Sound Notes Sound:- Sound is a form of energy which produces a sensation of hearing in our ears. Vibration:- A kind of rapid to and fro motion of an object is called vibration. Sound is produced by vibrating objects. Wave:- A wave is a disturbance that moves through a medium when the particles of medium […]
Acids, Bases and Salts Previous Years Questions Few drops of aqueous solution of ammonium chloride are put on a universal indicator paper. The paper turns pink. Study the following table and choose the correct option. [1 mark] [ CBSE 2023] Two salts ‘X’ and ‘Y’ are dissolved in water separately. when phenolphthalein is added to […]
Acids, Bases and Salts Important Questions Name the substance used in softening water. Tooth enamel is the hardest substance of the body due to which substance? What are alkalies? Give examples. Why should curd and sour substances not be kept in brass and copper vessels? You have been provided with three test tubes containing distilled […]