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- Question
Permanent Hardness of water can be removed by adding
Options- A. Bleaching powder
- B. Chlorine
- C. Wasshing soda
- D. Potassium permanganate
- Correct Answer
- Wasshing soda
ExplanationHardness can be removed by adding sodium carbonate (washing soda) or by passing the water through an ion-exchange column.
Hardness in water is caused by dissolved magnesium ions and calcium ions. These can get into the water when it comes into contact with limestone and other rocks that contain calcium compounds. This can happen, for example, when rainwater flows over these rocks on its way to a reservoir.
Hardness in water is of two types. They are :
1. Temporary hardness
2. Permanent hardness
1. Temporary hardness:: Temporary hardness is caused by dissolved calcium hydrogen carbonate.
2. Permanent hardness:: Permanent hardness is caused by dissolved calcium sulfate. Unlike temporary hardness, it is not removed by boiling the water. - 1. The transverse, longitudinal and surface waves in an earthquake originate from
Options- A. the epicentre within the body of the earth
- B. the focus on the surface of the earth
- C. the focus within the body of the earth
- D. the epicentre on the body of the earth Discuss
- 2. The iron ore mined at Bailadila is mostly
Options- A. haematite
- B. siderite
- C. limonite
- D. magnetic Discuss
- 3. The term yavanika meant
Options- A. foreign goods
- B. dancer
- C. curtain
- D. theatre Discuss
- 4. The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
Options- A. p-electrons in Ne(Z = 10)
- B. s-electrons in Mg(Z = 12)
- C. d-electrons in Fe(Z = 26)
- D. p-electrons in CI(Z = 17) Discuss
- 5. Which of the following is a military alliance?
Options- A. NATO
- B. NAFTA
- C. EEC
- D. ASEAN Discuss
- 6. Mesons are found in
Options- A. Laser beam
- B. X-rays
- C. Gamma rays
- D. Cosmic rays Discuss
- 7. The monetary currency of Greece is called (prior to Jan 1, 2002).
Options- A. guilder
- B. drachma
- C. yen
- D. dinar Discuss
- 8. The wavelength of X-rays is of the order of
Options- A. 10 micron
- B. 1 angstrom
- C. 1 cm
- D. 1 m Discuss
- 9. The languages used in China is
Options- A. Chinese, English
- B. Chinese, Arabic
- C. Chinese, French
- D. Chinese, Korean Discuss
- 10. Who has written the book 'My Frozen Turbulence in Kashmir'?
Options- A. Anees Jung
- B. Jagmohan
- C. M.J.Akbar
- D. Nissim Ezekiel Discuss
More questions
Correct Answer: the focus within the body of the earth
Correct Answer: haematite
Correct Answer: curtain
Correct Answer: p-electrons in CI(Z = 17)
Correct Answer: NATO
Correct Answer: Cosmic rays
Correct Answer: drachma
Explanation:
Correct Answer: 1 angstrom
Explanation:
Correct Answer: Chinese, English
Correct Answer: Jagmohan
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