Advertisements
Advertisements
प्रश्न
Identify the following substance:
Gas B that has an offensive smell as of rotten eggs.
Advertisements
उत्तर
Hydrogen sulphide
APPEARS IN
संबंधित प्रश्न
Work out the formula for sulphur dioxide. (Valencies : S = 4 ; O = 2)
If the valency of carbon is 4 and that of sulphur is 2, work out the formula of the compound formed by the combination of carbon with sulphur. What is the name of this compound ?
Which of the following represents a correct chemical formula ?
Give the formula and valency of:
chromate ………….…….. .
Give the formula and valency of:
cupric ………………… .
Correct the following statement:
Formula of iron (lll) oxide is FeO.
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:
Green vitriol
Write the formula of the following compound:
Potassium sulphate
Write the formula of the following compound:
Potassium aluminate
Write the formula of the following compound:
Sodium permanganate
Write the formula of the following compound:
Sodium zincate
Write the formula of the following compound:
Sodium plumbite
Write the formula of the following compound:
Calcium chloride
Write the formula of the following compound:
Calcium sulphite
Write the formula of the following compound:
Zinc oxide
Write the formula of the following compound:
Aluminium chloride
Write the formula of the following compound:
Iron [III] chloride
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
NaZnO2
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.
