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 Chemistry Questions

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Q:

Decane has how many hydrogen atoms?

A) 22 B) 24
C) 11 D) 33
 
Answer & Explanation Answer: A) 22

Explanation:
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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:

Why is argon gas used along with tungsten wire in an electric bulb?

A) To increase the life of the bulb B) To reduce the consumption of electricity
C) To make the emitted light colored D) To reduce the cost of the bulb
 
Answer & Explanation Answer: A) To increase the life of the bulb

Explanation:

Argon gas is used in fluorescent and incandescent light bulbs to stop the oxygen in the light bulbs from corroding the hot tungsten filament.

The use of argon in light bulbs prevents the evaporation of the tungsten filaments, which results in increased light bulb life.

Argon is also used to create an inert atmosphere for growing semiconductor crystals, arc welding and for processes that need protection from other kinds of atmospheric gases.

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Q:

Non metal found in liquid state?

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

Explanation:

Bromine is the Non metal found in liquid state.

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1 1506
Q:

Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?

 

A) Element with 18 neutrons and 20 protons  B) Element with 19 neutrons and 18 protons 
C) Element with 19 neutrons and 20 protons  D) Element with 18 neutrons and 22 neutrons
 
Answer & Explanation Answer: D) Element with 18 neutrons and 22 neutrons

Explanation:
Isobar: one of two or more atoms having equal atomic weights but different atomic numbers.
 
                    Mass number     Electrons      Neutrons
    Calcium            40                    20                 20
 
     Argon              40                    18                 22
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Q:

Which of the following is a Synthetic rubber?

A) Leoprene B) Monoprene
C) Neoprene D) Isoprene
 
Answer & Explanation Answer: C) Neoprene

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Q:

Which properties are characteristic of the group 1 metals?

A) Low melting points B) Produce hydrogen when react with water
C) Soft in nature D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Group 1 metals are also called as alkali metals with reactive in nature and low melting points. They are soft and produce hydrogen and alkaline metal hydroxide solution when they react with water.

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0 1499
Q:

Kidney stones are composed of ______.

A) Calcium Oxalate B) Sodium Chloride
C) Magnesium Nitrate D) Calcium Bicarbonate
 
Answer & Explanation Answer: A) Calcium Oxalate

Explanation:
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