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Q:

Harmful bacteria in drinking water cannot be destroyed by 

A) Chlorination B) boiling
C) adding caustic soda D) ozonisation

Answer:   C) adding caustic soda

Explanation:

Water containing caustic soda cannot be used for drinking

Subject: Chemistry
Q:

Recycled plant matter is known as ?

A) Decomposed B) Carbide
C) Compost D) None
 
Answer & Explanation Answer: C) Compost

Explanation:
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Q:

Leakage of which of the following gases caused the Bhopal gas tragedy ?

A) Carbon monoxide B) Methyl isocyanate
C) Nitrous oxide D) Hydrogen sulphide
 
Answer & Explanation Answer: B) Methyl isocyanate

Explanation:
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2 55
Q:

Which one of the following is used to induce artificial rain ?

A) Potassium Nitrate B) Ammonium chloride
C) Calcium carbonate D) Silver lodide
 
Answer & Explanation Answer: D) Silver lodide

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2 75
Q:

A ‘breath test’ used by traffic police to check drunken driving uses ____?

A) Turmeric on filter paper B) Silica gel coated with silver nitrate
C) potassium permanganate-sulphuric acid D) Potassium dichromatic-sulphuric acid
 
Answer & Explanation Answer: D) Potassium dichromatic-sulphuric acid

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Q:

The enzyme that converts glucose to ethyl alcohol is 

A) Maltase B) Zymase
C) Diastase D) Invertase
 
Answer & Explanation Answer: B) Zymase

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