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 Chemistry Questions

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Q:

Stoichiometry is based on

A) Law of conservation of energy B) Law of conservation of mass
C) Newton's 1st law D) Kepler's law
 
Answer & Explanation Answer: B) Law of conservation of mass

Explanation:

Stoichiometry is a branch of chemistry deals with the calculations on reactants and products. It is based on the Law of conservation of mass where total mass of reactants is equal to total mass of products.

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Q:

A feature of catabolic reactions is that they

A) occur only in mitochondria B) occur only during loss of body weight
C) involve release of energy D) involve consumption of energy
 
Answer & Explanation Answer: C) involve release of energy

Explanation:
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Q:

Kaolin is chemically classified as

A) Argillaceous rock B) Silicious rock
C) Metamorphic rock D) Calcareous rock
 
Answer & Explanation Answer: A) Argillaceous rock

Explanation:

Kaolin is chemically classified as Argillaceous rock.

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Q:

The pH value of a sample of multiple-distilled water is

A) zero B) 14
C) very near to zero D) very near to seven
 
Answer & Explanation Answer: D) very near to seven

Explanation:

Water  is  neutral  and  has  a  pH value  of  7  and  because  here it  is multiple distilled water, it would be very near to seven

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Q:

Which of the following is a polymer?

A) Glycerol B) Amino acid
C) Nucleic acid D) Fatty acid
 
Answer & Explanation Answer: C) Nucleic acid

Explanation:

Nucleic acid is a polymer among the given options.

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Q:

Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water

A) Magnesium B) Calcium
C) Manganese D) Chromium
 
Answer & Explanation Answer: C) Manganese

Explanation:
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Q:

The mass number of an isotope of an element is 298. If its nucleus has 189 neutrons, what is its atomic number?

A) 298 B) 189
C) 109 D) 487
 
Answer & Explanation Answer: C) 109

Explanation:
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Q:

Which of the following processes is endothermic?

A) Melting of ice B) Mixing of potassium chloride with water
C) Photosynthesis D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

The process which involves absorption of heat is endothermic.

Here given all the options are involving in absorption of heat. Hence, all the above are endithermic.

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