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 Chemistry Questions

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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:

The maximum fixation of solar energy is done by

A) Bacteria B) Protozoa
C) Fungi D) Green plants
 
Answer & Explanation Answer: D) Green plants

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Q:

Absolute Zero is defined as

A) The temperature at which all molecular motion ceases B) At which water boils at 298K
C) At which liquid Helium boils D) At which the volume becomes zero
 
Answer & Explanation Answer: A) The temperature at which all molecular motion ceases

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Q:

According to Dalton’s Atomic Theory, the smallest indivisible particles of matter is called ______.

A) molecule B) atom
C) compound D) element
 
Answer & Explanation Answer: B) atom

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Q:

On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because ________

A) Mercury is a metal B) Density of mercury is greater than that of water
C) Cohesion of mercury is greater than its adhesion with glass D) Cohesion of water is greater than its adhesion with glass
 
Answer & Explanation Answer: C) Cohesion of mercury is greater than its adhesion with glass

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Q:

Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?

A) BBr3 B) NH3
C) CH2N2 D) CCl2F2
 
Answer & Explanation Answer: D) CCl2F2

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Q:

Atomic number of which of the following elements is greater than that of Aluminium?

A) Phosphorus B) Neon
C) Magnesium D) Sodium
 
Answer & Explanation Answer: A) Phosphorus

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Q:

Which of the following is essential for the synthesis of thyroxin?

A) Potassium B) Calcium
C) Iodine D) Sodium
 
Answer & Explanation Answer: C) Iodine

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