Advertisements
Advertisements
Question
Write the formula of the following compound:
Zinc hydroxide
Advertisements
Solution
Zinc hydroxide - Zn[OH]2 - `"Zn"^(2+)["OH"]^(1-)`
APPEARS IN
RELATED QUESTIONS
Write down the formula of aluminium chloride.
Explain the difference between 2N and N2.
An element Y has a valency of 4. Write the formula for its :
- chloride
- oxide
- sulphate
- carbonate
- nitrate
The formula of carbonate of a metal M is M2CO3.
What will be the formula of its iodide ?
The formula of carbonate of a metal M is M2CO3.
What will be the formula of its nitride ?
Identify the following substance:
Gas B that has an offensive smell as of rotten eggs.
Match the following:
| Column A | Column B |
| (a) Pb(NO3)2 | (i) rotten eggs smell |
| (b) CO2 | (ii) burns with a pop sound |
| (c) (NH4)2Cr2O7 | (iii) the suffocating smell of sulphur |
| (d) HCI | (iv) lime water turns milky |
| (e) NO2 | (v) crackling sound |
| (f) O2 | (vi) residue swells up |
| (g) H2 | (vii) brown gas |
| (i) H2S | (viii) supports combustion |
| (j) SO2 | (ix) fumes with NH3 solution |
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:
Acetic acid
Name the element in the compound and give the formula of the following compound:
Blue vitriol
Write the formula of the following compound:
Potassium nitrite
Write the formula of the following compound:
Sodium permanganate
Write the formula of the following compound:
Magnesium hydroxide
Write the formula of the following compound:
Aluminium chloride
Write the formula of the following compound:
Aluminium hydroxide
Write the formula of the following compound:
Iron [III] hydroxide
Write the formula of the following compound:
Silver [II] chloride
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.
