NEET UG CHEMISTRY Multiple Choice Questions (MCQs)

MCQs - Inorganic Chemistry: Classification of Elements and Periodicity in Properties

121. Which of the following is true for the modern periodic law?
     a) The properties of elements are a periodic function of their atomic masses.
     b) The properties of elements are a periodic function of their atomic numbers.
     c) The elements are arranged in a periodic table based on their densities.
     d) The atomic volume is the basis for periodic classification.
     Answer: b) The properties of elements are a periodic function of their atomic numbers.
122. Which block of elements is characterized by the filling of the outermost s-orbital?
     a) s-block
     b) p-block
     c) d-block
     d) f-block
     Answer: a) s-block
123. Which of the following is the correct order of atomic radii for elements of the same period?
     a) Increases from left to right
     b) Decreases from left to right
     c) Remains constant
     d) Increases from right to left
     Answer: b) Decreases from left to right
124. What is the trend of ionization enthalpy as we move across a period in the periodic table?
     a) It decreases
     b) It remains constant
     c) It increases
     d) It first increases and then decreases
     Answer: c) It increases
125. Which of the following elements has the largest ionic radius?
     a) Na⁺
     b) Mg²⁺
     c) Al³⁺
     d) Cl⁻
     Answer: d) Cl⁻
126. Which of the following elements exhibits multiple oxidation states?
     a) Sodium (Na)
     b) Magnesium (Mg)
     c) Iron (Fe)
     d) Calcium (Ca)
     Answer: c) Iron (Fe)
127. Which block elements are known for their variable oxidation states?
     a) s-block elements
     b) p-block elements
     c) d-block elements
     d) f-block elements
     Answer: c) d-block elements
128. The electron gain enthalpy of which of the following is most negative?
     a) Oxygen (O)
     b) Fluorine (F)
     c) Nitrogen (N)
     d) Neon (Ne)
     Answer: b) Fluorine (F)
129. Which of the following periodic trends is correctly matched with its trend?
     a) Ionization enthalpy decreases from left to right in a period.
     b) Atomic radius increases as you move down a group.
     c) Electron affinity increases from top to bottom in a group.
     d) Electronegativity decreases from left to right in a period.
     Answer: b) Atomic radius increases as you move down a group.
130. Which of the following elements has the highest first ionization enthalpy?
     a) Lithium (Li)
     b) Beryllium (Be)
     c) Fluorine (F)
     d) Oxygen (O)
     Answer: c) Fluorine (F)
131. What is the correct order of electron affinity for the following elements?
     a) F > Cl > Br > I
     b) I > Br > Cl > F
     c) Cl > F > Br > I
     d) Br > I > Cl > F
     Answer: a) F > Cl > Br > I
132. Which of the following elements belongs to the p-block and has the highest electronegativity?
     a) Oxygen (O)
     b) Nitrogen (N)
     c) Fluorine (F)
     d) Chlorine (Cl)
     Answer: c) Fluorine (F)
133. Which of the following is true about the ionization enthalpy of elements as we move down a group?
     a) It increases
     b) It remains constant
     c) It decreases
     d) It first increases and then decreases
     Answer: c) It decreases
134. Which of the following elements in Period 3 has the smallest atomic radius?
     a) Sodium (Na)
     b) Magnesium (Mg)
     c) Aluminium (Al)
     d) Argon (Ar)
     Answer: d) Argon (Ar)
135. The chemical reactivity of elements in the periodic table is primarily determined by:
     a) Atomic radius
     b) Ionization enthalpy
     c) Electronegativity
     d) All of the above
     Answer: d) All of the above

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