What are all the important often asked questions in board exam
Answers
Chapter 1: Chemical Reactions and Equations [Expected weightage - 5 marks]
In the NCERT Textbook of Class 10 Science, 5 types of chemical reaction are given in chapter 1 with some examples. All the reactions are expected to be asked this year’s question paper. Some chemical reactions are also mentioned in the syllabus of practical exam. Those reactions are also important for the board exam.
Details of some very important chemical reactions:
• Action of water on quick lime
• Action of heat on ferrous sulphate crystals
• Iron nails kept in copper sulphate solution
• Reaction between sodium sulphate and barium chloride solutions
Questions on Corrosion & Rancidity are also expected in the paper.
Chapter 2: Acids, Bases and Salts [Expected weightage - 3 marks]
Some of the important topics from which questions are expected to be asked in upcoming CBSE Class 10th Science Board Exam 2019 are given below
Preparation, Reactions, Uses of the following substances:
• Sodium Hydroxide
• Bleaching Powder
• Baking Soda
• Washing Soda,
• Plaster of Paris (Most Important)
Some important portion from the syllabus of practical
Studying the properties of acids and bases (HCl & NaOH) on the basis of their reaction with:
(a) Litmus Solution (Blue/Red)
(b) Zinc Metal
(c) Solid Sodium Carbonate
Chapter 3: Metals and Non-Metals [Expected weightage - 7 marks]
• Properties of Metals and Non-Metals: Physical & Chemical
• Formation and Properties of Ionic Compounds (NaCl, MgCl2),
• Basic Terms Used in Metallurgy: Calcination, Roasting etc.
• Activity Series
• Corrosion and its prevention
CBSE Board Exam 2019: Copy Checking Process vs Expected Marks
Chapter 4: Carbon and its Compounds [Expected weightage – 5 marks]
• Covalent Bonding in Carbon Compounds
• Main Reasons for Forming Large Number of Compounds: Catenation , Tetra-Valency
• Homologous series:
• Nomenclature of Carbon Compounds Containing Functional Groups
(Halogens, Alcohol, Ketones, Aldehydes, Alkanes and Alkynes)
• Saturated & Unsaturated hydrocarbons:
• Chemical Properties of Carbon Compounds
• Ethanol and Ethanoic acid
• Soaps & Detergents
Chapter 5: Periodic Classification of Elements [Expected weightage - 5 marks]
• Gradation in Properties: Valency, Atomic number, Metallic and Non-metallic properties.
You can get such questions by solving previous exams question paper.
You will come to Know that there are many questions which are examiner's favourite question.
Try to solve them and definitely you will do your best in exams.
All the best for exams.