question_answer

   (a) What happens when crystals of washing soda are left open in dry air? (b) Name the change that takes place. Which two industries are based on the use of  5 washing soda? (c) With the help of balanced chemical equation, state the reaction that takes place when sodium hydrogen carbonate is heated during cooking.  

Answer:

                  On scrubbing, its colour changes from yellow to reddish brown. It happens because soap is basic in nature and the colour of turmeric changes from yellow to reddish brown in basic medium. When the shirt is washed with plenty of water, the stain turns yellow again.               (3)