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 Chemistry Questions

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Q:

Which gas is a source of natural groundwater pollution?

A) Helium B) Krypton
C) Radon D) Argon
 
Answer & Explanation Answer: C) Radon

Explanation:

Radon gas is a source of natural groundwater pollution.

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2 1931
Q:

Which of the following equals one atomic mass unit?

A) one-twelfth the mass of one carbon-12 atom B) the mass of one electron
C) one-sixth the mass of one helium-4 atom D) the mass of one carbon-12 atom
 
Answer & Explanation Answer: A) one-twelfth the mass of one carbon-12 atom

Explanation:

One atomic mass unit (AMU) is equal to the one-twelfth the mass of one carbon-12 atom.

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1 1913
Q:

........... as is used as an illuminating gas.

A) Methyl B) Propane
C) Butene D) Ethyne
 
Answer & Explanation Answer: B) Propane

Explanation:
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0 1912
Q:

The chemical name of common salt is

A) Sodium Chloride B) Potassium Nitrate
C) Sodium Nitrate D) Potassium Chloride
 
Answer & Explanation Answer: A) Sodium Chloride

Explanation:

The chemical name of common salt is Sodium Chloride with a chemical formula NaCl.

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2 1908
Q:

The PCl5 molecule has trigonal bipyramidal structure. Therefore,the hybridization of p orbitals should be

A) sp2 B) sp3
C) dsp2 D) dsp3
 
Answer & Explanation Answer: D) dsp3

Explanation:

The P atom needs five orbitals to form the five P-Cl bonds. It has a 3s and three 3p orbitals, so it must use one of its 3d orbitals to form the fifth bond. These orbitals are hybridized to form five sp3d orbitals that just happen to point in the right directions to form a trigonal bipyramid.

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0 1908
Q:

Brownish film formed on iron when left in open is called?

A) Dust B) Shovel
C) Spade D) Rust
 
Answer & Explanation Answer: D) Rust

Explanation:
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1 1905
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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4 1904
Q:

The common name of sodium bicarbonate is _____.

A) baking soda B) borax
C) bleach D) epsom salt
 
Answer & Explanation Answer: A) baking soda

Explanation:
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3 1899