Chemistry Questions

Q:

What two elements are used to make bronze?

A) Lead and copper B) copper and tin
C) Tin and lead D) copper and iron
 
Answer & Explanation Answer: C) Tin and lead

Explanation:

The two elements that are used to make bronze are tin and lead.

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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) Crystallisation
C) Evaporation D) Evaporation
 
Answer & Explanation Answer: B) Crystallisation

Explanation:
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Q:

Metals that are liquid at room temperature?

A) Caesium B) Gallium
C) Rubidium D) Mercury
 
Answer & Explanation Answer: D) Mercury

Explanation:

Mercury is the only metal that is in liqid form at room temperature. Caesium, Gallim and Rubidium are also metals that are in liquid form but at slightly high temperature than the room temperature.

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Q:

What types of atoms form covalent bonds?

A) metal and metal B) metal and non metal
C) non metal and non metal D) All of the above
 
Answer & Explanation Answer: C) non metal and non metal

Explanation:

Covalent bonds are bonds formed between two non metals by sharing of electrons in their outer most orbits for stable.

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Q:

Which element is not a part of a nitrogenous base?

A) Carbon B) Oxygen
C) Phosphorous D) Nitrogen
 
Answer & Explanation Answer: C) Phosphorous

Explanation:

A nitrogenous base is an element that contains nitrogen that have same chemical properties of the base.

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Q:

Which base is present in soap?

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

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:

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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