CBSE (Central Board of Secondary Education- Board Exam) Class-10 Science: Questions 43 - 53 of 167

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Question number: 43

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

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Dry hydrogen chloride gas does not change the colour of blue litmus paper, whereas hydrochloric acid does. Why?

Question number: 44

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

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What is a displacement reaction?

Question number: 45

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

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Give two examples of synthetic and non-synthetic anti-oxidants?

Question number: 46

» Acids, Bases and Salts » How Strong Are Acid or Base Solutions? » Importance of pH in Everyday Life

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What is acid rain?

Question number: 47

» 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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How would we indicate the physical state of reactants or products in a given chemical equation?

Question number: 48

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

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What is a chemical equation?

Question number: 49

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

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A compound A is used for drinking, has pH = 7. Its acidified solution undergoes decomposition in presence of electricity to produce gases B and C. The volume of B is double than C. B is highly combustible whereas C is supporter of combustion. Identify A, B & C and write the chemical reactions involved.

Question number: 50

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

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What are the properties of acids?

Question number: 51

» 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 information regarding physical state we get from the following representations – (g), (l), (aq) and (s)?

Question number: 52

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

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Write down the steps to balance a chemical equation.

Explanation

Reacting substances are reactants on the left hand side of the equation.

Substances formed are products on the right hand side of the arrow.

In chemical equation + implies reacts with and - > implies produces.

Numbers in front of the formulas are coefficients and indicates relative number of molecules

… (94 more words) …

Question number: 53

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

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What is the one important similarity between rusting and burning processes?

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