#1
Which of the following elements is most likely to form a cation?
Sodium
ExplanationSodium tends to lose its outer electron, forming a positively charged ion (cation).
#2
What is the charge on the nitrate ion (NO3-)?
-2
ExplanationNitrate ion carries a charge of -2 due to the presence of three oxygen atoms with a combined charge of -6 and a single positive charge.
#3
Which of the following is a polyatomic ion?
Phosphate
ExplanationPhosphate is a polyatomic ion consisting of phosphorus and oxygen atoms bonded together.
#4
What is the common name for the compound NaOH?
Sodium hydroxide
ExplanationNaOH is commonly known as sodium hydroxide, a strong base used in various industrial and laboratory processes.
#5
Which of the following is a diatomic molecule?
O2
ExplanationO2 is a diatomic molecule composed of two oxygen atoms covalently bonded together.
#6
Which of the following elements is most likely to form an anion?
Fluorine
ExplanationFluorine tends to gain an electron, forming a negatively charged ion (anion) due to its high electronegativity.
#7
Which of the following is the correct formula for the sulfate ion?
SO4^2-
ExplanationThe sulfate ion is represented by SO4^2- indicating two negative charges, derived from the combination of one sulfur atom and four oxygen atoms.
#8
What is the name of the compound with the formula BaCl2?
Barium chloride
ExplanationBarium chloride is the compound formed by the combination of barium (Ba) and chlorine (Cl2).
#9
What is the oxidation state of chlorine in the compound HClO4?
+7
ExplanationChlorine in HClO4 exhibits an oxidation state of +7 due to its electronegativity and the molecule's charge distribution.
#10
Which of the following is a characteristic of ionic compounds?
Conductivity in the solid state
ExplanationIonic compounds conduct electricity when melted or dissolved in water, owing to the movement of ions.
#11
What is the formula for the cyanide ion?
CN-
ExplanationThe cyanide ion is represented by CN- indicating a single negative charge, formed by the combination of carbon and nitrogen atoms.
#12
Which of the following is a characteristic of covalent compounds?
Solubility in water
ExplanationCovalent compounds often exhibit lower solubility in water compared to ionic compounds due to their lack of ions.
#13
In the chemical formula H2SO4, what is the oxidation state of sulfur?
+6
ExplanationSulfur in H2SO4 has an oxidation state of +6, attributed to its electronegativity and the overall charge neutrality of the molecule.
#14
What is the systematic name for the compound with the formula NH4NO3?
Ammonium nitrate
ExplanationNH4NO3 is named Ammonium nitrate, formed by the combination of ammonium (NH4+) and nitrate (NO3-) ions.
#15
In the chemical equation 2Al + 3CuSO4 → 3Cu + 2Al2(SO4)3, what type of reaction is occurring?
Displacement reaction
ExplanationThe reaction represents a displacement reaction where aluminum displaces copper from its compound, leading to the formation of aluminum sulfate and copper.
#16
What is the systematic name for the compound with the formula P4O10?
Phosphorus pentoxide
ExplanationP4O10 is named phosphorus pentoxide, formed by the combination of four phosphorus atoms and ten oxygen atoms.
#17
In the chemical formula HNO3, what is the oxidation state of nitrogen?
+5
ExplanationIn HNO3, nitrogen has an oxidation state of +5, attributed to the electronegativity of oxygen and the molecule's charge distribution.
#18
In the reaction 2H2 + O2 → 2H2O, what type of reaction is occurring?
Redox reaction
ExplanationThe reaction represents a redox reaction where hydrogen is oxidized by oxygen to form water, involving transfer of electrons.