Basic chemistry GK

Basic chemistry GK

Question 1 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The main active constituent of tea and coffee is
A
nicotine
B
chlorophyll
C
caffeine
D
aspirin






Question 2 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
What are the number of moles of CO2 which contains 16 g of oxygen?
A
0.5 mole
B
0.2 mole
C
0.4 mole
D
0.25 mole
Question 2 Explanation: 
One mole of CO2 has mass of 44 g and 32 g of O2. So 16 g of O2 have 22 g of CO2 or 0.5 moles of it.
Question 3 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The number of moles of solute present in 1 kg of a solvent is called its
A
molality
B
molarity
C
normality
D
formality






Question 4 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The maximum number of isomers for an alkene with molecular formula C4H8 is
A
5
B
4
C
2
D
3
Question 5 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The most extensive, commercially useful source of thorium as monazite sand occurs in India at
A
Orissa coast
B
Travancore coast
C
West Bengal coast
D
Gujarat coast






Question 6 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The mass number of a nucleus is
A
always less than its atomic number
B
the sum of the number of protons and neutrons present in the nucleus
C
always more than the atomic weight
D
a fraction
Question 7 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The National Chemical Laboratory is situated in
A
New Delhi
B
Bangalore
C
Pune
D
Patna






Question 8 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The mineral containing both magnesium and calcium is
A
magnesite
B
calcite
C
carnallite
D
dolomite
Question 9 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The gas used in the manufacture of vanaspati from vegetable oil is
A
hydrogen
B
oxygen
C
nitrogen
D
carbon dioxide






Question 10 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
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
Question 11 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The nuclear particles which are assumed to hold the nucleons together are
A
electrons
B
positrons
C
neutrons
D
mesons






Question 12 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The hottest part of the gas flame is known as
A
luminous zone
B
dark zone
C
blue zone
D
non-luminous zone
Question 13 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The most abundant rare gas in the atmosphere is
A
He
B
Ne
C
Ar
D
Xe






Question 14 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is
A
2.05 gram
B
3.05 gram
C
4.05 gram
D
5.05 gram
Question 15 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is
A
5x/36
B
5x
C
7.2 x
D
x/6






Question 16 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The molecular formula of phosphorous is
A
P1
B
P2
C
P3
D
P4
Question 17 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The most malleable metal is
A
platinum
B
silver
C
iron
D
gold






Question 18 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
A
carbon
B
hydrogen
C
oxygen
D
nitrogen
Question 19 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The mass number of an atom is equal to
A
the number of protons
B
the number of protons and electrons
C
the number of nucleons
D
the number of neutrons






Question 20 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The formula C6H5-CO-CH3 represents
A
Acetone
B
Acetic acid
C
Acetophenone
D
Phenyl acetate
Question 21 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The inexpensive and commonly used variety of glass is called soda glass. It is called so because
A
was used initially for making bottles of soda(carbonated drink)
B
is made using soda(sodium carbonate)
C
was initially used for storing sodium carbonate
D
is made using soda lime






Question 22 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The number of waves in n x 10th Bohr's orbit are
A
n2
B
n
C
n-2
D
n3
Question 23 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The gas used for artificial ripening of green fruit is
A
ethylene
B
ethane
C
carbon dioxide
D
acetylene






Question 24 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The heat required to raise the temperature of body by 1 K is called
A
specific heat
B
thermal capacity
C
water equivalent
D
None of the above
Question 25 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The maximum number of covalent formed by nitrogen is
A
1
B
2
C
3
D
4






Question 26 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The metal used to recover copper from a solution of copper sulphate is
A
Na
B
Ag
C
Hg
D
Fe
Question 27 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The number of electrons presents in H+ is
A
zero
B
one
C
two
D
three
Question 27 Explanation: 

H+ is a hydrogen ion, and it is an ion because it LOST an electron. Electrons are negatively charged. When an atom gains electrons it will have NEGATIVE charges.

So it has zero electron.







Question 28 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The most commonly used bleaching agent is
A
alcohol
B
carbon dioxide
C
chlorine
D
sodium chlorine
Question 29 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is
A
Dalton's law
B
Gay Lussac's law
C
Henry's law
D
Raoult's law






Question 30 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The high reactivity of fluorine is due to
A
its high electro negativity
B
small size of fluorine atom
C
availability of d-orbitals
D
strong F - F bond
Question 31 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The inherited traits of an organism are controlled by
A
RNA molecules
B
nucleotides
C
DNA molecules
D
enzymes






Question 32 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The metal that is used as a catalyst in the hydrogenation of oils is
A
Ni
B
Pb
C
Cu
D
Pt
Question 33 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
The major constituent of air is
A
nitrogen
B
carbon dioxide
C
oxygen
D
hydrogen
There are 33 questions to complete.

Leave a Reply

Your email address will not be published. Required fields are marked *