Contact us

Comments

Post a Comment

Popular posts from this blog

CLASS XII Physics MCQs

Class 10 Physics MCQs Class 10 Physics MCQs Here are 30 Multiple Choice Questions (MCQs) for Class 10 Physics based on the NCERT syllabus . These questions cover topics from Light – Reflection and Refraction , Human Eye and the Colorful World , Electricity , and Magnetic Effects of Electric Current . Light – Reflection and Refraction 1. The image formed by a plane mirror is: a) Real and inverted b) Virtual and erect c) Real and erect d) Virtual and inverted 2. The focal length of a concave mirror is 20 cm. Its radius of curvature is: a) 10 cm b) 20 cm c) 40 cm d) 5 cm 3. A concave mirror forms a real and inverted image of an object at a distance of 40 cm from the mirror. If the object is placed at 20 cm from the mirror, the image will be: a) Real and inverted b) Virtual and erect c) Real and e...
Read more

Chapter 4: Carbon and Its Compounds (notes with previous years questions)

Class 10 Science - Chapter 4: Carbon and Its Compounds Class 10 Science - Chapter 4: Carbon and Its Compounds 1. Introduction to Carbon Carbon is the 4 th most abundant element in the universe and the 15 th most abundant element in the Earth's crust. Atomic number of carbon : 6 Electronic configuration : 2, 4 Carbon achieves stability by sharing electrons, forming covalent bonds . 2. Why Carbon is Unique 1. Catenation : Carbon can form long chains, branched chains, and rings by bonding with other carbon atoms. Example: Ethane (C 2 H 6 ), Propane (C 3 H 8 ), Benzene (C 6 H 6 ). 2. Tetravalency : Carbon can form 4 covalent bonds with other atoms (e.g., hydrogen, oxygen, nitrogen, etc.). Example: Methane (CH 4 ), Carbon tetrachloride (CCl 4 ). 3. Formation of Multiple Bonds : Carbon can form single (C-C) , double (C=C) , or triple (C≡C)...
Read more

Chapter 5: Periodic Classification of Elements (Notes with questions and answers)

Class 10 Science - Chapter 5: Periodic Classification of Elements Class 10 Science - Chapter 5: Periodic Classification of Elements 1. Introduction The periodic table is a tabular arrangement of elements based on their atomic number , electronic configuration , and chemical properties . The classification of elements helps in understanding the trends and periodic properties of elements. 2. Early Attempts at Classification 1. Dobereiner's Triads : Grouped elements into triads (groups of three) with similar properties. The atomic mass of the middle element was approximately the average of the other two. Example: Lithium (Li) , Sodium (Na) , Potassium (K) . 2. Newlands' Law of Octaves : Arranged elements in increasing order of atomic mass. Observed that every 8 th element had propertie...
Read more