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 Chemistry Questions

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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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Q:

Isotopes are atoms of the same element that have different

A) mass numbers B) atomic numbers
C) protons D) All of the above
 
Answer & Explanation Answer: A) mass numbers

Explanation:

Isotopes are atoms of the same element that have different mass numbers.

Example : Hydrogen, Deutirium and tritium all these have different mass but same atomic numbers.

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Q:

Group 7A of the periodic table contains the

A) most reactive metals B) least reactive non metals
C) most reactive non metals D) least reactive metals
 
Answer & Explanation Answer: C) most reactive non metals

Explanation:
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Q:

The (O-H) bond in CH3OH is _____.

A) polar covalent B) ionic
C) non polar covalent D) cationic
 
Answer & Explanation Answer: A) polar covalent

Explanation:
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Q:

........... as is used as an illuminating gas.

A) Methyl B) Propane
C) Butene D) Ethyne
 
Answer & Explanation Answer: B) Propane

Explanation:
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Q:

Which molecule is nonpolar and has a symmetrical shape?

A) NH3 B) HCl
C) H2O D) CH4
 
Answer & Explanation Answer: D) CH4

Explanation:

Among the given options, CH4 is a non polar molecule with symmetrical tetrahedral shape.

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Q:

What happens to electrons in an ionic bond?

A) collision of electrons B) Sharing of electrons
C) Both A & B D) Transfer of electrons
 
Answer & Explanation Answer: D) Transfer of electrons

Explanation:

An ionic bond is formed between two molecules when transfer of valency electrons take place between them. 

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Q:

In a concentrated solution there is

A) no solute B) a large amount of solvent
C) no solvent D) a large amount of solute
 
Answer & Explanation Answer: D) a large amount of solute

Explanation:

In a concentrated solution there is a large amount of solute.

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