Chemistry Questions

Q:

Whcih one is the compound in the following

A) mercury B) ozone
C) air D) ammonia
 
Answer & Explanation Answer: C) air

Explanation:
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Q:

Alum is used 

A) as an analgesic B) in the purification of water
C) as a fertilizer D) as a disinfectant
 
Answer & Explanation Answer: B) in the purification of water

Explanation:

Alum is a common alum, potassium aluminum sulphate K2SO4.Al2SO43.24H2O which makes colloidally suspended impurities in water such as clay to settle down.

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Q:

Rutherford's alpha-scattering experiment related to the size of the

A) nucleus B) atom
C) electron D) neutron
 
Answer & Explanation Answer: A) nucleus

Explanation:
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Q:

All atoms of uranium have the same

A) Atomic mass B) Number of electrons
C) Atomic number D) Mass number
 
Answer & Explanation Answer: C) Atomic number

Explanation:

There are many isotopes of uranium and all of them have same atomic number i.e, sum of nmber of neutrons and protons.

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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:

Is water a Pure substance?

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

True, Water is a Pure substance and not a mixture.


 


We know that, A mixture is when two or more substances combine physically together. You can find that the mixture retains the properties of the original components.


In water, two hydrogen atoms combine with one oxygen atom chemically, forming a new substance that has properties different from hydrogen alone or oxygen alone.


 


Therefore, water is not a mixture; it is a compound and it is pure.

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Q:

Acid Precipitation is caused by a mix of

A) Hydrogen, Oxygen, and Saline B) Water, Soil, and Air
C) Respiration, Carbonic Acids, and Seawater D) Sulfur Dioxide, Carbon Dioxide, Nitrogen Oxides
 
Answer & Explanation Answer: D) Sulfur Dioxide, Carbon Dioxide, Nitrogen Oxides

Explanation:

Acid Precipitation or Acid rain is caused by a mix of Sulfur Dioxide, Carbon Dioxide, Nitrogen Oxides.

 

A Chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as Acid Rains.

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Q:

Proteins differ from one another because

A) The peptide bonds linking amino acids differ from protein to protein B) Each protein contains its own unique sequence of sugar molecules
C) The number of nucleotides found in each protein varies from molecule to molecule D) The sequence of amino acids in the polypeptide chain differs from protein to protein
 
Answer & Explanation Answer: D) The sequence of amino acids in the polypeptide chain differs from protein to protein

Explanation:
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