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 Chemistry Questions

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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:

Is boiling water a chemical change?

Answer

No. Boiling water is not a chemical change. Because in this process it doesn't loss its properties. It just changes its state i.e, from liquid state to gaseous.


 


Hence, Boiling water is a Physiacl change and not a chemical change.

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0 2103
Q:

A yellow element that stinks when burned

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

Explanation:

A yellow element that stinks when burned is Sulphur.

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1 2092
Q:

Which statement is true of all atoms that are anions?

A) The atom has more electrons than protons B) The atom has more protons than electrons
C) The atom has equal number of protons and electrons D) All of the above
 
Answer & Explanation Answer: A) The atom has more electrons than protons

Explanation:
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Q:

1 Mole of CO2 mass is

A) 32 gms B) 44 gms
C) 16 gms D) 12 gms
 
Answer & Explanation Answer: B) 44 gms

Explanation:

We know that,

Mass of Carbon = 12 gms

Mass of Oxygen = 16 gms = O2 => 16 * 2 = 32 gms

=> Mass of 1 mole of CO2 = 12 + 32 = 44 gms.

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15 2085
Q:

Which among the following is used in making liquors, medicines and as a fuel in aircrafts?

A) Propyl alcohol B) Dimethyl alcohol
C) Ethyl alcohol D) Methyl alcohol
 
Answer & Explanation Answer: C) Ethyl alcohol

Explanation:
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Q:

Glycolysis is the conversion of

A) Glucose to pyruvate B) Glucose to proteins
C) Pyruvate to glucose D) All of the above
 
Answer & Explanation Answer: A) Glucose to pyruvate

Explanation:

Glycolysis is the metabolic process of converting 1 molecule of glucose to 2 molecules of pyruvate through a series of 10 enzyme catalyzed reactions.

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1 2078
Q:

Removal of oil and grease from sewage [waste water]

A) Skimming B) Filtration
C) Screening D) None of the above
 
Answer & Explanation Answer: A) Skimming

Explanation:

Skimming is the removal of any material or particles that are floating on the surface. Hence, Removal of oil and grease from sewage - waste water is called as skimming.

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