Chemistry Questions

Q:

Which of the following describes the process of glycolysis?

A) It represents the first stage in the chemical oxidation of glucose by a cell. B) Breakdown of Glucose
C) Converts Glucose to Pyruvate D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

Glycolysis is the chemical process that converts glucose C₆H₁₂O₆, into Pyruvate, CH₃COCOO− + H⁺.

    • It represents the first stage in the chemical oxidation of glucose by a cell.

 



    • The free energy released in this process is used to form the high-energy molecules ATP and NADH.

 Which_of_the_following_describes_the_process_of_glycolysis1556258113.png image

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Q:

Tetraethyl lead is used as

A) Fire extinguisher B) Gasoline additive
C) Mosquito repellent D) Pain killer
 
Answer & Explanation Answer: B) Gasoline additive

Explanation:

Tetraethyl lead is a highly toxic compound used as a gasoline additive.

Tetraethyl lead abbreviated as TEL, is an organo lead compound with the formula (CH3CH2)4Pb. It is a petro-fuel additive which in turn caused increased vehicle performance. This is also used as an antiknock agent in gasoline and jet fuels. Tetraethyl lead is absorbed rapidly by the skin, the lungs, and the gastrointestinal tract. It is converted to triethyl lead, which might be responsible for its toxicity.

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Q:

Ultimate strength to cement is provided by

A) Di-calcium silicate B) Tricalcium silicate
C) Tetra calcium alumino ferrite D) Tri-calcium aluminate
 
Answer & Explanation Answer: A) Di-calcium silicate

Explanation:
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Q:

A disaccharide is formed by the chemical bonding of

A) two monosaccharides B) two polysaccharides
C) one monosaccharide and one polysaccharide D) All the above
 
Answer & Explanation Answer: A) two monosaccharides

Explanation:

Disaccharides are formed when two monosaccharides join together by the dehydration synthesis reaction resulting in a glycosidic bond between the two monosaccharide molecules. The reaction produces water as a side product.

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Q:

Which one of the following is not true for minerals?

A) they can be a liquid, solid, or glass B) they can be identified by characteristic physical properties
C) they have a specific, internal, crystalline structure D) they have a specific, predictable chemical composition
 
Answer & Explanation Answer: A) they can be a liquid, solid, or glass

Explanation:

A mineral is a naturally occurring, inorganic solid, with a definite chemical composition. They cannot be in liquid or gas state. They exists only in solid state.

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Q:

Which of the following metal is generally used for making filaments of bulb?

A) W B) Ag
C) Fe D) Rh
 
Answer & Explanation Answer: A) W

Explanation:

W is the symbol for chemical element Tungsten or Wolfram.

It is used in making filaments of bulbs.

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Q:

Iodex, a pain relief balm, has the smell of __________ .

A) Methyl salicylate B) Ethyl salicylate
C) Propyl salicylate D) Butyl salicylate
 
Answer & Explanation Answer: A) Methyl salicylate

Explanation:
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Q:

Which statement is NOT true about polymers?

A) Polymers are large molecules composed of small monomeric units B) Polymes are macromolecules
C) Polymers are complex molecules composed of random sequences of atoms D) All the above
 
Answer & Explanation Answer: C) Polymers are complex molecules composed of random sequences of atoms

Explanation:

Polymers are complex molecules composed of random sequences of atoms is the only statement which is not true regarding polymers.

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