Chemical Reactions and Equation (CBSE Class-10 Science): Questions 52 - 58 of 74

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Question number: 52

» 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: 53

» 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: 54

» Chemical Reactions and Equation » Oxidation Reactions » Rancidity

One Liner Question▾

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What is rancidity of food?

Question number: 55

» Chemical Reactions and Equation » Oxidation Reactions » Rancidity

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What is rancidity?

Question number: 56

» 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: 57

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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A road tanker carrying an acid met with an accident and its contents spilled on the road. At the side of the road, iron drain covers began melting and fizzing as the acid ran over them. A specialist was called to see if the acid actually leaked into the nearby river.

(a) Explain how the specialist could carry out a test to see if the river water is contaminated with acid.

(b) The word melting is incorrectly used in the report. Suggest a better name that should have been used.

(c) Explain why drain covers began fizzing as the acid ran over them.

Question number: 58

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

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

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Why lime water turns milky, when carbon di-oxide gas is passed through it?

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