CBSE Class-10 Science: Questions 54 - 63 of 117

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Question number: 54

» Acids, Bases and Salts » How Strong Are Acid or Base Solutions? » pH Scale

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Write a note on natural and synthetic indicators?

Question number: 55

» Acids, Bases and Salts » How Strong Are Acid or Base Solutions? » pH Scale

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X is a soluble acidic oxide and Y is a soluble base. Compared to pH of pure water, what will be the pH of solution of X and solution of Y?

Question number: 56

» Chemical Reactions and Equation » Chemical Equations » Writing a Chemical Equation

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What do you mean by a chemical equation?

Question number: 57

» Acids, Bases and Salts » Chemical Properties of Acids and Bases » Reaction of Metallic Oxides With Acids

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The oxide of a metal X was water soluble, when a blue litmus strip was dipped in this solution, it did not go any change in colour. Predict the nature of oxide?

Question number: 58

» Chemical Reactions and Equation » Types of Chemical Reactions » Decomposition Reaction

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Give two examples of thermal decomposition reaction?

Question number: 59

» Chemical Reactions and Equation » Types of Chemical Reactions » Decomposition Reaction

Essay Question▾

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Describe the process of electrolysis of water with the help of a well labelled diagram?

Explanation

Electrolysis of water: It is the decomposition of water into Hydrogen and Oxygen gas, when an electric current is passed through water.

Electrolysis of water

Electrolysis of Water

Process of electrolysis of water

Question number: 60

» Acids, Bases and Salts » How Strong Are Acid or Base Solutions? » pH in Our Digestive System and Cause of Tooth Decay

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Compound A forms enamel of teeth. It is the hardest substance of the body. It does not dissolve in water but it is corroded when pH in the mouth goes below 5.5. How does tooth paste prevent dental decay?

Question number: 61

» Chemical Reactions and Equation » Types of Chemical Reactions » Oxidation and Reduction

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Write down the chemical reactions for rust formation?

Question number: 62

» Acids, Bases and Salts » How Strong Are Acid or Base Solutions? » pH Scale

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What are indicators and what is their use?

Question number: 63

» Chemical Reactions and Equation » Chemical Equations » Writing a Chemical Equation

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With the following materials (a) marble chips (b) dilute hydrochloric acid (c) Zinc granules, name the type of reaction which will occur, when marble chips and Zinc granules are added one by one to acid taken in two separate test tubes?

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