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प्रश्न
Correct the following statement:
A molecular formula represents an element.
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संबंधित प्रश्न
What is meant by the symbol of an element ? Explain with examples.
If the valency of carbon is 4 and that of sulphur is 2, work out the formula of the compound formed by the combination of carbon with sulphur. What is the name of this compound ?
Define ‘formula unit’ of an ionic compound. What is the formula unit of (i) sodium chloride, and
(ii) magnesium chloride ?
The formula of carbonate of a metal M is M2CO3.
What will be the formula of its nitride ?
Complete the following statement by selecting the correct option :
The correct formula of aluminium oxide is
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 |
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Write the formula of the following compound:
Sodium sulphate
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Write the formula of the following compound:
Tetra amine copper [II] sulphate
Write the formula of the following compound:
Iron [II] chloride
Write the formula of the following compound:
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Write the formula of the following compound:
Lead [II] oxide
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
NaCO3
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
Ca2(PO4)3
Write the molecular formulae for the following compounds
Iron (III) sulphide
