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 Chemistry Questions

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Q:

What are cathode rays made of?

Answer

Cathode rays made of beams of electrons.

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Q:

All phosphorus atoms have the same

A) Mass number B) Number of neutrons plus the number of electrons
C) Atomic number D) Number of neutrons plus the number of protons
 
Answer & Explanation Answer: C) Atomic number

Explanation:
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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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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:

Which of the following is also known as Carbolic Acid?

A) Hydroxide B) Sulphuric Acid
C) Ethanol D) Phenol
 
Answer & Explanation Answer: D) Phenol

Explanation:

Phenol with a molecular formula [C6H5OH] is also called as Carbolic Acid. It is a white poisonous clear compound with sweet smell. It is used in making plastics, detergents and drugs.

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Q:

Coagulation during water treatment is designed to remove

A) Sand and gravel B) Bad smells
C) Pathogenic microorganisms D) Particles suspended in water
 
Answer & Explanation Answer: D) Particles suspended in water

Explanation:

Coagulation is a chemical process that involves neutralization of charge. Coagulation during water treatment is designed to remove particles suspended in water.

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Q:

The process of depositing a layer of zinc on iron is called ___________

A) Galvanisation B) Crystallisation
C) Rusting D) Baking
 
Answer & Explanation Answer: A) Galvanisation

Explanation:
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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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