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प्रश्न
Identify the following substance:
Gas B that has an offensive smell as of rotten eggs.
उत्तर
Hydrogen sulphide
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संबंधित प्रश्न
What is meant by the term chemical formula?
An element Z has a valency of 3. What is the formula of oxide of Z ?
An element X has a valency of 4 whereas another element Y has a valency of 1. What will be the formula of the compound formed between X and Y ?
(a) Write the symbols/formulae of two simple ions and two compound ions (or polyatomic ions).
Define ‘formula unit’ of an ionic compound. What is the formula unit of (i) sodium chloride, and
(ii) magnesium chloride ?
Give the formula and valency of:
cupric ………………… .
Give the empirical formula of Acetylene C2H2
What is a chemical formula? What is the significance of a formula?give an example to illustrate?
Name the element in the compound and give the formula of the following compound:
Carbonic acid
Name the element in the compound and give the formula of the following compound:
Ethanol
Write the formula of the following compound:
Potassium bisulphite
Write the formula of the following compound:
Aluminium nitrate
Write the formula of the following compound:
Copper [I] sulphide
Write the formula of the following compound:
Iron [II] hydroxide
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
BaCl2
What do you understand by chemical formula of a compound? What is its significance?
Write the molecular formulae for the following compounds
Aluminium (III) nitrate
Write the molecular formulae for the following compounds
Iron (III) sulphide
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.
