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प्रश्न
On what basis is a chemical equation balanced?
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उत्तर
A chemical equation is balanced based on the law of conservation of mass; it states that "matter can neither be created nor be destroyed". If the number of atoms of various elements are different on the reactants' and products' side, it means they are either destroyed or created, which violates the law of conservation of mass.
संबंधित प्रश्न
Methyl orange is used as an indicator. It shows colour change in acid, base and neutral substance. Tabulate your result as follows:
| Indicator | Colour change | Inference |
| Methyl Orange | No change | ...................... |
| .................... | Acid | |
| Yellow | ....................... |
Translate the following statement into chemical equation and then balance it.
Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
Translate the following statement into chemical equation and then balance the equation:
Barium chloride reacts with zinc sulphate to give zinc chloride and barium sulphate.
Write complete balanced equation for the following reaction:
Calcium (solid) + water (liquid) 
Calcium Hydroxide (solution) + Hydrogen (gas)
Balance the following equation and add state symbols:
Zn + HCI → ZnCI2 + H2
What do you understand by endothermic reactions?
Is Respiration an endothermic reaction or an exothermic reaction?
One of the following is an exothermic reaction. This is:
(a) electrolysis of water
(b) conversion of limestone into quicklime
(c) process of respiration
(d) process of photosynthesis
Choose the correct answer from the options given below.
The formula of sodium carbonate is Na2CO3 and that of calcium hydrogen carbonate is
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate moles of salt formed.
1 g of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name and the color of the products formed in each case.
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Light energy
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
\[\ce{Na2SO3 + 2HCl ->[\triangle] 2NaCl + H2O + SO2}\]
Balance the following simple equation:
H2 + Cl2 → HCl
Balance the following simple equation:
Fe + H2O ⇌ Fe3O4 + H2
Balance the following simple equation:
Fe2O3 + H2 → Fe + H2O
Balance the following simple equation:
NaHCO3 + H2SO4 → Na2SO4 + H2O + CO2
Balance the following simple equation:
CaO + HCl → CaCl2 + H2O
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
2H2O + 2Cl2 → 2HCl + O2
Write the skeleton equation for the following word equation and then balance them.
- Carbon + Oxygen → Carbon dioxide.
- Phosphorus + Chlorine → Phosphorus pentachloride.
- Sulphur + Oxygen → Sulphur dioxide.
- Magnesium + hydrogen → Magnesium + Hydrogen chloride chloride.
