Chemistry Test 1 General Science Aptitude
Chemistry Test 1 General Science Aptitude
Question 11
Marsh gas mainly contains ______?
Marsh gas is primarily methane ($CH_4$).
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Question 12
Carbon occurs in nature in the purest form as ____?
Diamond is the purest crystalline form of carbon.
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Question 13
What is the Air?
Air is a mixture of gases like nitrogen, oxygen, carbon dioxide, and others.
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Question 14
First organic chemical to be synthesized in the laboratory _____?
Urea was the first organic compound synthesized by Friedrich Wöhler in 1828.
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Question 15
The most abundant element in the earth's crust is _____?
Oxygen makes up nearly 46% of the earth's crust by weight.
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Question 16
What is the only element that normally has no neutrons?
The most common isotope of hydrogen ($^1H$) has no neutrons.
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Question 17
Which of these is not a noble gas?
Hydrogen is not a noble gas; it is a reactive element.
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Question 18
What is the main component of biogas and natural gas?
Methane ($CH_4$) is the main component of both biogas and natural gas.
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Question 19
Which one of the following is the softest?
Sodium is the softest among the listed metals.
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Question 20
Which of the following has the same atomic number and atomic weight?
Protium ($^1_1H$) has an atomic number of 1 and mass number of 1.
Not clear enough?
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