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 511-520 of 1900 questions.
A solution with pH less than which value is considered acidic?
A. सातSeven
pH tells whether a solution is acidic or basic.
A pH less than 7 indicates an acidic solution.
A pH of 7 indicates a neutral solution.
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What is the approximate pH value of pure water?
B. सातSeven
Pure water is neither acidic nor basic.
Its pH is approximately 7.
Treat pH 7 as the standard for neutrality.
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In which pH range is a solution considered basic?
C. सात से अधिकGreater than 7
The pH scale shows acidity and basicity.
A solution with pH greater than 7 is basic.
Higher pH means stronger basic nature.
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Tooth decay generally starts when the pH falls below which value?
C. पाँच दशमलव पाँच5.5
Acids can form in the mouth after eating.
Tooth enamel starts getting affected when pH falls below about 5.5.
Basic toothpaste helps reduce acidity.
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Why is acid rain more harmful than normal rain?
A. क्योंकि उसका पीएच कम होता हैBecause its pH is lower
Acid rain contains more acidic substances.
Its pH is lower than normal rain, making it more corrosive.
It can harm buildings, soil, and aquatic life.
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Which type of medicine is taken to reduce acidity during indigestion?
B. अम्लरोधीAntacid
Excess acid in the stomach can cause burning and indigestion.
An antacid is mildly basic and neutralises excess acid.
This is a daily-life example of neutralisation.
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Which substance is added to improve excessively acidic soil?
A. चूनाLime
Excessively acidic soil can harm plant growth.
Lime is basic and reduces acidity.
Remember different treatments for acidic and basic soils.
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Which substance can be added to improve excessively basic soil?
C. जैविक पदार्थOrganic matter
Highly basic soil is not suitable for many plants.
Organic matter can release acids slowly and reduce basicity.
Understand the reason behind soil treatment, not just the name.
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What is generally formed in a neutralisation reaction?
B. लवण और जलSalt and water
Neutralisation is a reaction between an acid and a base.
It generally forms salt and water.
Antacid action is a useful daily-life example.
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Which salt is formed when sodium hydroxide reacts with hydrochloric acid?
A. सोडियम क्लोराइडSodium chloride
Sodium hydroxide is a base and hydrochloric acid is an acid.
Their reaction forms sodium chloride and water.
The salt name comes from the ions of the acid and base.
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