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 Chemistry Questions

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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 1887
Q:

Liquid sodium is being considered as

A) engine coolant B) bleaching agent
C) antiseptic D) None of the above
 
Answer & Explanation Answer: A) engine coolant

Explanation:

Liquid sodium is being considered as engine coolant.

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2 1885
Q:

What is the percentage of oxygen in Al2(SO4)3?

A) 57.7% B) 56.1%
C) 53.1% D) 52.6%
 
Answer & Explanation Answer: B) 56.1%

Explanation:
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1 1880
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 1879
Q:

What is the general formula for a straight-chain alkane?

A) C2nH2n+3. B) CnH2n+2
C) CnH2n D) CnH3n+2.
 
Answer & Explanation Answer: B) CnH2n+2

Explanation:
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1 1871
Q:

Atomic number is always equal to ______.

A) Number of protons B) Number of neutrons
C) Number of electrons D) Sum of protons and neutrons  
 
Answer & Explanation Answer: A) Number of protons

Explanation:
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1 1870
Q:

German Silver contains

A) 100% pure silver B) 10% silver
C) 1% silver D) 0% silver
 
Answer & Explanation Answer: D) 0% silver

Explanation:

German Silver is an alloy of copper, nickel and zinc. It is composed of 60% copper, 20% nickel and 20% zinc. Due to its white-silverish appearance it is named as german silver but it contains no silver in it.

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0 1868
Q:

SO2 Polar or Nonpolar?

Answer

SO2 has a net dipole moment and has a bent shape in its structure as water molecule. Hence it is a polar molecule.

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2 1863