Chemistry Quiz - General Knowledge Questions and Answers

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Which of the following is not combustible?

A)
O2

B)
H2

C)
Butane

D)
Methane


Correct Answer :

O2


Explanation :

The O2 gas itself is not flammable or combustible. Our atmosphere is roughly 79% N2 and 21% O2.

The sunlight energy used by green plants in photosynthesis is transformed into ?

A)
chemical energy

B)
physical energy

C)
Both (A) and (B)

D)
None of the above


Correct Answer :

chemical energy


Explanation :

Photosynthesis: In the process of photosynthesis, plants convert radiant energy from the sun into chemical energy in the form of glucose - or sugar.

Water (6H2O) + carbon dioxide (6 CO2) + sunlight (radiant energy) = glucose (C6H12O6) + Oxygen (6O2).

Complete the following equation
hydrochloric acid + sodium hydroxide -->

A)
Sodium chloride + Water

B)
Sodium hydrogen chloride + Sodium

C)
Sodium chloride + Hydrogen

D)
Sodium chloride + Oxygen


Correct Answer :

Sodium chloride + Water


Explanation :

HCl + NaOH⟶NaCl+H2O

Which of the following is monomer of P.V.C?

A)
Ethylene

B)
Acrylonitrile

C)
Ethylene glycol

D)
Vinyl chloride


Correct Answer :

Vinyl chloride


Explanation :

Polyvinyl chloride (PVC), is made from vinyl chloride (CH2 =CH –Cl) monomer.

PVC is used as a good insulating material , rain coats, curtain cloths, hand bags, toys, artificial floors, gramophone records and wires and other electrical goods.

Teflon is formed by polymerisation of the following monomer :

A)
CH2= CH2

B)
CH2= CHCl

C)
F2C=CF2

D)
C6H5CH=CH2


Correct Answer :

F2C=CF2


Explanation :

Teflon (Polytetrafluoroethylene) is a polymer that is made of polymerization of Tetrfluoroethylene( F2C=CF2 )

Teflon is used as a material resistant to heat & chemical attack.It is also used for making gaskets, pump packings, valves, oil seals,non lubricated bearings.

According to Lewis concept of acid- bases, Lewis acid are :-

A)
Proton accepters

B)
Proton donars

C)
Electron pair accepters

D)
Electrons pair donor


Correct Answer :

Electron pair accepters


Explanation :

Chemist Gilbert Newton Louise defined the Lewis Acid and Lewis Base in the year 1923.According to-

Lewis acid:Lewis acid is any acid which is an electron pair acceptor.
Lewis Base:Lewis base is any base which is an electron pair donor.

Galvanisation is a method of protecting iron from rusting by coating with thin layer of a metal,which of the following metal is used for this purpose?

A)
Copper

B)
Aluminium

C)
Zinc

D)
Chromium


Correct Answer :

Zinc


Explanation :

Zinc is used for galvanizing other metals like steel and iron.

Zinc is more reactive than steel and iron, when the oxygen in the air reacts with the surface of the zinc, a very thin layer of oxide and protects the metal from further corrosion.

Alkaline hydrolysis of oils and fats is called?

A)
Neutralisation

B)
Esterification

C)
Polymerization

D)
Saponification


Correct Answer :

Saponification


Explanation :

Soaps are sodium or potassium salts of long chain fatty acids.Which are salts made from the alkaline hydrolysis of fats and oils (triglycerides).

When triglycerides in fat/oil react with aqueous NaOH(Sodium hydroxide) or KOH(Potassium hydroxide), they are converted into soap and glycerol. This is called alkaline hydrolysis of esters.
Since this reaction leads to the formation of soap, it is called the Saponification process.

Which has highest calorific value?

A)
Charcoal

B)
Cow dung

C)
Wood

D)
Biogas


Correct Answer :

Biogas


Explanation :

Calorific value: is defined as the amount of heat energy produced on the complete combustion of a material or fuel. It is expressed in a unit called kilojoule per kg. The higher the calorific value of a fuel, the more is its efficiency.

Biogas refers to a mixture of various gases generated by the breakdown of organic matter in the absence of oxygen. It can be produced from raw materials such as agricultural waste, municipal waste, plant material, sewage, green or food waste.

Which of the following variety of coal contains highest percentage of carbon?

A)
Bituminous

B)
Anthracite

C)
peat

D)
Lignite


Correct Answer :

Anthracite


Explanation :

Coal is a fossil fuel that is made from plant residues which lived and died million of years ago when parts of the earth were covered with huge swampy forests. Coal is classified as a nonrenewable energy source because it takes millions of years to build.

Coal is classified into four main types are peat, lignite, bituminous, and anthracite.

Peat Contains less than 40 to 55 per cent carbon.It is the first step in coal formation.peat contains a lot of moisture. It is a very soft brown coal.

Lignite coal usually contains 40%–55% carbon.It is a soft brown coal that still contains a high amount of moisture.This is lower grade coal.

Bituminous coal contains 45%–86% carbon. It is most widely available and used.It is a dense, compact, and is usually in black colour.

Anthracite coal contains 86%–97% carbon and generally has the highest heating value of all ranks of coal. It is hard and dark black in color,and has very light weight when compared to other forms of coal, as there is very little moisture present in it.It is the highest grade of coal.

In chemistry, soap is a salt of a ?

A)

fatty acid


B)

glycol


C)

phosphorus


D)

ammonium carbonate



Correct Answer :

fatty acid


Explanation :

Soaps are sodium or potassium salts of long chain fatty acids.Which are salts made from the alkaline hydrolysis of fats and oils (triglycerides).

Who invented Aspirin?

A)

Ruth Handler


B)

John Harington


C)

Rowland Hill


D)

Felix Hoffmann



Correct Answer :

Felix Hoffmann


Explanation :

Felix Hoffmann, a German chemist,produced a stable form of acetylsalicylic acid, more commonly known as aspirin, in 1897. Aspiring is used to reduce fever and relieve mild to moderate pain from conditions such as muscle aches, toothaches, common cold, and headaches.

6CO2 + 6H2O + Light ---> C6H12O6 + 6O2
The above equation depicts ?

A)

Rusting


B)

Painting


C)

Burning


D)

Photosynthesis



Correct Answer :

Photosynthesis


Explanation :

Plants capture the energy from the Sun by a chemical process called photosynthesis. The product of photosynthesis is the carbohydrate glucose and oxygen which is released into the atmosphere.

The number of atoms present in the molecule of an element is known as its?

A)

Atomic number


B)

Molecular mass


C)

Atomicity


D)

Atomic mass



Correct Answer :

Atomicity


Explanation :

Atomicity is defined as the total number of atoms that constitute a molecule. For example, each molecule of oxygen (O2) is composed of two oxygen atoms. So atomicity of oxygen is 2.

The cathode of a dry cell is made of ?

A)

carbon


B)

manganese


C)

graphite


D)

zine



Correct Answer :

graphite


Explanation :

A typical dry cell battery has a graphite rod at the centre, which acts as the positive electrode or cathode.

The acid present in soft drinks is ?

A)

Carbonic acid


B)

Tartaric acid


C)

Malic acid


D)

Salicylic acid



Correct Answer :

Carbonic acid


Explanation :

The three most common acids in soft drinks are citric, carbonic and phosphoric acids.

Citric acid(C6H8O7)preserves food and enhances flavor. It is one of the most useful ingredients in the food and beverage industries.

Carbonic acid(H2C03) is used to get the fizz, sour and sparkling taste.

Phosphoric acid(H3PO4) add a tangy flavor and prevents the growth of mold and bacteria.

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