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Practice MCQ Questions and answers on Chemistry-GK

Learn and practice General Knowledge questions and answers on Chemistry with very easy and understandable explanations. GK questions are very helpful different type of competitive exams. Page-2 section-7

Each section contains 100 MCQs on Chemistry .
11
Commercial nitric acid is coloured because it contains dissolved :
Discuss
Answer & Solution
Answer: Option C
Solution:
Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
12
Choose the incorrect statement pertaining to organic compounds
Discuss
Answer & Solution
Answer: Option C
Solution:
Typical organic compounds are combustible by nature as they contain carbon. Organic compounds mostly consist of carbon, hydrogen, halogen, and phosphorus.
13
The gas which emits from rice field is
Discuss
Answer & Solution
Answer: Option B
Solution:
Rice paddy fields are a source of the GHGs carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O).
14
Ethylene is a ________ molecule.
Discuss
Answer & Solution
Answer: Option D
Solution:
Ethylene is a nonpolar molecule.
15
The next higher homologue of C6H14 is
Discuss
Answer & Solution
Answer: Option D
Solution:
The next higher homologue of C6H14 is C7H16.
16
The gas used for artificial fruit ripening of green fruit is –
Discuss
Answer & Solution
Answer: Option A
Solution:
Some gases can speed up the ripening process of fruits. Farmers and sellers sometimes use this to make fruits ready for sale quicker.

Out of the options given, ethylene is the gas commonly used for artificial fruit ripening. It's a natural plant hormone that triggers the ripening process. Acetylene, while similar in structure, is less commonly used for this purpose. Ethane and methane are not involved in fruit ripening.

Therefore, the correct answer is Option A: Ethylene.
17
The natural source of hydrocarbon is
Discuss
Answer & Solution
Answer: Option A
Solution:
The natural source of hydrocarbon is crude oil.
18
By which organic compound all the oils are known ?
Discuss
Answer & Solution
Answer: Option C
Solution:
Hydrocarbons are organic compounds containing carbon and hydrogen and found in crude oil and natural gas. Hydrocarbons are formed from the remains of marine animals and plants that lived in shallow inland seas, died, and drifted to the bottom. The term petroleum is used as a common denotation for crude oil (mineral oil) and natural gas, i.e., the hydrocarbons from which various oil and gas products are made.
19
Which of the following elements is found in all organic compounds?
Discuss
Answer & Solution
Answer: Option A
Solution:
The most common elements present in organic compounds are carbon, hydrogen, oxygen, and nitrogen. With carbon and hydrogen present, other elements, such as phosphorous, sulfur, silicon, and the halogens, may exist in organic compounds.
20
Ethanol containing 5% water is known as :
Discuss
Answer & Solution
Answer: Option C
Solution:
A rectified alcohol is highly concentrated ethanol which has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume and 5 % water. Normally, ethanol with 5 % water is known as pure alcohol.