Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.
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Question 121:
What is the name of the process by which ammonia is produced on an industrial scale?
Options:
A) Nitrogenation
B) Ammoniation
C) Nitrification
D) Haber process
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The correct answer is D .
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Question 122: Cr2O7 + 6Fe2+ + 14H+ → 2Cr3+ +6Fe3+ + 7H2O. In the above , the oxidation number of chromium changed from?
Options:
A) +7 to +3
B) +6 to +3
C) +5 to +3
D) -2 to +3
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The correct answer is A .
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Question 123:
Which of the following describes the chemical property of acids?
Options:
A) None of the above
B) Acid + XCO Salt + HO + NH
C) Acid + NaOH Normal salt + CO
D) Acid + XCO Salt + HO + CO
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The correct answer is D .
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Question 124:

Choose the correct option from the graph above.
3Fe(S) + 4H2O(g) ⇌ Fe3O4(s) + 4H2(g). The equilibrium constant, K, of the reaction above is represented as
Options:
A) A
B) B
C) C
D) D
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The correct answer is C .
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Question 125: Which of these properties gives a solid its definite shape?
Options:
A) strong intermolecular attraction
B) high melting point
C) high boiling point
D) weak intermolecular attraction
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The correct answer is A .
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Question 126: Sodium carbonate crystals on exposure to a dry atmosphere change to a white powder. This phenomenon is known as?
Options:
A) deliquescence
B) hygroscopy
C) oxidation
D) efforescence
E) sublimation
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The correct answer is D .
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Question 127:
Which of the following statements is true regarding the melting and boiling points of pure substances?
Options:
A) The boiling point is always higher than the melting point
B) The melting point is always higher than the boiling point
C) The melting and boiling points are always the same for all substances
D) The melting and boiling points can vary depending on the substance
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The correct answer is D .
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Question 128:
Why is water often referred to as the "universal solvent"?
Options:
A) Water is the most abundant substance on Earth
B) Water is essential for all living organisms.
C) Water is involved in many chemical reactions
D) Water can dissolve a wide variety of substances due to its polar nature
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The correct answer is D .
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Question 129:
Which of the following metals is commonly alloyed with copper to make brass?
Options:
A) Iron
B) Nickel
C) Aluminum
D) Zinc
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The correct answer is D .
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Question 130: Certain useful waxes are composed mainly of
Options:
A) amino acids
B) glycerols
C) alkanols
D) alkanoates
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The correct answer is B .