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Q:

Which one of the following triad represents Dobereiner's Triad?

A) Li, Na, K B) Na, Sr, Br
C) Li, K, Na D) Li, Ca, C1
 
Answer & Explanation Answer: A) Li, Na, K

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Q:

What are isobars?

A) Elements with same atomic number but different mass number B) Elements with different atomic number but same mass number
C) Elements with different atomic number and different mass number D) Elements with same atomic number and same mass number
 
Answer & Explanation Answer: B) Elements with different atomic number but same mass number

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Q:

Inert gases are

A) Miscible with water B) Not stable
C) Chemically unreactive D) Chemically very active
 
Answer & Explanation Answer: C) Chemically unreactive

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Q:

......... is a deliquescent compound.

A) Quick lime B) Sulphuric acid
C) Phosphorous pentoxide D) Magnesium chloride
 
Answer & Explanation Answer: D) Magnesium chloride

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Q:

______ character of a bond between two atoms is greater if the difference in their electro negativities is lesser.

A) Polar B) Metallic
C) Ionic D) Covalent
 
Answer & Explanation Answer: D) Covalent

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Q:

Which of the following represents an ion?

A) a particle having 9 protons, 9 neutrons, and 10 electrons B) a particle having 19 protons, 21 neutrons, and 19 electrons
C) a particle having 14 protons, 14 neutrons, and 14 electrons D) a particle having 1 proton, 3 neutrons, and 1 electron
 
Answer & Explanation Answer: A) a particle having 9 protons, 9 neutrons, and 10 electrons

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Q:

Which of the following elements has the lowest melting point?

A) Titanium B) Tungsten
C) Argon D) Nickel
 
Answer & Explanation Answer: C) Argon

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Q:

Which one of the following is commonly used for pulp bleaching in the paper industry?

A) Mild sulphuric acid B) Glucose isomerase
C) peroxide D) Iodine and water
 
Answer & Explanation Answer: C) peroxide

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