CHEMISTRY CLASS 10TH MCQS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
کے سی کی قدر اس وقت بڑھتی ہے جب ______؟
[Product] is less
[Product] is more
[Reactant] is more
[Reactant = product]
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Explanation
Important: Simply adding more product does not permanently increase Kc; it changes the reaction quotient until equilibrium is restored.
Kc is the equilibrium constant. A larger Kc generally indicates equilibrium favors products. At equilibrium, the value of Kc depends on temperature. A catalyst does not change Kc.
کیو سی کو _____ کے طور پر بیان کیا جا سکتا ہے؟
Ratio of product and reactants
Ratio of molar concentration of product and reactant at specific time
Ratio of molar concentration of product and molar volume of reactant
Ratio of molar concentration of product and reactant raised to the power of coefficient
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Explanation
Qc (reaction quotient) is defined as the ratio of the molar concentrations of products to reactants, each raised to the power of their respective stoichiometric coefficients (coefficients in the balanced chemical equation).
نظام توازن میں مستحکم ہے جب ______؟
Qc = Kc
Qc > Kc
Qc < K
None of these
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Explanation
When the reaction quotient (Qc) is equal to the equilibrium constant (Kc), the system is at equilibrium and is stable.
Qc = Kc indicates that the rates of forward and reverse reactions are equal, and the concentrations of reactants and products remain constant.
جس نظام کے لیے توازن مستقل ہے، کے سی میں ارتکاز کی اکائیاں ہیں۔
N2(g) + 3H2(g) ⇌ 2NH3(g)
N2(g) + 02(g) ⇌ 2NO
H2(g) +12(g) ⇌ 2HI(g)
CO2(g) + H3(g) ⇌ CO + H2O(l)
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Explanation
The equilibrium constant, Kc, has units of concentration for the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g)
This reaction involves a change in the number of moles of gas on both the reactant and product sides, specifically:
4 moles (reactants) ⇌ 2 moles (products)
جب کے سی کی شدت چھوٹی ہے تو ______ کی طرف اشارہ کرتا ہے؟
Reaction mixture contain most of the reactant
Reaction mixture contain most of the product
Reaction mixture contain almost equal amount of reactant and product
Reaction goes to completion
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Explanation
Kc is the equilibrium constan t based on concentration. A small Kc means equilibrium favors the reactants. Therefore, more reactants remain at equilibrium. Only a small amount of products is formed. A large Kc indicates that equilibrium favors the products.
ایک ردعمل جو کبھی مکمل نہیں ہوتا ہے اسے ریورسبل ردعمل کہا جاتا ہے۔ الٹ جانے والا ردعمل ______ سے ظاہر ہوتا ہے؟
Doted lines
Single arrow
Double arrow
Double straight line
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Explanation
A reversible reaction is a reaction that can proceed in both the forward and reverse directions, and never goes to completion.
It is represented by a double arrow (⇌) between the reactants and products.
For example: A + B ⇌ C + D
Key Point:
Single arrow (→) : Represents an irreversible reaction, where the reaction only proceeds in one direction.
مندرجہ ذیل میں سے کون سا بیان متحرک توازن کے بارے میں غلط ہے؟
It takes place in a close container
Concentration of reactant and products are not changed
Rate of forward reaction is equal to rate of reverse reaction
Equilibrium cannot be disturbed by any external stress
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Explanation
Dynamic equilibrium is a state where the rates of forward and reverse reactions are equal, and the concentrations of reactants and products remain constant.
However, this equilibrium can be disturbed by external stresses such as:
Changes in concentration Changes in temperature Changes in pressure Adding or removing reactants or products
