NAVY CIVILIAN ALL JOBS PAST PAPERS YEAR 2025
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
مندرجہ ذیل میں سے کون سا عوامل توازن کو متاثر نہیں کرتا ہے؟
Temperature
Catalyst
Pressure
None of these
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Explanation
A catalyst speeds up the rate of reaction but does not affect the position of equilibrium.
Temperature, pressure, and concentration can shift the equilibrium position of a reversible reaction.
مندرجہ ذیل میں سے کون سے کیمیائی رد عمل کی شرح میں اضافہ ہوتا ہے؟
Catalyst
Inhibitor
Reactant
None of these
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Explanation
A catalyst is a substance that speeds up a chemical reaction without being consumed or altered.
Catalysts increase the rate of reaction by lowering the activation energy required for the reaction to occur .
Δtime / Δconcentration
Δpressure / Δvolume
Δconcentration / Δtime
Δvolume / Δtime
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Explanation
The rate of a reaction is defined as the change in concentration of a reactant or product per unit of time.
Rate of reaction:
Measures how fast a reaction proceeds, indicating how quickly reactants are consumed and products are formed.
Change in concentration (Δconcentration):
Refers to the difference in concentration of a substance (reactant or product) between two points in time.
Change in time (Δtime):
Represents the time interval over which the concentration change occurs.
Δconcentration / Δtime:
This formula calculates the rate of reaction. A positive value indicates product formation, while a negative value indicates reactant consumption.
Temperature
Catalyst
Pressure
Order of reaction
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Explanation
The unit of a rate constant is derived from the rate law equation, which relates the rate of a reaction to the concentrations of the reactants raised to their respective orders.
Maximum energy required
Minimum energy needed
Energy of products
Bond energy
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Explanation
Activation energy represents the energy barrier that reactants must overcome to transition into products, and it's the minimum amount of energy required for this to happen.
Loss of electrons
Gaining neutrons
Gain of electrons
Donating protons
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Explanation
Reduction:
Gain electrons Oxidation state lowers Always paired with oxidation (redox) Oxidizing agent gets reduced Additional information
Oxidation is the chemical process of:
Losing electrons Oxidation state increases Always paired with reduction (together form redox) Reducing agent gets oxidized (it gives up the electrons)
Gain of electrons
Loss of electrons
Accepting protons
Donating neutrons
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Explanation
Oxidation is a chemical process where an atom, molecule, or ion loses electrons, increasing in its oxidation state.
k, Ea, T
m, v, r
a, b, c
H, S, G
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Explanation
The Arrhenius equation relates the rate constant (k), activation energy (Ea), and absolute temperature (T).
The equation is written as k = A * e^(-Ea/RT), where A is the frequency factor and R is the ideal gas constant
Donates electrons
Accepts electrons
Gains protons
Releases energy
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Explanation
An oxidizing agent accepts electrons.
In a redox reaction, an oxidizing agent "oxidizes" another substance by causing it to lose electrons,
Meaning the oxidizing agent itself gains electrons.
Covalent compounds
Acids
Ionic compounds
Noble gases
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Explanation
Electrolysis works by passing an electric current through a molten or aqueous ionic compound, causing it to break down into its constituent elements.