CBSE Class-10 Science: Questions 13 - 24 of 117

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Question number: 13

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

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What is the name of group of chemical substances used to prevent oxidation?

Question number: 14

» 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 bases?

Explanation

Chemical properties of Bases:

i) Reaction with Metals - Certain reactive metals such as Zinc, Aluminium, and Tin react with alkali solutions on heating and hydrogen gas is evolved.

2NaOH + Zn – > Na + 2 ZnO2 +H2

ii) Reaction with acids -Bases react with acids to… (61 more words) …

Question number: 15

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

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What chemical law is the basis of, balancing of chemical equation?

Question number: 16

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

One Liner Question▾

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Silver articles get black coating when in contact with air. Name the phenomenon

Question number: 17

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

Short Answer Question▾

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With the help of a well labelled diagram, Explain the chlor-alkali process?

Question number: 18

» Chemical Reactions and Equation » Oxidation Reactions » Rancidity

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While packing food articles, why do manufacturers flush out oxygen with nitrogen?

Question number: 19

» 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: 20

» 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: 21

» 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: 22

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

Essay Question▾

Describe in Detail

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: 23

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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Why do we need to apply paint on iron articles?

Question number: 24

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

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Give the name of one metal which does not corrode.

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