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प्रश्न
Name the element in the compound and give the formula of the following compound:
Acetic acid
उत्तर
| Element | Element in compound | Formula |
| Acetic acid | C, H, O Carbon, Hydrogen, oxygen |
CH3COOH |
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संबंधित प्रश्न
What is meant by the term chemical formula?
Write the chemical formula of the Magnesium chloride.
Write the chemical formula of the Calcium oxide.
Write the chemical formula of the Copper nitrate.
An element Y has a valency of 4. Write the formula for its :
- chloride
- oxide
- sulphate
- carbonate
- nitrate
Correct the following statement:
Molecular formula of water is H2O2
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:
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:
Sodium hydroxide
Write the formula of the following compound:
Calcium chloride
Write the formula of the following compound:
Magnesium chloride
Write the formula of the following compound:
Zinc carbonate
Write the formula of the following compound:
Iron [II] oxide
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.
Write the chemical formula for the following compounds
- Aluminium sulphate
- Silver nitrate
- Magnesium oxide
- Barium chloride
Give the chemical formulae for the following compounds and compute the ratio by mass of the combining elements in each one of them. (You may use appendix-III).
- Ammonia
- Carbon monoxide
- (Hydrogen chloride
- Aluminium fluoride
- Magnesium sulphide
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.
