Chemistry Questions

Q:

Which of the properties of the element is a whole number

A) atomic mass B) atomic number
C) atomic radius D) atomic volume
 
Answer & Explanation Answer: B) atomic number

Explanation:
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Q:

Which of the following definitions describes a chemical hazard?

A) Microorganisms, such as bacteria, fungus, mold, or viruses that can cause illness B) These hazards can lead to injuries to the joints or muscles by way of heavy, frequent lifting, repetitive tasks
C) Can be present in dust, fumes, liquids, solids, mists, vapors, or gases of products used at a site or released during a construction job D) The most commonly thought of hazards for construction
 
Answer & Explanation Answer: C) Can be present in dust, fumes, liquids, solids, mists, vapors, or gases of products used at a site or released during a construction job

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Q:

A mixture of sand and naphthalene can be seperated by __________

A) Fractional distillation B) Sublimation
C) Chromatography D) Any of them
 
Answer & Explanation Answer: B) Sublimation

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Q:

One of the ingredients of the paste on the side of a match box is 

A) Phosphorus pentaoxide B) Phosphorus trichloride
C) Phosphorus trisulphide D) Phosphorus trioxide
 
Answer & Explanation Answer: C) Phosphorus trisulphide

Explanation:

The paste applied to the side of a match box is a mixture of phosphorus trisulphide, glass powder (or sand) to cause friction and glue (binding material)

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Q:

A mixture of ethyl alcohol  and water can be seperated  by 

A) evaporation B) sublimation
C) using a seperating funnel D) fractional distillation
 
Answer & Explanation Answer: D) fractional distillation

Explanation:

Fractional distillation is the process of seperation of a mixture of two or more liquids into the different fractions, which differ fairly widely in their boiling points. The liquid with a lower boiling point will be vaporized first and hence would be the distillate (first fraction). Eg. Ethyl alcohol has a boiling point of 78.10C and water 1000C. When a mixture of these two liquids is heated, alcohol vaporizes first and is collected separately as the distillate. 

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Q:

Wavelength of which of the following colours of the visible spectrum of light are maximally  absorbed by green plants________

A) Green and Yellow B) Red and Blue
C) Green and Red D) Blue and Yellow
 
Answer & Explanation Answer: B) Red and Blue

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Q:

Which half reaction correctly represents reduction?

A) Fe2+ + e- ---> Fe3+ B) Au3+ + 3e– ---> Au
C) Ag ---> Ag+ + e- D) All of the above
 
Answer & Explanation Answer: B) Au3+ + 3e– ---> Au

Explanation:

A half reaction is either the oxidation or reduction reaction component of a redox reaction. A half reaction is obtained by considering the change in oxidation states of individual substances involved in the redox reaction.

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Q:

The Most Important Ore of Aluminium is

A) Calamine B) Monazite
C) Magnetite D) Bauxite
 
Answer & Explanation Answer: D) Bauxite

Explanation:
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