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 111:
The constituent common to duralumin and alnico is
Options:
A) Co
B) Mn
C) Al
D) Mg
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The correct answer is C .
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Question 112:
Sodium reacts vigorously with water to produce
Options:
A) Sodium chloride (NaCl) and oxygen gas (O2)
B) Sodium nitrate (NaNO3) and water (H2O)
C) Sodium hydroxide (NaOH) and hydrogen gas (H2)
D) Sodium oxide (Na2O) and hydrogen gas (H2)
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The correct answer is C .
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Question 113: Which of the following gases has a characteristic pungent smell, turns red litmus paper blue and forms dense white fumes with hydrogen chloride gas?
Options:
A) N2
B) N2O
C) CI2
D) NH3
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The correct answer is D .
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Question 114: If the change in free energy of a system is -899 Jmol-1 and the entropy change is 10Jmol-1k-1 at 250C, calculate the enthalpy change.
Options:
A) +2081 Jmol-1
B) -2081 Jmol-1
C) -649 Jmol-1
D) +649 Jmol-1
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The correct answer is A .
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Question 115:
Zn + 2HCL ZnCl + H
What happens to zinc in the above reaction?
Options:
A) oxidized
B) a reactant
C) reduced
D) a metal
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The correct answer is A .
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Question 116: The solubility in moles per dm3 of 20g of CuSO4 dissolve in 100 of water at 180°C is?(Cu = 63.5, S = 32, O = 16)
Options:
A) 0.13
B) 0.25
C) 1.25
D) 2.00
Show Answer
The correct answer is C .
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Question 117: Na2C2O4 + CaCl2 → CaC2O4 + 2NaCl. Given a solution of 1.9g of sodium oxalate in 50g of water at room temperature, calculate the minimum volume of 0.1 M calcium oxalate using the above equation?
Options:
A) 1.40 χ 102 dm3
B) 14.0 χ 102 cm3
C) 1.40 χ 10-2 dm-2
D) 14.0 χ 10-2 cm3
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The correct answer is A .
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Question 118:
A binary compound of oxygen with another element is referred to as?
Options:
A) Oxide
B) Element
C) Carbon
D) Nitrogen
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The correct answer is A .
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Question 119:
A correct electrochemical series can be obtained from Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging
Options:
A) Al and Mg
B) Zn and Fe
C) Zn and Pb
D) Pb and H
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The correct answer is A .
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Question 120: Which of the following class of compounds can exist as dipolar ions in solution?
Options:
A) Alkanoic acid
B) Fatty acids
C) Dialkanoic acids
D) Amino acids
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The correct answer is D .