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Q:

Which of the following has the highest boiling point?

A) 2,3-dimethylbutane B) 2-methylpentane
C) 2,2-dimethylbutane D) 1,2-methylpentane
 
Answer & Explanation Answer: C) 2,2-dimethylbutane

Explanation:

Due to the molecules present in the 2,2-dimethylbutane are closely packed, it has the highest boiling point.

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Q:

The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its ___________.

A) Crystallisation B) Melting point
C) Evaporation D) Galvanisation
 
Answer & Explanation Answer: B) Melting point

Explanation:
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Q:

Which of the following is not a type of chemical weathering?

A) Corrosion B) Solution
C) Oxidation D) Carbonation
 
Answer & Explanation Answer: A) Corrosion

Explanation:

Chemical weathering is the process of altering rocks chemically when they are broken down. It includes hydrolysis, oxidation, acid rain, etc...

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Q:

The compound used in prickly-­heat powder to prevent excessive sweating is

A) Boric acid B) Phosphoric acid
C) Carbonic acid D) Sulphonic acid
 
Answer & Explanation Answer: A) Boric acid

Explanation:
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Q:

One turn of the citric acid cycle produces

A) two molecules of carbon dioxide are released B) three molecules of NADH and one molecule of FADH2 are generated
C) one molecule of ATP or GTP is produced D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

One turn of the citric acid cycle produces

 

1. Two molecules of carbon dioxide are released.

2. One molecule of ATP or GTP is produced.

3. Tree molecules of NADH and one molecule of FADH2 are generated.

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Q:

Hydrogenation process is associated with which of the following?

A) Rubber B) Petroleum
C) Copper D) Edible fats
 
Answer & Explanation Answer: D) Edible fats

Explanation:
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Q:

Barbituric Acid was synthesized in 1864 by

A) Adolf von Baeyer B) Marie Curie
C) Mendeleev D) John Dalton
 
Answer & Explanation Answer: A) Adolf von Baeyer

Explanation:

German Chemist, Adolf von Baeyer first synthesized Barbituric Acid in 1864.

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Q:

Isotopes are atoms of the same element that have different

A) numbers of neutrons B) numbers of electrons
C) numbers of protons D) atomic numbers
 
Answer & Explanation Answer: A) numbers of neutrons

Explanation:

Isotopes are variations of an element that have the same charge as the original element, but a different mass, which is caused by either more/less neutrons in the nucleus.

 

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