CBSE (Central Board of Secondary Education- Board Exam) Class-10 Science: Questions 25 - 34 of 167

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Question number: 25

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

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

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Name the type of reactions in the following cases:

a. Garbage producing foul smell

b. Burning of natural gas.

Question number: 26

» Acids, Bases and Salts » Common Characteristics of Acids and Bases » Alkali

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What is alkali?

Question number: 27

» 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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Why should we indicate the physical state of all reactants & products in a chemical equation?

Question number: 28

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

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Why acids do not show acidic behaviour in absence of water?

Question number: 29

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

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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

Question number: 30

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

Essay Question▾

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Write down the chemical properties of acids?

Explanation

Chemical properties of acids:

i) Acids react with active metals to give hydrogen gas. Zn + H2SO4 – > ZnSO4 + H2

ii) Acids react with metal carbonate and metal hydrogen carbonate to give carbon dioxide. NaHCO3 +HCl – > NaCl + H2

… (63 more words) …

Question number: 31

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

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The two gases hydrogen & chlorine do not react with each other even when kept together for a long time. However, when in the presence of sunlight, they immediately combines. Why?

Question number: 32

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

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How do we represent chemical changes in chemistry?

Question number: 33

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

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What is redox reaction?

Question number: 34

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

Essay Question▾

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Balance the following chemical equations:

1. H2 + O2 – > H2O

2. S8 + O2 – > SO3

3. HgO – > Hg + O2

4. Zn + HCl – > ZnCl2 + H2

5. Na + H2O – > NaOH + H2

6. N2 + H2 – > NH3

7. N2 + O2 – > N2O

8. CO2 + H2O – > C6H12O6 + O2

Explanation

1.2H2 + O2 > 2 H2O

2. S8 + 12O 2 > 8 SO3

3.2 HgO > 2Hg + O2

4. Zn + 2HCl > ZnCl2 + H2

5.2Na + 2H2O > 2NaOH + H2

6. N2

… (30 more words) …

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