CBSE (Central Board of Secondary Education- Board Exam) Class-10 Science: Questions 78 - 86 of 167

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Question number: 78

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

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What is mechanism of indication of acid and base indicators?

Question number: 79

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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What are the requirements for corrosion to occur?

Question number: 80

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

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Blue crystals of copper sulphate on heating in a dry test tube become colourless. Give reasons.

Question number: 81

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

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What is the difference between endothermic and exothermic reactions?

Question number: 82

» Chemical Reactions and Equation » Chemical Equations » Balanced Chemical Equations

Essay Question▾

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Write down balanced chemical equations for the following statements

1. Hydrogen sulphide burns in the presence of air to give water and sulphur di-oxide

2. Combination of hydrogen gas with nitrogen to give ammonia

3. Reaction of potassium with water to give potassium hydro-oxide and hydrogen gas

Explanation

1.2H2S + 3O2 – > 2H2O + 2SO2

2. N2 +3H2 – > 2NH3

3.2K + 2H2O – > 2KOH + H2

Question number: 83

» Chemical Reactions and Equation » Oxidation Reactions » Rancidity

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What is rancidity of food?

Question number: 84

» Chemical Reactions and Equation » Oxidation Reactions » Rancidity

Short Answer Question▾

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What is rancidity?

Question number: 85

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

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What are the various applications and uses of double displacement reactions?

Question number: 86

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

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In one of the industrial process used for manufacture of sodium hydroxide, a gas A is formed as by product of the reaction. The gas A reacts with lime water to give a compound B which is used as a bleaching agent in chemical industry. Identify A and B giving the chemical equation of the reaction.

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