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Class 10 · Science · Medium
→Why can sodium hydroxide slowly form carbonate when left open in air?
Class 10 · Science · Easy
→Why is toothpaste generally made mildly basic?
Class 10 · Science · Medium
→Tooth decay damages enamel more when the pH falls below which approximate value?
Class 10 · Science · Easy
→An agricultural soil has become too acidic. Which substance is useful to improve it?
Class 10 · Science · Easy
→Why is the pH of pure water considered around seven?
Class 10 · Science · Easy
→If a solution has a very low pH value, which statement is correct about it?
Class 10 · Science · Easy
→Which pair contains two substances of basic nature?
Class 10 · Science · Easy
→Why does a turmeric stain become reddish-brown when soap is applied?
Class 10 · Science · Easy
→What change occurs when red litmus is added to a sodium hydroxide solution?
Class 10 · Science · Easy
→How does an antacid give relief during stomach irritation due to excess acidity?
Class 10 · Science · Easy
→A bee sting contains an acidic substance. Which substance is more suitable to reduce the pain?
Class 10 · Science · Easy
→When proper amounts of an acid and a base are mixed, which reaction mainly occurs?
Class 10 · Science · Medium
→Why does dry hydrogen chloride gas not turn dry blue litmus paper red?
Class 10 · Science · Medium
→In which condition will an acid show its acidic behavior most clearly?
Class 10 · Science · Medium
→How is the gas formed in the reaction between sodium carbonate and dilute hydrochloric acid identified?
Class 10 · Science · Medium
→A student added water to concentrated acid instead of adding concentrated acid to water. Why is this dangerous?
Class 10 · Science · Easy
→How is the acid present in lemon juice different from the acid present in curd?
Class 10 · Science · Easy
→If a solution turns red litmus blue and phenolphthalein pink, what is the nature of the solution?
Class 10 · Science · Medium
→When zinc metal reacts with dilute sulphuric acid, which test is most suitable to identify the evolved gas?
Class 10 · Science · Medium
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