General Knowledge
CHEMISTRY MCQs
Total Questions : 1203
| Page 2 of 121 pages
Answer: Option C. -> Pune
National Chemical Laboratory (CSIR-NCL), Pune, established in 1950, is a constituent laboratory of Council of Scientific and Industrial Research (CSIR).
National Chemical Laboratory (CSIR-NCL), Pune, established in 1950, is a constituent laboratory of Council of Scientific and Industrial Research (CSIR).
Answer: Option C. -> 1 : 16 : 2
Convert the mass into moles (use the formula n=m/Mr)
m = mass and Mr = Molecular weights
Molecular weights are 32(Oxygen), 2(Hydrogen), and 16(Methane), respectively.
Since the masses are equal, you can take the mass as x. So, the number of moles would be:
n(O2) = x/32
n(H2) = x/2
n(CH4) = x/16
The ratio of their volumes is (O2) : (H2) : (CH4) = 1 : 16 : 2
Convert the mass into moles (use the formula n=m/Mr)
m = mass and Mr = Molecular weights
Molecular weights are 32(Oxygen), 2(Hydrogen), and 16(Methane), respectively.
Since the masses are equal, you can take the mass as x. So, the number of moles would be:
n(O2) = x/32
n(H2) = x/2
n(CH4) = x/16
The ratio of their volumes is (O2) : (H2) : (CH4) = 1 : 16 : 2
Answer: Option C. -> Acetophenone
The formula C6H5-CO-CH3 represents Acetophenone.
The formula C6H5-CO-CH3 represents Acetophenone.
Answer: Option D. -> 4
Covalency of an atom in a covalent compound is the number of covalent bonds formed by an atom. Maximum covalency of Nitrogen is 4 (example - ammonium ions).
Covalency of an atom in a covalent compound is the number of covalent bonds formed by an atom. Maximum covalency of Nitrogen is 4 (example - ammonium ions).
Answer: Option C. -> the number of nucleons
The mass number of an atom is equal to the number of nucleons.
The mass number of an atom is equal to the number of nucleons.
Answer: Option D. -> Teflon
The modern non-stick pans were made using a coating of Teflon (polytetrafluoroethylene or PTFE).
The modern non-stick pans were made using a coating of Teflon (polytetrafluoroethylene or PTFE).
Answer: Option C. -> Teflon
The modern non-stick pans were made using a coating of Teflon (polytetrafluoroethylene or PTFE). PTFE was invented serendipitously by Roy Plunkett in 1938, while working for a joint venture of the DuPont company.
The modern non-stick pans were made using a coating of Teflon (polytetrafluoroethylene or PTFE). PTFE was invented serendipitously by Roy Plunkett in 1938, while working for a joint venture of the DuPont company.
Answer: Option C. -> Cotton
Cotton is the fibre that is least prone to catch fire. There are many other such fibres but cotton tops the list here. Cotton is natural fibre which is polymer of glucose. cotton helps to prevent on catching fibre. That's why our parents use cotton clothes in kitchen.
Cotton is the fibre that is least prone to catch fire. There are many other such fibres but cotton tops the list here. Cotton is natural fibre which is polymer of glucose. cotton helps to prevent on catching fibre. That's why our parents use cotton clothes in kitchen.
Answer: Option C. -> Polyvinyl Chloride
Polyvinyl chloride (PVC) is a common, strong but lightweight plastic that is used in making tough plastic. It is used for flexible applications such as insulating cables. It is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.
Polyvinyl chloride (PVC) is a common, strong but lightweight plastic that is used in making tough plastic. It is used for flexible applications such as insulating cables. It is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.
Answer: Option B. -> Cotton
Cotton is the fibre that is least prone to catch fire. There are many other such fibres but cotton tops the list here. Cotton is natural fibre which is polymer of glucose. cotton helps to prevent on catching fibre. That's why our parents use cotton clothes in kitchen.
Cotton is the fibre that is least prone to catch fire. There are many other such fibres but cotton tops the list here. Cotton is natural fibre which is polymer of glucose. cotton helps to prevent on catching fibre. That's why our parents use cotton clothes in kitchen.
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