Advertisements
Advertisements
प्रश्न
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
Ca2(PO4)3
Advertisements
उत्तर
Ca2(PO4)3
Correct formula – Ca3(PO4)2
APPEARS IN
संबंधित प्रश्न
Name the elements water is made of. What are the valencies of these elements ? Work out the chemical
formula for water.
Give the formula and valency of:
cupric ………………… .
Complete the following statement by selecting the correct option :
The correct formula of aluminium oxide is
Fill in the blank:
Formula of iron (ill) carbonate is _____ .
Give the empirical formula of Glucose C6H12O6 .
Identify the following substance:
A brown gas D with the irritating smell.
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 |
Write the formula of the following compound:
Potassium zincate
Write the formula of the following compound:
Calcium sulphate
Write the formula of the following compound:
Magnesium sulphate
Write the formula of the following compound:
Magnesium bicarbonate
Write the formula of the following compound:
Zinc oxide
Write the formula of the following compound:
Aluminium oxide
Write the formula of the following compound:
Copper [I] oxide
Write the formula of the following compound:
Iron [II] sulphate
Write the formula of the following compound:
Lead [II] sulphate
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
NaClO
Which of the following represents a correct chemical formula? Name it.
Write the molecular formulae for the following compounds
Mercury (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.
