CBSE Class-10 Science: Questions 1 - 12 of 117

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Question number: 1

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

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What happens when electric current is passed through acidified water?

Question number: 2

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

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Give reason, acids conduct electricity only in presence of water.

Question number: 3

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

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What is the basic criteria to write a chemical equation?

Question number: 4

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

Essay Question▾

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Write a note on classification of bases.

Explanation

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

Strong bases: Strong bases are those bases which completely dissociate into its ions in aqueous solutions. Example: sodium hydroxide (NaOH), potassium hydroxide (KOH). Weak bases: Weak bases are those bases which do not completely dissociate into… (66 more words) …

Question number: 5

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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Neha has been collecting silver coins and copper coins. After few days she observed a black coating on silver coins and a green coating on copper coins. Why the coins were coated with black and green coatings? Write the chemical name of black and green coatings.

Question number: 6

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

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Write down a type of double displacement reaction?

Question number: 7

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

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What is oxidation reaction?

Question number: 8

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

Short Answer Question▾

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What is a balanced chemical equation? And why is it important to balance a chemical equation?

Question number: 9

» Acids, Bases and Salts » Chemical Properties of Acids and Bases » How Do Acids and Bases React With Metals?

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With the help of a well labelled diagram, show the process of reaction of acids with metals.

Question number: 10

» Acids, Bases and Salts » Chemical Properties of Acids and Bases » How Do Acids and Bases React With Each Other?

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Define dilution.

Question number: 11

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

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Identify the type of reaction: Na2SO4 + BaCl2 – > BaSO4 +2NaCl?

Question number: 12

» Acids, Bases and Salts » Salts » Family of Salts

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Name the salts of sulphuric acid.

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