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Q:

In water treatment plant, use of chloramines ensures __________

A) taste and odour control B) weed control in reservoirs
C) disinfection D) removal of permanent hardness
 
Answer & Explanation Answer: C) disinfection

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Q:

What is the net charge on Calcium fluoride?

A) 1+ B) 0
C) 1­- D) 2­-
 
Answer & Explanation Answer: B) 0

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Q:

Which among the following has highest electron affinity?

A) Chlorine B) Fluorine
C) Helium D) Xenon
 
Answer & Explanation Answer: A) Chlorine

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Q:

Cinnabar is an ore/mineral of

A) Lead B) Manganese
C) Molybdenum D) Mercury
 
Answer & Explanation Answer: D) Mercury

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Q:

Which of the following statement is INCORRECT regarding Sodium?

A) Sodium reacts vigorously with oxygen and water B) A lot of heat is generated when sodium reacts with water and oxygen
C) It is stored in kerosene D) It is a non-metal
 
Answer & Explanation Answer: D) It is a non-metal

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Q:

What is the chemical formula of Ozone?

A) O B) O2
C) O3 D) O4
 
Answer & Explanation Answer: C) O3

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Q:

Which of the following elements has the lowest melting point?

A) Tin B) Hydrogen
C) Carbon D) Sodium
 
Answer & Explanation Answer: B) Hydrogen

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Q:

Which element is not a part of a nitrogenous base?

A) Hydrogen B) Phosphorous
C) Carbon D) Nitrogen
 
Answer & Explanation Answer: B) Phosphorous

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