Science Simplified: Expert Answers to CBSE 10th Std. Textbook Questions
Chapter 1: Chemical Reactions and Equations
Why should a magnesium ribbon be cleaned before burning in air?
A solution of a substance ‘X’ is used for white washing. (i) Name the substance ‘X’ and write its formula. (ii) Write the reaction of the substance ‘X’ named in (i) above with water.
Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.
What does one mean by exothermic and endothermic reactions? Give examples.
Chapter 2: Acids, Bases and Salts
Q: What is the common name of the compound CaOCl₂?
Q: Name the substance which on treatment with chlorine yields bleaching powder.
Q: Name the sodium compound which is used for softening hard water.
Q: What will happen if a solution of sodium hydrocarbonate is heated? Give the equation of the reaction involved.