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प्रश्न
Why do we need to balance chemical equations?
उत्तर
A chemical equation needs to be balanced so as to make the number of the atoms of the reactants equal to the number of the atoms of the products.
संबंधित प्रश्न
Balance the given equation:
HNO3 + Ca(OH)2 
Ca(NO3)2 + H2O
When potassium nitrate is heated, it decomposes into potassium nitrite and oxygen. Write a balanced equation for this reaction and add the state symbols of the reactants and products.
Give one example of an exothermic reaction.
The chemical reaction between two substances is characterised by a change in colour from orange to green. These two substances are most likely to be:
(a) potassium dichromate solution and sulphur dioxide
(b) potassium permanganate solution and sulphur dioxide
(c) potassium permanganate solution and lemon juice
(d) potassium dichromate solution and carbon dioxide.
Which of the following is not an endothermic reaction?
(a) CaCO3 → CaO + CO2
(b) 2H2O →2H2 + O2
(c) 6CO2 + 6H2O → C6H12O6 + 6O2
(d) C6H12O6 + 6O2 → 6CO2 + 6H2O
Write word equation for the following skeletal equation:
\[\ce{AgBr -> Ag + Br2}\]
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Light energy
Balance the following simple equation:
ZnS + O2 → ZnO + SO2
Balance the following simple equation:
CaO + HCl → CaCl2 + H2O
Give the characteristic tests for the following gases :
- CO2
- SO2
- O2
- H2
