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 Chemistry Questions

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Q:

The Chemical formula of Methanol is _____.

A) C2H5OH B) CH3(OH)2
C) CH3OH D) CH4OH
 
Answer & Explanation Answer: C) CH3OH

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Q:

Which of the following is NOT a primary green house gas in the earth's atmosphere?

A) Methane B) Ozone
C) Nitrous oxide D) Hydrogen
 
Answer & Explanation Answer: D) Hydrogen

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Q:

........... is not a sub atomic particle of an atom.

A) Neutron B) Electron
C) Xenon D) Proton
 
Answer & Explanation Answer: C) Xenon

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Q:

Which of the following bonds are weakest in nature?

A) Single bond B) Double bond
C) Triple bond D) Hydrogen bond
 
Answer & Explanation Answer: D) Hydrogen bond

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Q:

What  is  the  number  of  atoms  in  46  g  of sodium-23 (N = Avogadro constant)?

A) N/2 B) N
C) 2N D) 23 N
 
Answer & Explanation Answer: C) 2N

Explanation:
Number of atoms in 46 grams of sodium - 23 will be 2N.
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Q:

The residual attractive or repulsive forces between molecules or atomic groups that do not arise from a covalent bond, or ionic bonds is called _____

A) Neutral Bond B) Non Polar Bond
C) Electro Valence bond D) Van der Walls bond
 
Answer & Explanation Answer: D) Van der Walls bond

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Q:

An element A forms an oxide with formula A3O4. What is the valency of element A?

A) 3 B) 2
C) 1 D) 4
 
Answer & Explanation Answer: D) 4

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Q:

When iron rusts, its weight .....

A) decreases B) increases
C) remains the same D) first increases and then decreases
 
Answer & Explanation Answer: B) increases

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