Chemical Reactions and Equation (CBSE Class-10 Science): Questions 12 - 21 of 74

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Question number: 12

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

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A student burnt a metal X found in the form of ribbon. The ribbon burnt with a dazzling flame & a white powder Y is formed which is basic in nature. Identify X &Y. Write the balanced chemical equation for this reation.

Question number: 13

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

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What process takes place chemically when quicklime is added to water?

Question number: 14

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

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

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Give one example of photochemical reaction.

Question number: 15

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

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Write down the steps in details to balance a chemical equation.

Explanation

Step-1: In order to balance a chemical equation, first draw boxes around each formula. Don’t change anything in the box while balancing the equation.

[Fe] + [H2O] – > [Fe3O4] + [H2]

Step-2: List the number of atoms of different… (253 more words) …

Question number: 16

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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Why do we need to apply paint on iron articles?

Question number: 17

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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Give the name of one metal which does not corrode.

Question number: 18

» 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: 19

» 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: 20

» 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: 21

» 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?

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