Chemistry Questions

Q:

The chemical formula of Sodium Carbonate is

A) Na3CO2 B) Na2CO
C) NaCO3 D) Na2CO3
 
Answer & Explanation Answer: D) Na2CO3

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Q:

______ bond holds the atoms together within a water molecule.

A) Nonpolar covalent B) Polar covalent
C) Ionic D) Co­-ordinate
 
Answer & Explanation Answer: B) Polar covalent

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Q:

Which electron dot formula represents a polar molecule?

A) A B) B
C) C D) D
 
Answer & Explanation Answer: B) B

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Q:

The nitrogenous waste of Human Beings is

A) Ammonia B) Urea
C) Ammonium Nitrate D) Uric Acid
 
Answer & Explanation Answer: B) Urea

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Q:

___________ gases absorb long wave (infrared) radiation from the earth and emit it again towards the earth.

A) Carbon dioxide B) Methane
C) Greenhouse D) Ozone
 
Answer & Explanation Answer: C) Greenhouse

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Q:

Which of the following elements has the lowest melting point?

A) Iron B) Nitrogen
C) Iodine D) Lead
 
Answer & Explanation Answer: B) Nitrogen

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Q:

When large quantities of ___ are consumed, it tends to slow metabolic processes and to depress the central nervous system.

A) Butanol B) Propanol
C) Methanol D) Ethanol
 
Answer & Explanation Answer: D) Ethanol

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Q:

What is the common name of the solution of calcium hydroxide?

A) Lime water B) Diet soda
C) Salt solution D) Vinegar
 
Answer & Explanation Answer: A) Lime water

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