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प्रश्न
What are the ways by which a chemical equation can be made more informative ?
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उत्तर
A chemical equation can give more information in the following ways:
- The physical state of the reactants and products can be indicated by putting (s) for solid, (l) for liquid, (g) for gas and (aq) for aqueous state.
- Evolution or absorption of heat during the reaction can be denoted by adding or subtracting a heat term on the product side.
- Temperature, pressure and catalyst can be indicated above the arrow (→ or =) separating the reactants and products.
- Concentration of reactants and products is indicated by adding word (dil) for dilute and (conc) for concentrated before their formulae.
- By the sign \[\ce{-> or <=>}\] information about irreversible and reversible reactions can be obtained.
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संबंधित प्रश्न
Write balanced chemical equations for the following word equation:
Magnesium + dil sulphuric acid → Magnesium sulphate + water
Balance the following equation:
\[\ce{Pb3O4->PbO + O2}\]
Balance the following equation:
\[\ce{Pb3O4 + HCl->PbCl2 + H2O + Cl2}\]
Balance the following important equation:
Fe + HCl → FeCl2 + H2
Balance the following important equation:
\[\ce{NH4Cl + Ca(OH)2 → CaCl2 + H2O + NH3}\]
Balance the following important equation:
Mg3N2 + H2O → Mg(OH)2 + NH3
Balance the following important equation:
NH3 + O2 → NO + H2O (catalytic oxidation of NH3)
Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.
- Iron (III) oxide reacts with aluminum and gives molten iron and aluminum oxide.
- Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.
- Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.
- Ethanol is burnt in air to form carbon dioxide, water and releases heat.
Which among the following change is exothermic or endothermic in nature?
Decomposition of ferrous sulphate
Balance the following equation.
\[\ce{Calcium chloride + Sulphuric acid -> Calcium sulphate + Hydrogen chloride}\]
