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 Chemistry Questions

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Q:

If the atomic number of Krypton is 36, then its electronic configuration is:

A) 2,8,18,8 B) 2,8,20,6
C) 2,18,16 D) 2,18,8,8
 
Answer & Explanation Answer: A) 2,8,18,8

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Q:

In Mendeleev's periodic table, the properties of the elements are considered a periodic function of their:

A) Atomic mass B) Ionization enthalpy
C) Atomic size D) Atomic number
 
Answer & Explanation Answer: A) Atomic mass

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Q:

Removal of carbon particles from air involves the principle of

A) Precipitation B) Filteration
C) Electrophoresis D) Sedimentation
 
Answer & Explanation Answer: C) Electrophoresis

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Q:

What are the main components of Brass Alloy?

A) Copper and Zinc B) Copper and Strontium
C) Copper, Zinc and Nickel D) Copper and Nickel
 
Answer & Explanation Answer: A) Copper and Zinc

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Q:

Which of the following is applied on the top of the matchsticks?

A) Red phosphorus B) White phosphorus
C) Potassium sulphate D) No option is correct
 
Answer & Explanation Answer: A) Red phosphorus

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Q:

Bee sting contains________________

A) An acidic liquid B) a salt solution
C) an alkaline liquid D) a corrosive liquid
 
Answer & Explanation Answer: A) An acidic liquid

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Q:

Which one of the following is an ohmic conductor?

A) Germanium B) Silicon
C) Carbon D) Silver
 
Answer & Explanation Answer: D) Silver

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Q:

A radio-active substance has a half life of six months. Three-fourth of the substance will decay in ______.

A) Six months B) Ten months
C) Twelve Months D) Twenty four months
 
Answer & Explanation Answer: C) Twelve Months

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