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Q:

Chemical formula for sulphurous acid is:

A) H2SO4 B) H2SO3
C) H3SO3 D) H3SO4
 
Answer & Explanation Answer: B) H2SO3

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Q:

What is the process of rust forming on iron called?

A) Rusting B) Crystallisation
C) Shovel D) Spade
 
Answer & Explanation Answer: A) Rusting

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Q:

........... compound is used as a drying agent.

A) Calcium oxide B) Calcium carbide
C) Gypsum D) Calcium carbonate
 
Answer & Explanation Answer: A) Calcium oxide

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Q:

The oceanic crust mainly consists of silica and __________.

A) magnesium B) iron
C) manganese D) sulphur
 
Answer & Explanation Answer: A) magnesium

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Q:

Which of the following is an example of thermosetting plastic?

A) Bakelite B) PVC
C) Polyethylene D) No option is correct.
 
Answer & Explanation Answer: A) Bakelite

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Q:

Potassium Permanganate is used for purifying drinking water, because________

A) It is a reducing agent B) It is an oxidising agent
C) It is a sterilising agent D) It dissolves the impurities of water
 
Answer & Explanation Answer: B) It is an oxidising agent

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Q:

Bauxite is an ore/mineral of

A) Aluminium B) Beryllium
C) Lead D) Tin
 
Answer & Explanation Answer: A) Aluminium

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Q:

What is the relative molecular mass of water?

A) 8 u B) 9 u
C) 16 u D) 18 u
 
Answer & Explanation Answer: D) 18 u

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