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प्रश्न
What is a balanced chemical equation? Why should a chemical equation be balanced?
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उत्तर
The chemical equation in which the number of atoms of each element on both sides is equal is called the balanced equation. A chemical equation should be balanced because there is no loss or gain of any matter during a chemical reaction, i.e., the law of conservation of matter must hold good for the reaction.
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संबंधित प्रश्न
Write the balanced chemical equation for the following reaction.
\[\ce{Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water}\]
Translate the following statement into a chemical equation and then balance the equation:
Carbon disulphide burns in air to give carbon dioxide and sulphur dioxide.
Correct and balance the following equation:
\[\ce{Ca + H2O -> CaOH + H}\]
Balance the following chemical equation:
\[\ce{C + CO2 -> CO}\]
Balance the following equation and add state symbols:
\[\ce{Zn + HCl -> ZnCl2 + H2}\]
Write a balanced chemical equation with state symbols for the following reaction:
Barium chloride solution reacts with sodium sulphate solution to give insoluble barium sulphate and a solution of sodium chloride.
Explain the following reaction with one suitable example .
Decomposition reaction
Balance the following chemical equation :
Na2CO3 + HCl → NaCI + H2O + CO2
Balance the following equation. Also name the products formed.
`"Mg" + "O"_2 → "MgO"`
Balance the following equation:
MnO2 + HCl → MnCl2 + H2O + Cl2
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate the mass of chlorine gas formed.
Match column A with column B.
| Column A | Column B |
| (a) Blue salt changes to white and then black | (i) Ammonium dichromate |
| (b) Orange coloured compound changes to green. | (ii) Iodine |
| (c) Red compound changes to brown and then yellow. | (iii) Zinc Nitrate |
| (d) White to yellow when hot and white when cold. | (iv) Copper sulphate |
| (e) Violet solid changes to violet vapours. | (v) Red Lead |
In certain reaction a change of state is observed i.e. solid to liquid, liquid to gas etc. – State the change of state of the products – to give the respective reactant.
\[\ce{C +2S -> CS2}\]
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:
K + H2O → KOH + H2
Balance the following simple equation:
Fe + H2O ⇌ Fe3O4 + H2
Balance the following simple equation:
KBr + Cl2 → KCl + Br2
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
NaOH + CO2 → Na2CO3 + H2O
Balance the given chemical reaction as per the instructions below.
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Write names of reactants and products of chemical reaction.
