1
Q:

The compound MgCl2 is named

A) Magnesium Chloride B) Magnesium Chlorine
C) Magnesium Dichloride D) Dimagnesium Chloride

Answer:   A) Magnesium Chloride



Explanation:

The compound MgCl2 is named as Magnesium Chloride.

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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:

Which compound matches the IR Spectrum?

Which_compound_matches_the_IR_Spectrum11562648897.png image

A) 3 – Hexanol B) Trans – 4 – Octene
C) 1, 5 – Hexadiene D) None of the above
 
Answer & Explanation Answer: C) 1, 5 – Hexadiene

Explanation:

Infrared spectroscopy involves the interaction of infrared radiation with matter. It is used by chemists to determine functional groups in molecules. IR Spectroscopy measures the vibrations of atoms, and based on this it is possible to determine the functional groups.

Here in the given spectrum, there is no alcohol stretch present in the spectrum. There is no vinyl bending present in the spectrum.
 

Hence, both options B and C are compounds that are not matching with IR spectrum. 1, 5 – Hexadiene is the compound matches the IR Spectrum.

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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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2 222
Q:

Which of the following is not a subatomic particle?

A) neutron B) ion
C) electron D) proton
 
Answer & Explanation Answer: B) ion

Explanation:

The particles which makes upon an atom are called subatomic particles. Electrons, protons and Neutrons that makes an atom are called subatomic particles.

Whereas,

An ion is an atom or group of atoms in which the number of electrons is different from the number of protons.

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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:

Tertiary sewage treatment is designed to remove

A) Calcium and Phosphorous B) Nitrogen and Calcium
C) Phosphorous and Nitrogen D) Calcium and Nitrogen
 
Answer & Explanation Answer: C) Phosphorous and Nitrogen

Explanation:

Sewage treatment generally involves three stages, called primary, secondary and tertiary treatment.

Primary treatment consists of temporarily holding the sewage in a quiescent basin where heavy solids can settle to the bottom while oil, grease and lighter solids float to the surface. This removes material that will either float or readily settle out by gravity. It includes the physical processes of screening, comminution, grit removal, and sedimentation.

 

Secondary treatment removes the soluble organic matter that escapes primary treatment. It also removes more of the suspended solids. Removal is usually accomplished by biological processes in which microbes consume the organic impurities as food, converting them into carbon dioxide, water, and energy for their own growth and reproduction.

tertiary_sewage_treatment_is_designed_to_remove1561617455.jpg image

 

Tertiary treatment includes removal of nutrients such as phosphorus and nitrogen and practically all suspended and organic matter from waste water.

 

tertiary_sewage_treatment_is_designed_to_remove_11561617483.jpg image

 

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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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Q:

Rayon is chemically

A) Glucose B) Amylase
C) Cellulose D) Pectin
 
Answer & Explanation Answer: C) Cellulose

Explanation:

Rayon is a versatile fiber. Rayon is chemically Cellulose. It is widely claimed to have the same comfort properties as natural fibers, although the drape and slipperiness of rayon textiles are often more like nylon. It can imitate the feel and texture of silk, wool, cotton and linen. The fibers are easily dyed in a wide range of colors.

Rayon_is_chemically1561456278.jpg image

 

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