Practice focused topic-wise MCQs with answers and explanations for quick revision and exam preparation.
Difficulty select karke sirf is topic ke focused MCQs practice karein. Score, timer aur explanations student-friendly flow me milenge.
Showing 601-610 of 1900 questions.
A. सात के पासTowards 7
A solution with pH 4 is acidic.
Adding water dilutes the acid and decreases its acidity.
On dilution, the pH of an acidic solution moves towards 7 but usually does not become greater than 7.
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A basic solution has pH 12. What happens to its pH when water is added?
B. पीएच सात के पास घटेगाpH will decrease towards 7
A solution with pH 12 is basic.
Adding water dilutes the base and decreases its basicity.
On dilution, the pH of a basic solution moves towards 7.
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A. पीएच पाँच वाला विलयनSolution with pH 5
Among the given values, only pH 5 is acidic.
Tooth enamel can be affected when pH falls below about 5.5.
Among acidic substances, lower pH means greater chance of damage.
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B. विलयन अम्लीय हैThe solution is acidic
Blue litmus turning red shows acidic nature.
Phenolphthalein remains colourless in acidic solution.
Both observations together confirm that the solution is acidic.
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C. क्षारीयBasic
Red litmus turning blue indicates basic nature.
Phenolphthalein becomes pink in a basic solution.
In such questions, combine both indicator observations before choosing the answer.
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In which reaction is a gas most likely to form that turns lime water milky?
B. सोडियम कार्बोनेट और तनु अम्लSodium carbonate and dilute acid
The gas that turns lime water milky is carbon dioxide.
Metal carbonates react with acids to produce carbon dioxide.
Therefore, sodium carbonate and dilute acid is the correct pair.
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C. हाइड्रोजनHydrogen
Metals generally react with acids to release hydrogen gas.
Hydrogen gives a pop sound near a burning splint.
This is an important gas identification test.
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Why does copper generally not produce hydrogen gas with dilute hydrochloric acid?
A. क्योंकि ताँबा हाइड्रोजन से कम क्रियाशील हैBecause copper is less reactive than hydrogen
A metal displaces hydrogen from an acid only if it is more reactive than hydrogen.
Copper is less reactive than hydrogen.
Therefore, copper generally does not release hydrogen from dilute hydrochloric acid.
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Which salt is formed by complete neutralisation of sodium hydroxide and sulphuric acid?
B. सोडियम सल्फेटSodium sulphate
Sulphuric acid forms sulphate salts.
Sodium hydroxide provides sodium ions.
Therefore, the salt formed is sodium sulphate.
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Which salt is formed when calcium hydroxide reacts with hydrochloric acid?
A. कैल्शियम क्लोराइडCalcium chloride
Calcium hydroxide is a base and hydrochloric acid is an acid.
Calcium ions and chloride ions combine to form calcium chloride.
Neutralisation forms salt and water.
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