General Knowledge

Chemistry - Section 1

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Chemistry - Section 1

Practice and master this topic with our carefully crafted questions.

10 Questions
15 Minutes
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Question 21
The metal that is usually extracted from sea water is
A
Ca
B
Na
C
K
D
Mg
Correct Answer: Option D

No answer description available for this question.

Question 22
The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

A
liquation
B
leaching
C
levigation
D
magnetic separation
Correct Answer: Option C

No answer description available for this question.

Question 23
The inert gases are ____ in water

A
sparingly soluble
B
insoluble
C
soluble
D
None of these
Correct Answer: Option A

No answer description available for this question.

Question 24
The molecular formula of phosphorous is

A
P1
B
P2
C
P3
D
P4
Correct Answer: Option D

No answer description available for this question.

Question 25
The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of

A
atomic structure
B
metallurgy
C
periodic table of contents
D
discovery of elements
Correct Answer: Option C

No answer description available for this question.

Question 26
The method that cannot be used for removing permanent hardness of water is

A
adding sodium carbonate
B
distillation
C
adding caustic soda
D
boiling
Correct Answer: Option D

No answer description available for this question.

Question 27
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

A
3 billion years
B
100 years
C
0.01 minute
D
13 days
Correct Answer: Option C

No answer description available for this question.

Question 28
The gas used for artificial ripening of green fruit is

A
ethylene
B
ethane
C
carbon dioxide
D
acetylene
Correct Answer: Option A

No answer description available for this question.

Question 29
Zone refining is used for the purification of

A
Au
B
Ge
C
Ag
D
Cu
Correct Answer: Option B

No answer description available for this question.

Question 30
The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

A
cineole
B
engenol
C
geraniol
D
limonene
Correct Answer: Option A

No answer description available for this question.

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