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 Chemistry Questions

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Q:

PAS is a drug used in the treatment of

A) Cancer B) Typhoid
C) Malaria D) Tuberculosis
 
Answer & Explanation Answer: D) Tuberculosis

Explanation:

Para-amino salicylic acid (PAS) is used in the treatment of Tuberculosis.

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Q:

Which of the following is a Decomposition Reaction?

A) 2HgO ----> 2Hg + O2 B) 6NaNO3 ----> 6NaNO2 + 3O2
C) ZnCO3 ----> ZnO + CO2 D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

All the given reactions are Decomposition reactions.

Decomposition reaction is a reaction in which only one reactant is splitted into two or more products.

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Q:

Which one is not the isotopes of hydrogen

A) Protium B) Deuter
C) Tritium D) All
 
Answer & Explanation Answer: C) Tritium

Explanation:
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Q:

Bullet proof material is made up of which polymer?

A) Poly carbonates B) Poly vinyl
C) Poly amides D) Polychloride
 
Answer & Explanation Answer: A) Poly carbonates

Explanation:

bullet_proof_material_is_made_up_of_which_polymer1551441450.jpg image

bullet proof material is made up of polymer Poly carbonates.

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Q:

Conductivity in a metal results from the metal atoms having

A) highly mobile electrons in the valence shell B) high electronegativity
C) high ionization energy D) highly mobile protons in the nucleus
 
Answer & Explanation Answer: A) highly mobile electrons in the valence shell

Explanation:

The outer most electrons that are free to move are called valency electrons that are responsible for the conductivity in the metal atoms.

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Q:

The acid used in lead storage cells is

A) Sulphuric acid B) Nitric acid
C) Hydrochloric acid D) Phosphoric acid
 
Answer & Explanation Answer: A) Sulphuric acid

Explanation:

The acid used in lead storage cells is Sulphuric acid. They are used car batteries. Lead-acid batteries are capable of being recharged, which is important for their use in cars.

the_acid_used_in_lead_storage_cells_is1545132418.jpg image

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Q:

Browning of paper in old books is caused by

A) oxidation of cellulose B) collection of dust
C) frequent use D) lack of aeration
 
Answer & Explanation Answer: A) oxidation of cellulose

Explanation:
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1 3355
Q:

Covalent bonds hold atoms together because they 

A) fill shells without giving atoms much charge B) bring electrons closer to protons
C) Both A & B D) use forces between nuclei as well as forces between electrons
 
Answer & Explanation Answer: C) Both A & B

Explanation:

Covalent bonds hold atoms together because the attraction between the positively charged nuclei and the negatively charged shared electrons is greater than the repulsions between the nuclei themselves.

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