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 Chemistry Questions

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Q:

Ethane gas has a slightly ______ taste.

A) sweet B) bitter
C) sour D) salty
 
Answer & Explanation Answer: A) sweet

Explanation:
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Q:

The number of electron levels in a magnesium atom is

A) 3 B) 2
C) 1 D) 0
 
Answer & Explanation Answer: A) 3

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Q:

What element is used to disinfect swimming pools?

A) Fluorine B) Chlorine
C) Bromine D) Sulphur
 
Answer & Explanation Answer: B) Chlorine

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Q:

The atomic mass of an element depends upon the

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

Explanation:

The atomic mass of an element depends upon the number of protons, electrons and neutrons in the atoms which make the elements.

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Q:

The chemical makeup of a rock is

A) Nutrients B) Minerals
C) Metals D) Water
 
Answer & Explanation Answer: B) Minerals

Explanation:

The chemical composition of a rock is mainly minerals.

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Q:

At low temperature, Lead behaves as a :

A) Semi conductor B) Super conductor
C) Insulator D) Conductor
 
Answer & Explanation Answer: B) Super conductor

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Q:

Synthetic detergents are prepared from

A) potassium salts of higher fatty­acids B) sodium salts of higher fatty­acids
C) hydrocarbons of petroleum D) glycerides
 
Answer & Explanation Answer: C) hydrocarbons of petroleum

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Q:

Which molecule is nonpolar and has a symmetrical shape?

A) NH3 B) HCl
C) H2O D) CH4
 
Answer & Explanation Answer: D) CH4

Explanation:

Among the given options, CH4 is a non polar molecule with symmetrical tetrahedral shape.

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