1. Home
  2. |  
  3. CBSE Board |  

CBSE Class 10th Science Board Exam 2019: Important Reactions, Resources & Preparation Tips

Mar 12, 2019 19:23 IST
    CBSE Class 10 Science
    CBSE Class 10 Science

    CBSE Class 10th Science exam 2019 is scheduled to be held on 13th March (Wednesday). Science is one of the important subjects of CBSE Class 10th and students preparing for this subject often search chemical reactions important for Class 10 Science Board Exam 2019. In this article, you will get important chemical reactions, resources (such as Sample Papers, Guess Papers, etc) and few tips for the preparation of the exam.

    CBSE 10th Science Board Exam 2019: Chapter-wise Weightage, Important Diagrams, Topic (Check Link)

    Chapter-wise important reactions for Class 10 Science Board Exam 2019 are given below:

    Chapter 1: Chemical Reactions and Equations

    • Mg + O2 → 2MgO

    • Zn + H2SO4→ ZnSO4 + H2

    • 3Fe + 4H2O → Fe3O4 + 4H2

    • CaO (s)                                 +             H2O (l) →             Ca (OH)2 (aq)

     (Quick lime)                                                                     (Slaked lime)

    • C(s) + O2 (g) → CO2 (g)

    • 2 H2 (g) + O2 (g) → 2H2O (l)

    • CH4 (g) + 2 O2 (g) → CO2 (g) + 2H2O (g)

    • C6H12O6 (aq)    +          6O2 (aq)           →       6 CO2 (aq)       + 6 H2O (l)       + energy

      (Glucose)                     (Oxygen)        

    • 2FeSO4(s)                    →        Fe2O3 (s)          +          SO2 (g)            +          SO3 (g)

      (Ferrous sulphate)                  (Ferric oxide)

    • CaCO3(s)         +          Heat                 →        CaO (s)            +          CO2 (g)

     (Limestone)                                                     (Quick lime)

    • 2Pb (NO3)2 (s)              +          Heat    →        2PbO(s)           +          4NO2 (g)          +          O2 (g)

    (Lead nitrate)                                                   (Lead oxide)               (Nitrogen dioxide)

    • Na2SO4 (aq) + BaCl2 (aq) → BaSO4 (s) + 2NaCl (aq)

    • ZnO + C →Zn + CO

    • MnO2 + HCl →MnCl 2 + 2H2O + Cl2

    Chapter 2: Acids, Bases and Salts

    • Reaction of acids and bases with metals:

    Acid + Metal → Salt + Hydrogen gas

    Example:

    2 NaOH           +          Zn        →        Na2ZnO2          +          H2

                                                                (Sodium zincate)

    Reaction of base and acid to give salt (neutralisation reaction):

    NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

    Other reactions:

    CBSE Science Paper 2019

    Chapter 3: Metals and Non-metals

    • Chemical properties of metals:

    Metal + Oxygen → Metal oxide

    Example:

    • 2Cu + O2 → 2CuO

    • 4Al + 3O2 → 2Al2O3

    Aluminium oxide reacts in the following manner with acids and bases:

    • Al2O3 + 6 HCl → 2 AlCl3 + 3 H2O

    • Al2O3 + 2 NaOH → 2 NaAlO2 + H2O

    Sodium oxide and potassium oxide dissolve in water to produce alkalis:

    • Na2O(s) + H2O (l) → 2 NaOH (aq)

    • K2O(s) + H2O (l) → 2 KOH (aq)

    Reactions of Metal with water

    Metal + Water → Metal oxide + Hydrogen

    Metal oxide + Water → Metal hydroxide

    Example:

    • 2K(s) + 2H2O (l) → 2KOH (aq) + H2 (g) + heat energy

    • 2Na(s) + 2H2O (l) → 2 NaOH (aq) + H2 (g) + heat energy

    • Ca(s) + 2 H2O (l) → Ca (OH)2 (aq) + H2(g)

    • 2 Al (s) + 3H2O (g) → Al2O3 (s) + 3H2 (g)

    • 3 Fe (s) + 4H2O (g) → Fe3O4(s) + 4H2 (g)

    Check formation of NaCl and its electron dot structure form NCERT Textbook.

    Chemical reactions related to extraction of metal are also important for CBSE 10th Science Board Exam 2019:

    Important Chemical Reactions for CBSE 10th Science Board Exam 2019

    Chapter 4: Carbon and its Compounds

    Chemical Properties of Carbon Compounds

    Combustion of carbon and its compounds:

    (i) C + O2 → CO2 + heat and light

    (ii) CH4 + 2O2 → CO2 + 2H2O + heat and light

    (iii) CH3CH2OH + 2O2 → 2CO2 + 3H2O + heat and light

    Oxidation of carbon compounds:

    Conversion of alcohol to carboxylic acid

    Addition Reaction:

    Hydrogenation of vegetable oils using a nickel catalyst:

    Properties of Ethanol:

    Reactions of Ethanol with sodium –

    2Na + 2CH3CH2OH →                        2 CH3CH2O–Na+         +         H2

                                                    (Sodium ethoxide)

    Heating of ethanol:

    Heating ethanol at 443 K with excess concentrated sulphuric acid results in the dehydration of ethanol to give ethene –

    Esterification reaction:

    Esters (sweet-smelling substances used in making perfumes and as flavouring agents) are most commonly formed by reaction of an acid and an alcohol. Ethanoic acid reacts with absolute ethanol in the presence of an acid catalyst to give an ester –

    Saponification:

    Esters react in the presence of an acid or a base to give back the alcohol and carboxylic acid. This reaction is known as saponification because it is used in the preparation of soap.

    Chapter 5 Periodic Classification of Elements

    We don't find any important chemical reaction in this chapter.

    Chapter 6: Life Processes

    Process of photosynthesis

    Chapter 7: Control and Coordination

    We don't find any important chemical reaction in this chapter.

    Chapter 8: How do Organisms Reproduce?

    We don't find any important chemical reaction in this chapter.

    Chapter 9: Heredity and Evolution

    We don't find any chemical reaction in this chapter.

    Chapter 10: Light – Reflection and Refraction

    This chapter doesn’t have any chemical reaction.

    Chapter 11: The Human Eye and the Colourful World

    This chapter doesn’t have any chemical reaction.

    Chapter 12: Electricity

    We don't find any important chemical reaction in this chapter.

    Chapter 13: Magnetic Effects of Electric Current

    We don't find any important chemical reaction in this chapter.

    Chapter 14: Sources of Energy

    Nuclear fusion: Most commonly hydrogen or hydrogen isotopes to create helium, such as

    2H + 2H → 3He (+ n)

    It releases a tremendous amount of energy

    Chapter 15: Our Environment

    Formation of ozone:

    Ozone at the higher levels of the atmosphere is a product of UV radiation acting on oxygen (O2) molecule. The higher energy UV radiations split apart some moleculer oxygen (O2) into free oxygen (O) atoms. These atoms then combine with the molecular oxygen to form ozone as shown—

    Chapter 16: Management of Natural Resources

    We don't find any important chemical reaction in this chapter.

    Important Resources for Prepration of CBSE Class 10 Science Paper 2019 (Links)

    Links to access important resources for the preparation of CBSE 10th Science Board Exams 2019 are given below:

    CBSE Class 10 Science Exam 2019: Important questions with solutions for latest exam format

    CBSE Class 10 Science Sample Paper 2019

    CBSE Class 10 Science Solved Guess Paper 2019

    Quick Tips for Prepration of CBSE Class 10 Science Paper 2019

    1. Follow Latest CBSE Class 10 Science Syllabus 2019
    2. Revise Previous Year Question Papers of Class 10
    3. Refer NCERT textbooks or Class Notes
    4. Solve CBSE Class 10 Sample Papers and Practice Papers

    You can get some more useful tips from the link given below:

    CBSE Class 10 Science Exam 2019: Check These Important Resources and Tips to Score 90%

    CBSE Board Exam 2019: Score full marks in Class 10 Science exam with these tips

    Register to get FREE updates

      All Fields Mandatory
    • (Ex:9123456789)
    • Please Select Your Interest
    • Please specify

    • ajax-loader
    • A verifcation code has been sent to
      your mobile number

      Please enter the verification code below