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प्रश्न
What is the difference between 2H and H2 ?
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उत्तर
H2 is the chemical formula of hydrogen gas. It denotes that two atoms of hydrogen chemically bond to give a molecule of hydrogen gas.
2H denotes the presence of two atoms of hydrogen, which are not chemically bonded.
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संबंधित प्रश्न
Name the following compounds. Also write the symbols/formulae of the ions present in them :
- CuSO4
- (NH4)2SO4
- Na2O
- Na2CO3
- CaCl2
(a) Write the symbols/formulae of two simple ions and two compound ions (or polyatomic ions).
Complete the following statement by selecting the correct option :
The correct formula of aluminium oxide is
Correct the following statement:
Formula of iron (lll) oxide is FeO.
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 bisulphite
Write the formula of the following compound:
Aluminium hydroxide
Write the formula of the following compound:
Lead [II] nitrate
Write the formula of the following compound:
Lead [II] sulphate
Write the molecular formulae for the following compounds
Iron (III) sulphide
