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 141:
The reactivity of fluorine is due to?
Options:
A) its high electro negativity
B) small size of fluorine atom
C) availability of D-orbitals
D) strong f-f bond
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The correct answer is A .
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Question 142:
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 143:
Given that 15.00 cm3 of H2
SO4 was required to completely neutralize 25.00 cm3 of 0.125 mol dm-3 NaOH, calculate the molar concentration of the acid solution:
Options:
A) 0.925 mol dm-3
B) 0.156mol dm-3
C) 0.104 mol dm-3
D) 0.023 mol dm-3
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The correct answer is C .
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Question 144:
The set-up above would be useful for determining the amount of
Options:
A) oxygen in air
B) water vapour in air
C) CO2 in air
D) arygen in air
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The correct answer is B .
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Question 145:
2H2S(g) + SO2(g) + H2O(l) → 3S(s) + 3H2O(l)..........(I)
3CuO(s) + 2NH3(g) → 3Cu(s) + 3H2O(l) + N2(g).........(II)
In the equations above, the oxidizing agent (I) and the reducing agent in (II) respectively are?
Options:
A) H2S and NH3
B) SO2 and CuO
C) SO2 and NH3
D) H2S and CuO
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The correct answer is C .
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Question 146: Which of the following is NOT a true statement of the kinetic Theory of Gases?
Options:
A) The molecules move at random
B) The size of molecules is negligble as compared with the volume of gas
C) The molecular collisions are perfectly elastic
D) Every molecule has the same kinetic energy at a particular temperature
E) The average kinetic energy is proportional to the absolute temperature of the gas
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The correct answer is D .
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Question 147: The ion that may be assumed to have negligible concentration in a sample of water that lathers readily with soap is?
Options:
A) Mg+
B) K+
C) CO22-
D) HCO3
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The correct answer is C .
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Question 148: Under high pressure, real gases do not obey gas laws because their molecules?
Options:
A) have become more energetic
B) have become less energetic
C) have become smaller in size
D) decompose into atoms
E) start repelling each other
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The correct answer is B .
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Question 149: The three-dimensional shape of methane is
Options:
A) hexagonal
B) trigonal
C) linear
D) tetrahedral
E) cubical
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The correct answer is D .
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Question 150: In which of the following are water molecules in the most disorderly arrangement?
Options:
A) Ice at -10°C
B) Ice at 0°C
C) Water at 100°C
D) Steam at 100°C
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The correct answer is D .