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 Chemistry Questions

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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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1 2108
Q:

PET is a very familiar form of _____________. It is used for making bottles.

A) Nylon B) Acrylic
C) Polyester D) Rayon
 
Answer & Explanation Answer: C) Polyester

Explanation:
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5 2104
Q:

Which of the following compounds from nitrites with nitrous acid?

A) Primary amines B) Secondary amines
C) Tertiary amines D) All of these
 
Answer & Explanation Answer: D) All of these

Explanation:

The acid and the nitrite form nitrous acid which then reacts with the amine.

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0 2086
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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2 2077
Q:

which of the following molecule contains a nonpolar covalent bond?

A) Br2 B) CO2
C) CCl4 D) CO
 
Answer & Explanation Answer: A) Br2

Explanation:

Br-Br.

In Br2, two of the same atoms, pull on each side of the bond is equal making it as non-polar.

The other options all include a significantly more electronegative atom (the oxygens and the chlorine), so those bonds are all polar covalent.

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0 2076
Q:

Which characteristic is a property of molecular substances?

A) good heat conductivity B) high melting point
C) good heat conductivity D) low melting point
 
Answer & Explanation Answer: D) low melting point

Explanation:

The substances in which two or more atoms are attached together are called as molecular substances. 

 

Properties of molecular substances ::

 

1. Molecular substances are bonded with covalent bonds

2. Bad heat conductivity

3. Bad electrical conductivity

4. Have low melting points.

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2 2071
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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1 2065
Q:

Arrange the following compounds in order of increasing acidity?

A) o-cresol < phenol < o-nitrophtenol B) phenol < o-nitrophtenol < o-cresol
C) o-nitrophtenol < o-cresol < phenol D) None of the above
 
Answer & Explanation Answer: A) o-cresol < phenol < o-nitrophtenol

Explanation:
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0 2062