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

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:

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:

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

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