Listen NCERT Audio Books to boost your productivity and retention power by 2X.
Answer the following:
(i) What happens when a concentrated solution of sodium chloride is electrolysed? Write the equation of the reaction involved.
(ii) Why is the electrolysis of a concentrated solution of sodium chloride known as chlor-alkali process?
(iii) Name three products of the chlor-alkali process. State two uses of each product.
Rohan was very angry because of the oil spot on his favourite shirt. His mother want to make him happy and doesn't know what to do. Her neighbour Mrs Sharma advised him to use bleach (bleaching powder, CaOCl2) to remove the oil spot. Read the above passage and answer the following questions.
(i) Would you suggest the same thing to remove oil spot? Why or why not? Justify your answer.
(ii) Which substance, is available in the market to remove such spots?
(iii) What values are associated with Mrs Sharma?
Enamel has calcium phosphate [Ca 3(PO4)2]. When we eat sweets, they form acid in our mouth which reacts and tooth decay starts. To avoid tooth decay, we should brush our teeth after every meal. Sonu brushes his teeth twice a day whereas Monu brushes once a day only. Answer the following questions.
(i) Is toothpaste acidic, basic or neutral? Give reason.
(ii) What values are associated by Sonu, who brushes his teeth twice a day?
Dinesh is a farmer. He got pH of his soil tested and followed advice of Agricultural Scientists of 'Kissan Centre' in growing crops. He got better quality of crops this year. Answer the following questions.
(i) Why should we get our soil tested?
(ii) If soil has pH less than 7, how can we make it neutral?
(iii) What values are possessed by Dinesh?