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۔
log[H⁺]
−log[H⁺]
1/[H⁺]
[H⁺]²
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Explanation
pH = –log [H⁺]
It measures the acidity or alkalinity of a solution based on the hydrogen ion concentration.
The pH scale ranges from 1 to 14 , with:
1-6 being acidic 7 being neutral (neither acidic nor basic) 8-14 being basic (alkaline)
پانی کا کنجوجٹ ایسڈ ______ ہے؟
H₂O
H₃O⁺
OH⁻
None of these
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Explanation
The conjugate acid of water (H₂O) is H₃O⁺ (hydronium ion).
When water acts as a base, it accepts a proton (H⁺) and forms H₃O⁺ .
Salt
Water
Salt + Water
None
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Explanation
When an acid reacts with a base, it forms a salt and water.
This type of reaction is called a n eutralization reaction
کسی بھی کیمیائی تبدیلی کے لئے توازن مستقل کی عددی قدر ______ کو تبدیل کرنے سے متاثر ہوتی ہے؟
Concentration of the products
Concentration of reacting substances
Temperature
None of these
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Explanation
The equilibrium constant (K) depends on temperature as per the Van't Hoff equation. Changing concentration does not affect K, but shifts the equilibrium position.
ایک ردعمل کے لئے 1 کا ایک مساوات کا مطلب یہ ہے کہ ردعمل _______ ہے؟
Not very favourable and will not form very much product
Very favourable and proceeds to mostly products with very little reactions left over
One that will yield 50% products and 50% reactants left over
None of these
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Explanation
Equilibrium constant (K = 1) means equal concentrations of reactants and products at equilibrium. The reaction does not favor either side, leading to 50% reactants and 50% products.
Reactants
Products
Catalyst
Equilibrium
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Explanation
If the equilibrium constant (K) is greater than 1 (K > 1), the reaction favors the products.
This means that at equilibrium, the concentration of products will be higher than the concentration of reactants.
Conversely, if K < 1, the reaction favors the reactants.
Atomic structure
Increase in pressure
Equilibrium shift due to changes
Bond angle
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Explanation
Le Chatelier's principle states that if a system at equilibrium is disturbed by a change in conditions (like temperature, pressure, or concentration),
The system will shift to counteract the change and re-establish equilibrium.
وہ اصول جو یہ بتاتا ہے کہ اگر کسی نظام پر توازن میں تناؤ کا اطلاق ہوتا ہے تو نظام جہاں تک ممکن ہو تناؤ کے اثر کو ختم کر دیتا ہے؟
Haber's
Boyle's
Charles
Le-Chatelier
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Explanation
The principle that states that if a stress is applied to a system at equilibrium, the system will nullify the effect of the stress as far as possible is known as Le Chatelier's principle.
This principle helps predict how a change in conditions (like concentration, temperature, or pressure ) will affect the position of equilibrium in a chemical reaction.
لی چیٹیلیئر کے اصول میں کہا گیا ہے کہ جب توازن میں کسی نظام پر تناؤ کا اطلاق ہوتا ہے تو ، نظام ______ تناؤ کا اظہار کرے گا۔
Adjust to increase
Adjust to reduce
Always increase
None of these
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Explanation
Le Chatelier’s principle states that a system at equilibrium counteracts applied stress. It shifts in a direction that minimizes the disturbance, restoring balance.
Equilibrium position
Yield of products
Temperature
Rate of reaction only
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Explanation
A catalyst affects the rate of reaction only.
A catalyst speeds up the rate of a reaction by lowering the activation energy required,
But it does not change the equilibrium position or the yield of products.
