Name two chemicals used to disinfect wat | Class 7 Science Chapter Wastewater Story, Wastewater Story NCERT Solutions

Welcome to the NCERT Solutions for Class 7 Science - Chapter Wastewater Story. This page offers a step-by-step solution to the specific question from Exercise 1, Question 7: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 7:

Name two chemicals used to disinfect water.

Answer:

It may be necessary to disinfect the treated water with chemicals like chlorine or ozone before releasing it into the distribution system. The purpose of disinfection in the treatment of wastewater is to eliminate completely the harmful micro- organisms in the water to be discharged back into the environment. The treated wastewater can also be passed through layers of sand (called sand filters). Sand filtration removes most of the remaining suspended matter from the treated wastewater. It has been suggested that we should plant Eucalyptus trees all along the sewage ponds. This is because eucalyptus trees absorb all the surplus
wastewater from the sewage ponds rapidly and release pure water vapour into the atmosphere (through transpiration).


Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

  • Read the question carefully and focus on the core concept being asked.
  • Reference examples and data from the chapter when answering questions about Wastewater Story.
  • Review previous year question papers to get an idea of how such questions may be framed in exams.
  • Practice answering questions within the time limit to improve your speed and accuracy.
  • Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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Welcome to the NCERT Solutions for Class 7 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 7: Name two chemicals used to disinfect water.....