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प्रश्न
Fill the following blanks with suitable words :
In a chemical reaction, the sum of the masses of the reactants and the products remains unchanged. This is called ....................
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उत्तर
In a chemical reaction, the sum of masses of the reactants and their products remain unchanged. This is called the law of conservation of mass.
संबंधित प्रश्न
Write down the formulae of sodium oxide.
The atomicities of ozone, sulphur, phosphorus and argon are respectively :
An element X of valency 3 combines with another element Y of valency 2. What will be the formula of the compound formed ?
Give the empirical formula of : Benzene C6H6
Write the formula of the following compound:
Potassium aluminate
Write the formula of the following compound:
Calcium chloride
Write the formula of the following compound:
Magnesium bicarbonate
Write the formula of the following compound:
Aluminium hydroxide
Write the molecular formulae for the following compounds
Magnesium (II) acetate
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.
