Chemistry Questions

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:

What element is used to disinfect swimming pools?

A) Fluorine B) Chlorine
C) Bromine D) Sulphur
 
Answer & Explanation Answer: B) Chlorine

Explanation:
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Q:

Non metal found in liquid state?

A) Chlorine B) Bromine
C) Fluorine D) Iodine
 
Answer & Explanation Answer: B) Bromine

Explanation:

Bromine is the Non metal found in liquid state.

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Q:

In case of a standard hydrogen electrode

A) absolute electrode potential is not zero B) absolute electrode potential is zero
C) both absolute and standard electrode potential values are zero D) electrode potential is zero only at 25 deg C
 
Answer & Explanation Answer: A) absolute electrode potential is not zero

Explanation:

The Standard hydrogen electrode (abbreviated SHE), is a redox electrode which forms the basis of the thermodynamic scale of oxidation-reduction potentials. Its absolute electrode potential is estimated to be 4.44 ± 0.02 V at 25 °C, but to form a basis for comparison with all other electrode reactions, hydrogen's standard electrode potential (E0) is declared to be zero volts only at 298.

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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:

One turn of the citric acid cycle produces

A) two molecules of carbon dioxide are released B) three molecules of NADH and one molecule of FADH2 are generated
C) one molecule of ATP or GTP is produced D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

One turn of the citric acid cycle produces

 

1. Two molecules of carbon dioxide are released.

2. One molecule of ATP or GTP is produced.

3. Tree molecules of NADH and one molecule of FADH2 are generated.

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Q:

Which among the following will be a negative ion?

A) If it has more electrons than protons B) If it has more electrons than neutrons
C) If it has more protons than electrons D) If it has more protons than neutrons
 
Answer & Explanation Answer: A) If it has more electrons than protons

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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