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 161: The rate of a reaction usually decrease in the concentration of reactants because
Options:
A) kinetic energy decrease
B) temperature increase
C) speed increases
D) reactants collision decrease
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The correct answer is D .
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Question 162: The gas formed when ammonium trioxonitrate (V) is heated with sodium hydroxide is?
Options:
A) hydrogen
B) nitrogen (IV) oxide
C) oxygen
D) ammonium
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The correct answer is D .
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Question 163: The isomers of C3H8O ARE
Options:
A) 1 - propanol and 2 - propanol
B) 1 - propanol and 1 - propanol
C) 2 - propanol and 2 - propanone
D) 2 - propanol and 1 - propanol
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The correct answer is A .
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Question 164: A suitable reagent for distinguish between ethanoic and ethanol is
Options:
A) bromine water
B) Fehling’s solution
C) sodium hydrogen trioxocarbonate (iv)
D) Ammoniacal silver trioxonitrate(V)
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The correct answer is C .
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Question 165:
The diagram above represents an atom that can combine with chlorine to form
Options:
A) a covalent bond
B) an electrovalent bond
C) a hydrogen bond
D) a co-ordinate bond
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The correct answer is B .
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Question 166: The tincture of iodine means iodine dissolved in
Options:
A) ethanol
B) bromine chloride
C) chlorine water
D) water
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The correct answer is A .
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Question 167:
The molar enthalpy change accompanying the removal of an electron from a gas phase atom orion in its ground state is called?
Options:
A) Electron gain enthalpy
B) Ionization enthalpy
C) Enthalpy change
D) Enthalpic gas removal
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The correct answer is B .
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Question 168: which of these metals CANNOT replace hydrogen from alkaline solutions?
Options:
A) Aluminium
B) Zinc
C) Tin
D) Iron
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The correct answer is A .
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Question 169:
A sample of any of the following substances disappearsafter some time when exposed to air like camphor, naphthalene, or dry ice. This phenomenon is called?
Options:
A) Sublimation
B) Evaporation
C) Diffusion
D) Radiation
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The correct answer is A .
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Question 170:
117.0g of sodium chloride was dissolved in the solubility in 1.0dm3 of distilled water at 25oC. Determine the solubility in mol dm-3 of sodium chloride at that temperature
[Na = 23, Cl = 35.5]
Options:
A) 1.0
B) 2.0
C) 3.0
D) 4.0
Show Answer
The correct answer is B .