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प्रश्न
Correct the following statement:
Molecular formula of water is H2O2
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उत्तर
Molecular formula of water is H2O.
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संबंधित प्रश्न
What do the following abbreviations stand for ?
- O
- 2O
- O2
- 3O2
An element B shows valencies of 4 and 6. Write the formulae of its two oxides.
The formula of a compound is X3Y. The valencies of elements X and Y will be respectively :
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:
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Sodium chloride
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Sodium aluminate
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Sodium iodide
Write the formula of the following compound:
Zinc chloride
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Aluminium carbonate
Write the formula of the following compound:
Lead [II] nitrate
Define the term Relative atomic 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.
KCr2O7
Write the molecular formulae for the following compounds
Calcium (II) phosphate
Derive the chemical formula for calcium chloride.
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.
