CBSE Class-10 Science: Questions 87 - 93 of 117

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Question number: 87

» 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: 88

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

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How does acid and base conducts electricity when dissolved in water?

Question number: 89

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

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What are the basis to classify acids into several categories?

Explanation

1. On the basis of their strength, acids are classified as:

Strong acids: Acids which completely dissociate into its ions in aqueous solutions. Example: nitric acid (HNO3) , sulphuric acid (H2SO4), hydrochloric acid (HCl).

Weak acids: Weak acids are those acids which… (175 more words) …

Question number: 90

» 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: 91

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

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What is a balanced chemical equation?

Question number: 92

» 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: 93

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

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A, B and C are three elements which reacts chemically in the following way

A2O3 + 2B → B2O3 + 2A

3CSO4 + 2B → B2 (SO4) 3 + 3C

3CO + 2A → A2O3 +3C

Answer the following

(A) Which element is most reactive?

(B) Which element is least reactive?

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