Explanation

Amines are of three types, primary, secondary and tertiory.

1. Primary amines are those which directlr attached to one carbon as CH3NH2 or RNH2.
2. Secondary amines are those which attached to two more carbon atoms as C2H5 − NH − C2H5 or R2NH
3. Tertiory amines all valency of nitrogen are satisfied by alkyl groupe R3N.

Explanation

Chemistry is the scientific study of the composition, properties, and reactions of matter. It deals with the analysis, synthesis, and transformation of matter, and explores the relationships between the properties of matter and its composition.

Chemistry is concerned with:

• Composition: The types and amounts of elements present in a substance.
• Properties: The characteristics of a substance, such as its color, melting point, boiling point, reactivity, and solubility.

Explanation

The d-block elements are located in the periodic table between the s-block and p-block elements and are characterized by the filling of the d subshell. These elements are known as transition elements or transition metals.

Explanation

• An oxidation number (also known as oxidation state) is a number assigned to an atom or ion in a compound that represents its degree of oxidation, or its hypothetical charge if all its bonds were ionic.
• It is a way to keep track of the number of electrons gained or lost by an atom in a chemical reaction.

Explanation

• When equal masses of methane (CH4) and oxygen (O2) are mixed, the number of moles of each gas is equal. Since the molar mass of methane (16 g/mol) is smaller than that of oxygen (32 g/mol), the number of molecules of methane is greater than the number of molecules of oxygen.
• Let's calculate the fraction of total pressure exerted by oxygen:
• Number of moles of methane = Number of moles of oxygen (since equal masses are mixed)
• Molar ratio of methane to oxygen = 1:1
• Total pressure = Partial pressure of methane + Partial pressure of oxygen = 1 (due to methane) + 1 (due to oxygen) = 2
• Fraction of total pressure exerted by oxygen = Partial pressure of oxygen / Total pressure = 1 / 2 = 2/3

Explanation

• Atoms having same atomic number but different atomic mass, are known as isotopes.
• The difference in the mass is due to the difference in their number of neutrons with the same number of electrons and protons.

Explanation

• Ethylene bromide (C2H4Br2) is a compound that was formerly used as a scavenger in leaded gasoline to prevent the formation of lead oxide and lead sulfate deposits in engines. It reacted with the lead compounds to form a volatile lead bromide, which was then exhausted out of the engine.
• The use of leaded gasoline and ethylene bromide as a scavenger has largely been phased out due to environmental and health concerns.

Explanation

Maltose is not a macromolecule.

Explanation

• Successive ionization energies refer to the energy required to remove electrons one by one from an atom, resulting in the formation of a series of ions with increasing charge.
• This process involves the sequential removal of electrons from an atom, with each removal requiring a specific amount of energy, known as the ionization energy.
• The term "successive" refers to the fact that the electrons are removed one by one, in a specific order, with each removal building on the previous one.

Explanation

• Lemons contain citric acid, which is a naturally occurring compound that gives lemons their characteristic sour taste.
• Citric acid is a weak organic acid that is found in many fruits, including lemons, oranges, and grapefruits.
• It is responsible for the tartness and acidity of these fruits.