounds are as follows:
- Crossing the valencies, chloride for the element Y will have the chemical formula YCl4.
- Crossing over the valencies, oxide for the element Y will have the chemical formula YO2.
- Crossing the valencies, sulphate for the element Y will have the chemical formula Y(SO4)2.
- Crossing the valencies, carbonate for the element Y will have the chemical formula Y(CO3)2.
- Crossing the valencies, nitrate for the element Y will have the chemical formula Y(NO3)4.
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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.
