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प्रश्न
Identify the following substance:
Gas C that is colourless and can be used as a bleaching agent.
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उत्तर
Sulphur dioxide
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संबंधित प्रश्न
Write down the formulae of magnesium hydroxide.
Write the chemical formula of the Magnesium chloride.
What do the following abbreviations stand for ?
- O
- 2O
- O2
- 3O2
Write down the formulae for the following compounds :
Magnesium hydroxide
An element X of valency 3 combines with another element Y of valency 2. What will be the formula of the compound formed ?
An element Y has a valency of 4. Write the formula for its :
- chloride
- oxide
- sulphate
- carbonate
- nitrate
An element A forms an oxide A2O5.
What will be the formula of chloride of A ?
Give the formula and valency of:
cupric ………………… .
Correct the following statement:
Molecular formula of water is H2O2
The formula of the nitride of a metal X is XN, state the formula of its hydroxide.
Name the element in the compound and give the formula of the following compound:
Ethanol
Write the formula of the following compound:
Potassium plumbite
Write the formula of the following compound:
Magnesium chloride
Write the formula of the following compound:
Aluminium hydroxide
Write the formula of the following compound:
Copper [II] oxide
Write the formula of the following compound:
Iron [II] sulphate
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
KCr2O7
Write the chemical formula for the following elements.
- Hydrogen
- Nitrogen
- Ozone
- Sulphur
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.
