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 Chemistry Questions

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Q:

Rust is formed from iron and

A) Carbon B) Oxygen
C) Hydrogen D) All of the above
 
Answer & Explanation Answer: B) Oxygen

Explanation:

Rust is formed from iron and oxygen.

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Q:

The substances which have very low ignition temperature and can easily catch fire with a flame are called _____________ substances.

A) hazardous B) perilous
C) incombustible D) inflammable
 
Answer & Explanation Answer: D) inflammable

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Q:

Nylon threads are made of

A) Polyester polymer B) Polyamide polymer
C) Polyvinyl polymer D) Polysaccharide
 
Answer & Explanation Answer: B) Polyamide polymer

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Q:

What is the maximum  number of states of matter?

A) Three B) Four
C) Five D) Variable
 
Answer & Explanation Answer: C) Five

Explanation:

There   are five known   states   of matter:    solids,    liquids,    gases, plasma and Bose-Einstein condensates.  The  main  difference in the structures of each state is in the densities of the particles.

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Q:

The Chemical formula of Ammonium chloride is ___________.

A) (NH4)2Cl B) NH4Cl3
C) NH4Cl2 D) NH4Cl
 
Answer & Explanation Answer: D) NH4Cl

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Q:

Fe has 26 protons in its nucleus. What are the number of electrons in Fe2+ (II) ion?

A) 24 B) 26
C) 28 D) 13
 
Answer & Explanation Answer: A) 24

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Q:

What is a normal pH level in blood?

A) 7.35 - 7.45 B) 7.45 - 7.55
C) 7.6 - 7.7 D) 7 - 7.10
 
Answer & Explanation Answer: A) 7.35 - 7.45

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Q:

Which base is present in milk of magnesia?

A) Magnesium hydroxide B) Ammonium hydroxide
C) Sodium hydroxide D) Calcium hydroxide
 
Answer & Explanation Answer: A) Magnesium hydroxide

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