Chemical Reactions and Equation-Chemical Equations (CBSE Class-10 Science): Questions 25 - 32 of 33

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Question number: 25

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

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Write chemical equation for burning of magnesium ribbon in air?

Question number: 26

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

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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: 27

» 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?

Question number: 28

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

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What is a balanced chemical equation?

Question number: 29

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

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How are reactants and products distinguished in a chemical equation?

Question number: 30

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

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How do we know that the chemical equation is balanced?

Question number: 31

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

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A water insoluble substance ‘X’ when reacts with dilute H2SO4 released a colourless and odourless gas with a brisk effervescence. When this gas was passed through water, the solution so obtained turned blue litmus red. On passing this gas through lime water, it initially became milky and the milkiness disappeared when the gas was passed in excess. What is the substance ‘X’ and write the chemical equations of the reaction involved?

Question number: 32

» 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?

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