August 5, 2026
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August 5, 2026
NCERT Textbook: Cell: The Building Block of Life
August 1, 2026
Previous Year Questions: Chemical Reactions & Equations
Previous Year Questions 2026 Q1. (i) AgNO3+NaCl⟶NaNO3+AgCl(ii) K2SO4+BaCl2⟶BaSO4+2KClWhich of the following options clearly describes both the reactions ? [1 Mark](A) (i) is double displacement, (ii) is displacement reaction.(B) Both, (i) and (ii) are displacement reactions and precipitation reactions.(C) Both, (i) and (ii) are double displacement reactions and precipitation reactions.(D) (i) is displacement, (ii) is double displacement […]August 1, 2026
Practice Questions: Chemical Reactions & Equations
Fill in the Blanks Q 1. Addition of hydrogen in a substance in a reaction is known as ______ reaction. Q 2. In a ______ reaction, two or more substances combine to form a new single substance. Q 3. Unbalanced reactions are also known as ______. Q 4. Reactions in which heat is given out […]August 1, 2026
Short Answer Questions: Chemical Reactions & Equations
Q1: What is a Chemical Reaction? Q2: What is a balanced chemical equation? Why is it necessary to balance a chemical equation? Q3: What is the method of balancing chemical equations?Ans: The hit-and-trial method is used to balance simple chemical equations. In this method, coefficients before the symbols/formulae of the reactants and products are adjusted in such a […]August 1, 2026
Chapter Notes: Chemical Reactions & Equations
In our daily lives, physical changes involve alterations in appearance or state without creating new substances, like melting ice. On the other hand, chemical changes result in the formation of entirely new substances, such as cooking food or rusting iron. Recognizing these changes helps us understand when a chemical reaction occurs. What is a Chemical Reaction? A chemical reaction […]July 28, 2026
Case Based Questions: Describing Motion Around Us
Q1: Read the source below and answer the questions that follow: Kavya, a class 9 student, was practising for her school’s sports day on a straight running track. She started from point O, ran to point A which was 300 m ahead, and then turned back, running 100 m to reach point B, where her […]July 28, 2026
NCERT Solutions: Describing Motion Around Us
Page 48 – Think It Over Q1: How much distance should we maintain from the truck ahead to avoid a collision if it suddenly applies the brakes?Ans: We should maintain a safe distance from the truck ahead so that there is enough time to stop the vehicle if the truck suddenly applies brakes, thus avoiding a […]July 28, 2026