CBSE Class-10 Science: Questions 104 - 116 of 117

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Question number: 104

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

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What is respiration in human beings?

Question number: 105

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

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

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Explain why the marble statues often get corroded slowly when kept in open for a long time?

Question number: 106

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

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Name the key ingredient required in the manufacturing of cement?

Question number: 107

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

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Write down the reaction for decomposition of ferrous sulphate?

Question number: 108

» Chemical Reactions and Equation » Types of Chemical Reactions » Double Displacement Reaction

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What is double displacement reaction?

Question number: 109

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

» Chemical Reactions and Equation » Chemical Equations » Writing Symbols of Physical States

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What does the symbol (g) used with water represents?

Question number: 110

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

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Write a note on pH scale.

Question number: 111

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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Write a note on process of corrosion?

Explanation

Corrosion is the process by which metals are eaten away layer by layer, by the action of air, moisture or chemicals on their surface.

Iron when exposed to moist air for a long time acquires a coating of a brown flaky substance called rust.

Silver articles become black after some… (90 more words) …

Question number: 112

» Acids, Bases and Salts » Chemical Properties of Acids and Bases » Acids and Bases in the Laboratory

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Write down a note on properties of bases?

Question number: 113

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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What is the process of corrosion?

Question number: 114

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

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What are olfactory indicators?

Question number: 115

» Acids, Bases and Salts » Chemical Properties of Acids and Bases » Acids and Bases in the Laboratory

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In a first aid manual it was suggested that vinegar should be used to treat wasp sting and baking soda for bee stings.

(i) What does this information tell you about the chemical nature of the wasp stings

(ii) If there were no baking soda in the house, what other household substance could you use to treat bee stings?

Question number: 116

» Acids, Bases and Salts » Common Characteristics of Acids and Bases » Acid or a Base in a Water Solution

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Sneha and Shivam want to prepare dilute H2SO4. Sneha added concentrated H2SO4 to water slowly with constant stirring& cooling whereas, Shivam added water to concentrated H2SO4. Name the student who was correct and why?

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