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प्रश्न
The chemical equations are balanced to satisfy one of the following laws in chemical reactions. This law is known as:
विकल्प
law of conservation of momentum.
law of conservation of mass.
law of conservation of motion.
law of conservation of magnetism.
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उत्तर
Law of conservation of mass
Explanation:
The law of conservation of mass states that matter can neither be created nor destroyed during a chemical reaction. Consequently, the total mass of the reactants must exactly equal the total mass of the products. To obey this law, we balance chemical equations, ensuring that the exact number of atoms of each element is identical on both sides of the reaction.
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संबंधित प्रश्न
Aluminium burns in chlorine to form aluminium chloride (AlCl3). Write a balanced chemical equation for this reaction.
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\[\ce{KClO3 -> KCl + O2}\]
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CH2 + H5OH `("Hot Conc." H_2SO_4)/`>
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Zn + KOH → K2ZnO2 + H2
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| 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 |
Representation of the results of a chemical change – is a chemical equation.
For the equation: FeCl3 + 3NH4OH 3NH4Cl + Fe(OH)3 ↓
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Is the equation given above a balanced equation. Give reasons.
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\[\ce{Ca(OH)2 + HNO3 -> Ca(NO3)2 + H2O}\]
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Iron + Hydrochloric acid → Iron [II] chloride + Hydrogen
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Fe2O3 + 2H2 → 2Fe + 3H2O
Which of the following is not a physical change?
Give the characteristic tests for the following gases :
- CO2
- SO2
- O2
- H2
