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 Chemistry Questions

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Q:

The complexity and variety of organic molecules is due to

A) their interaction with water B) their tremendously large sizes
C) the chemical versatility of carbon atoms D) the variety of rare elements in organic molecules
 
Answer & Explanation Answer: C) the chemical versatility of carbon atoms

Explanation:

The complexity and variety of organic molecules is due to the chemical versatility of carbon atoms.

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Q:

Which of the following is a chemical formula of quicklime?

A) Ca2O B) Ca2CO3
C) CaO2 D) CaO
 
Answer & Explanation Answer: D) CaO

Explanation:
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Q:

Which of the following is used as non­ stick coating for cooking utensils?

A) Perspex B) Styrofoam
C) Polystyrene D) Teflon
 
Answer & Explanation Answer: D) Teflon

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Q:

Alkali metals can

A) be highly unstable at room temperature B) vaporize at room temperature
C) easily gain electrons D) easily lose electrons
 
Answer & Explanation Answer: D) easily lose electrons

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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:

A change in which one or more new substances are formed is called _________.

A) Physical Change B) Chemical Change
C) Rusting D) Galvanisation
 
Answer & Explanation Answer: B) Chemical Change

Explanation:
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Q:

______ decreases the rate of setting of cement.

A) Alumina B) Silica
C) Gypsum D) Magnesium oxide
 
Answer & Explanation Answer: C) Gypsum

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Q:

All atoms of the same element have the same

A) number of protons B) number of electrons
C) atomic number D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

All atoms of an element have the same number of protons. The number of protons in an element is a primary identifier known as its atomic number. The number of electrons is the same as the number of protons.

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