Chemistry Questions

Q:

What is the systematic name of PbO?

A) Plumbic oxide B) Lead oxide
C) Lead(II) oxide D) All of the above
 
Answer & Explanation Answer: C) Lead(II) oxide

Explanation:

The systematic name for a chemical is the unique name given to it by the International Union of Pure Applied Chemistry (IUPAC). The IUPAC name can differ from a chemical compound's general name.

 

PbO is an ionic compound since it consists of a Lead as metal and Oxygen as nonmetal. The systematic name for PbO is Lead (II) oxide. Here we need to put the (II) since lead has more than one combining capacity.

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Q:

Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of :

A) An acetylenic triple bond B) Two ethylenic double bonds
C) A vinyl group D) An isopropyl group
 
Answer & Explanation Answer: C) A vinyl group

Explanation:

C=}CH2OzonolysisHCHO

Vinylic group.

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Q:

Group displacement law was given by

A) Bacquerel B) Rutherford
C) Mendeleaf D) Soddy and Fajan
 
Answer & Explanation Answer: D) Soddy and Fajan

Explanation:
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Q:

A/an ___ flame is produced when the oxygen supply is sufficient.

 

A) red B) orange
C) blue D) green
 
Answer & Explanation Answer: C) blue

Explanation:
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Q:

'Minamata' disease was caused by ?

A) Lead B) Mercury
C) Cadmium D) Zinc
 
Answer & Explanation Answer: B) Mercury

Explanation:
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Q:

The element that has the highest first ionization potential is.......

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

Explanation:
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Q:

Water is an example of?

A) Element B) Molecule
C) Compound D) Both B & C
 
Answer & Explanation Answer: D) Both B & C

Explanation:

Why Water Is Not an Element :

An element is a substance consisting of only one type of atom. Water consists of two types of atoms: hydrogen and oxygen.

 

water is both a molecule and a compound :

A compound forms whenever two or more atoms form chemical bonds with each other. The chemical formula for water is H2O, which means each molecule of water consists of one oxygen atom chemically bonded to two hydrogen atoms.

Thus, water is a compound.

 

It's also a molecule, which is any chemical species formed by two or more atoms chemically bonded to each other. The terms molecule and compound mean the same thing and can be used interchangeably.

 

Hence, water is both a molecule and a compound.


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Q:

What is the systematic name of NH4ClO3?

A) Ammonium Chloride B) Ammonium Chlorate
C) Ammonium Chlorane D) Ammonium Chlorine
 
Answer & Explanation Answer: B) Ammonium Chlorate

Explanation:

In common we all call the systematic name of NH4ClO3 as Ammonium Chlorate. But originally the systematic name is azanium trioxidochlorate.

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