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Q:

Which of the following has the highest boiling point?

A) 2,3-dimethylbutane B) 2-methylpentane
C) 2,2-dimethylbutane D) 1,2-methylpentane
 
Answer & Explanation Answer: C) 2,2-dimethylbutane

Explanation:

Due to the molecules present in the 2,2-dimethylbutane are closely packed, it has the highest boiling point.

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1 1726
Q:

Which metal is responsible for Itai-Itai disease?

A) Cadmium B) Nickel
C) Chromium D) Mercury
 
Answer & Explanation Answer: A) Cadmium

Explanation:
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0 1721
Q:

The Chemical formula of Ammonium chloride is ___________.

A) (NH4)2Cl B) NH4Cl3
C) NH4Cl2 D) NH4Cl
 
Answer & Explanation Answer: D) NH4Cl

Explanation:
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Q:

Which among the following has lowest electron affinity?

A) Fluorine B) Chlorine
C) Bromine D) Argon
 
Answer & Explanation Answer: D) Argon

Explanation:
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1 1715
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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2 1712
Q:

Which formula represents a polar molecule?

A) C - O B) C - N
C) H - N D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

A chemical bond in which the electrons are not shared equally due to differences in the electronegativity of the atoms.

 

The polarity of a covalent bond is measured using its dipole moment.

 Large dipole moment = more polar

 Small dipole moment = more nonpolar.

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2 1709
Q:

Calcium salts used as fertilizer is:

A) Calcium Carbide B) Calcium Carbonate
C) Calcium Cyanide D) Calcium Sulphate
 
Answer & Explanation Answer: D) Calcium Sulphate

Explanation:
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3 1708
Q:

The most extensive use of molasses after fermentation is for producing

A) Methanol B) Sugar
C) Ethanol D) Sugarcane
 
Answer & Explanation Answer: C) Ethanol

Explanation:
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