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 Chemistry Questions

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Q:

Which compound is an electrolyte?

A) HCl B) NaCl
C) HBr D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

A substance that dissociates into ions in solution and acquires the capacity to conduct electricity. Sodium, potassium, chloride, calcium, and phosphate are examples of electrolytes, informally known as lytes.

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Q:

The number of electron levels in a magnesium atom is

A) 3 B) 2
C) 1 D) 0
 
Answer & Explanation Answer: A) 3

Explanation:
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Q:

What determines the mass number of an element?

A) Number of protons B) Number of electrons and protons
C) Number of protons and neutrons D) Number of neitrons
 
Answer & Explanation Answer: C) Number of protons and neutrons

Explanation:

The number of protons in an isotope or an atom gives its atomic number whereas the number of protons and neutrons gives its mass number.

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Q:

The compound used in prickly-­heat powder to prevent excessive sweating is

A) Boric acid B) Phosphoric acid
C) Carbonic acid D) Sulphonic acid
 
Answer & Explanation Answer: A) Boric acid

Explanation:
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Q:

Which among the following has the maximum density?

A) Water B) Ice
C) Ethylene D) Acetone
 
Answer & Explanation Answer: A) Water

Explanation:
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Q:

Which base is present in soap?

A) Sodium hydroxide B) Silicon dioxide
C) Calcium hydroxide D) Ammonium hydroxide
 
Answer & Explanation Answer: A) Sodium hydroxide

Explanation:
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Q:

What is an exothermic reaction?

A) Reaction in which heat is released. B) Reaction in which heat is absorbed.
C) Reaction in which neither heat is released nor absorbed. D) None
 
Answer & Explanation Answer: A) Reaction in which heat is released.

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Q:

What is a normal pH level in blood?

A) 7.35 - 7.45 B) 7.45 - 7.55
C) 7.6 - 7.7 D) 7 - 7.10
 
Answer & Explanation Answer: A) 7.35 - 7.45

Explanation:
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