Chemistry
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New answer posted
a year agoContributor-Level 10
This is a Short Answer Type Question as classified in NCERT Exemplar
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
ΔGP, 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.
New answer posted
a year agoContributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Correct Option: (iii)
(i) The properties which don't depend on the mass of species are termed intensive properties. ECell is an intensive property that doesn't depend on the mass of the species.? rG is an extensive property as it depends on the mass of the species. Therefore, this option is incorrect
(ii) ECell is an intensive property but? rG is an extensive property so this option is incorrect
(iii) The properties which don't depend on the mass of species are termed intensive properties ECell is an intensive property that doesn't depend on the mass of the species
New answer posted
a year ago
Contributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
New answer posted
a year agoContributor-Level 10
This is a Short Answer Type Question as classified in NCERT Exemplar
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.
New answer posted
a year agoContributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Correct Option: (iii)
(i) For measurement of electrode potential standard conditions must be met which is 1 bar pressure and 1M concentration which is not here so this option is incorrect.
(ii) For measurement of electrodes potential standard conditions must be met which is 1 bar pressure and 1M concentration which is not here so this option is incorrect.
(iii) When copper electrode is connected to SHE it acts as cathode and its standard electrode potential can be measured as follows
E E R- E L
For calculationn of standard potential of a given cell it shoul
New answer posted
a year agoContributor-Level 10
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: Acetic acid is a weak electrolyte and the number of ions on dilution increases due to an increase in the degree of dissociation. In the case of strong electrolytes the number of ions remains the same but interionic attraction decreases.
New answer posted
a year agoContributor-Level 10
Xenon form compounds due to the high electronegativity of fluorine and oxygen, low ionization energy compared to lighter noble gases, and the availability of empty d-orbitals. This breaks the old assumption about noble gases being entirely inert.
New answer posted
a year agoContributor-Level 10
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: The cell reaction of a lead storage battery is as follows;
Pb + PbO2 + 2H2SO4→2H2SO4 + 2H2O
The density of electrolytes changes because water is formed and sulphuric acid is consumed as a product during discharge of the battery
New answer posted
a year agoContributor-Level 10
This is a Short Answer Type Question as classified in NCERT Exemplar
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.
New answer posted
a year agoContributor-Level 10
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: Primary batteries contain a limited amount of reactants and once consumed are discharged. Secondary batteries take a long time to recharge. Fuel cells run continuously as long as reactants are supplied to them and products are consumed
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