Advertisements
Advertisements
प्रश्न
Write the formula of the following compound:
Calcium bisulphite
Advertisements
उत्तर
Calcium bisulphite - Ca[HSO3]2 - `"Ca"^(2+)["HSO"_3]^(1-)`
APPEARS IN
संबंधित प्रश्न
Write down the formulae of sodium sulphide.
Write the chemical formula of the Magnesium chloride.
Explain the difference between 2N and N2.
If the valency of hydrogen is 1 and that of nitrogen is 3, work out the formula for ammonia.
Give the empirical formula of Glucose C6H12O6 .
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 |
Name the element in the compound and give the formula of the following compound:
Ethanol
Write the formula of the following compound:
Potassium bicarbonate
Write the formula of the following compound:
Calcium carbonate
Write the formula of the following compound:
Zinc carbonate
Write the formula of the following compound:
Zinc oxide
Write the formula of the following compound:
Iron [II] chloride
Write the formula of the following compound:
Silver [I] chloride
Write the formula of the following compound:
Silver [II] chloride
Define the term Relative molecular mass. State why indirect methods are utilised to determine the absolute mass of an atom. Explain in brief the indirect method used.
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
BaCl2
Write the molecular formulae for the following compounds
Aluminium (III) nitrate
Write the steps that are followed to write down the chemical formula of a substance.
Play a game for writing formula.
Example 1: Make placards with symbols and valencies of the elements separately. Each student should hold two placards, one with the symbol in the right hand and the other with the valency in the left hand. Keeping the symbols in place, students should criss-cross their valencies to form the formula of a compound.
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.
