Chemistry Quiz - General Knowledge Questions and Answers

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Which of the following fibers are made of polyamides?/निम्नलिखित फ़ाइबर में से कौन से पॉली एमाईड से बना होता है?

Decron/डेकेरान
Orlon/ ओर्लन
Nylon/ नाइलॉन
Rayon/ रेयॉन


Correct Answer :Nylon/नाइलॉन

Natural rubber is polymer of?

A)

Isoprene


B)

Styrene


C)

Vinyl acetate


D)

Propene



Correct Answer :

Isoprene


Explanation :

Natural Rubber is a polymer of Isoprene represented as CH2=C(CH3)—CH=CH2 (2-Methyl -1, 3 – Butadiene).

Natural Rubber is mainly obtained in the form of latex from rubber tree. Latex is a sticky, milky fluid that is refined in rubber ready for commercial processing.

Because of its elasticity, flexibility and toughness, rubber is widly used in commercial and daily applications, for example tires, toys, vehicles, shoes, clothes, furniture, aircraft and bicycles.

The properties of Natural rubber can be improved by a process called Vulcanization.The Vulcanization is the process of heating raw rubber with Sulphur.

Thailand is the leading Rubber producing country in the world. Indonesia is the second where India is ranked fourth or fifth in Rubber production.

Water has maximum density at which temperature?

A)

100oC


B)

0oC


C)

4oC


D)

273oC



Correct Answer :

4oC


Explanation :

When cooled to room temperature, liquid water becomes increasingly dense, just like other substances, but approximately 4 °C (39 ° F) pure water reaches its maximum density. As it is further cooled, it becomes less dense.

Bleaching Powder is a compound of?

A)
Sodium

B)
Calcium

C)
Magnesium

D)
Potassium


Correct Answer :

Calcium


Explanation :

Bleaching Powder (Calcium hypochlorite) is a chemical compound with formula Ca(ClO)2. the chemical formula of bleaching powder is CaOCl2 .
Preparation
Ca(OH)2 + Cl2 → Ca (OCl)Cl + H2O
It is used for water treatment and as a bleaching agents for cotton and linen in the textile industry.

Which of the following elements is used for the bleaching process?

A)
Fluorine

B)
Bromine

C)
Chlorine

D)
Xenon


Correct Answer :

Chlorine


Explanation :

Chlorine is a pure chemical element, a green-yellow gas that easily combines with most other elements and present in many bleach compounds.

Which of the following elements is a metal?/ निम्न में से कौन­सा तत्व एक धातु है ?

S
Se
I
Ga


Correct Answer :Ga

In which of the following elements is not included in structural elements:/ निम्न मे से कौन­सा तत्व संरचनात्मक तत्वों में नही आता?

Carbon/ कार्बन
Oxygen/ ऑक्सीजन
Nitrogen/ नाइट्रोजन
All are structural elements/ सभी संरचनात्मक तत्व है


Correct Answer :All are structural elements/ सभी संरचनात्मक तत्व है

Chlorophyll is a naturally occurring chelate compound in which central metal is:/ क्लोरोफिल एक प्राकतिक चीलेट है , इसके केंद्र मे कौन­सी धातु होती है ?

Copper/ तांबा
Magnesium/ मैग्नीशियम
Iron/ लोहा
Calcium/ कैल्शियम


Correct Answer :Magnesium/ मैग्नीशियम

Curding of milk in the stomach is due to the action of?

A) Pepsin
B) Renin
C) HCl
D) Tenin

Correct Answer :Renin

The blood coming out of lungs is richer than that entering into lungs in ?

A) CO2
B) O2
C) Both
D) None of these

Correct Answer :CO2

Which of the following can bring down the body temperature?

A)
Aspirin

B)
Chloroquine

C)
Penicillin

D)
Quinine


Correct Answer :

Aspirin

Both temporary and permanent hardness is removed on boiling water with?

A)
Ca(OH)2

B)
Na2CO3

C)
CaCO3

D)
CaO


Correct Answer :

Na2CO3


Explanation :

Sodium carbonate, Na2CO3, is also known as washing soda. It can remove temporary and permanent hardness from water.

The carbonate ions from sodium carbonate react with the calcium and magnesium ions in the water to produce insoluble precipitates.The water is softened because it no longer contains dissolved calcium ions and magnesium ions.

The general formula for an alcohol will be?

A)
CnH2nO

B)
CnH2n+1O

C)
CnH2n+2O

D)
CnH2nO2


Correct Answer :

CnH2n+2O

A sample of water which does not give foam with soap is known as ?

A)
Saline water

B)
Heavy water

C)
Hard water

D)
Distilled water


Correct Answer :

Hard water

The highest and the lowest value range of PH scale are?

A)
14,0

B)
7,1

C)
14, -1

D)
14, -14


Correct Answer :

14,0


Explanation :

pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity.
The solution with lowest pH value (to the left of pH scale) will be the strongest acid while the solution with highest pH value (to the right of pH scale) will be the strongest base.

Usually the range of a pH scale is 0−14 . Strongest acid has pH of 1 while strongest base has pH of 14. (0 - 6.99 are acids. 7 is neutral. 7.1 - 14 are bases.)

What is the permissible range of pH for drinking water as per the Indian standards?

A)
6 to 9

B)
6.5 to 7.5

C)
6 to 8.5

D)
6.5 to 8.5


Correct Answer :

6.5 to 7.5

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