Consider the following statements : Hard water is not suitable for I. > drinking. II. > washing cloths with soap. III. > use in boilers. IV. > irrigating crops. Which of these statements are correct ?

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Q: 124 (IAS/2000)
Consider the following statements : Hard water is not suitable for
I. drinking.
II. washing cloths with soap.
III. use in boilers.
IV. irrigating crops.
Which of these statements are correct ?

question_subject: 

Science

question_exam: 

IAS

stats: 

0,12,70,10,12,31,29

keywords: 

{'boilers': [0, 1, 0, 0], 'hard water': [0, 0, 0, 2], 'iv': [6, 110, 77, 8], 'washing cloths': [0, 1, 0, 0]}

Explanation:

  • Hard water contains a high concentration of dissolved minerals, such as calcium and magnesium, which can have negative effects on human health if consumed regularly over a long period of time. Therefore, statement I is correct.
  • When hard water is used for washing clothes with soap, it reacts with soap to form a scum which sticks to the clothes, making it difficult to rinse them properly. Therefore, statement II is correct.
  • The minerals present in hard water can form deposits in boilers and pipes, leading to reduced efficiency and potentially damaging the equipment. Therefore, statement III is correct.
  • The minerals in hard water can also accumulate in soil over time, leading to reduced crop yield. Therefore, statement IV is correct.