Chemistry NCERT Exemplar Solutions Class 12th Chapter Four

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Incorrect order results from a balanced chemical equation. KClO₃ + 6FeSO₄ + 3H₂SO₄→KCl + 3H₂O + 3Fe₂ (SO₄)₃

This reaction is complex and occurs in several steps. The order is determined by the slowest in the reactions

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Simple reactions occur in a single stage, whereas complicated reactions occur in multiple steps. Each phase in a multi-step process has its own molecularity, which is not added together. There is no molecularity in complex reactions. The sequence of a complex reaction is decided by the slowest step. As a result, it can be used for both simple and complex processes

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The number of molecules of the reactants involved in an elementary reaction is referred to as the molecularity of the reaction. For this, a single molecule with a minimum molecularity of one is required, and it cannot be zero

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At room temperature, the redox titration of  KMnO₄vs oxalic acid is exceedingly slow; nevertheless, as the temperature rises, so does the rate of reaction. At a temperature of 500c., KMnO₄ is acidified with dil H₂SO₄ and interacts with oxalic acid.

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Thermodynamic feasibility is determined by ΔG factors. So, while the conversion of diamond to graphite is thermodynamically viable, the reaction is sluggish and has a high activation energy.

Gibb's free energy is ΔG
ΔG =Rtlnk

ΔG_{P, T $>$}  o

at constant pressure and temperature should be negative or less than 0.

For example, Diamond to be converted to Graphite

ΔG=−ve

It is theoretically conceivable, but the rate is extremely slow, and the activation energy is extremely high. The energy required to transform diamond to graphite is insufficient.

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The pace of any reaction is determined by the concentration of the reactants, the rate of any reaction generally declines during the reaction. As the reaction progresses, the reactant concentration declines, and the product concentration rises.

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The chance of more than three molecules meeting at the same time is extremely minimal, reactions with molecularity more than three are extremely rare. Simultaneous collisions decrease as the number grows, the probability is very low, and more than three reactions with molecularity are uncommon.

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The activation energy for fuel combustion reactions is very large, and because every substance or element requires an ignition temperature to function and excite to a higher temperature, oxygen in air does not combust to fire.

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The energy possessed by the reacting species increases as the temperature rises, the pace of a reaction increases. This raises the temperature and raises the average kinetic energy of the reactant molecules

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The reaction's activation energy is relatively high at room temperature and not readily available, the reaction is highly viable. H₂ (g) and O₂ (g)bond break and clash, allowing particles to pass across the energy barrier.

2H₂ + O₂→2H₂O

Because of the large activation energy, the water molecule does not form in this equation.