Free Periodic Properties and Trends MCQs with Answers
606 Periodic Properties and Trends MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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606 questions · page 13 of 31
- A. Only alkali metals
- B. Only transition elements
- C. Only noble gases
- D. None of the above
Explanation: Non-stoichiometric compounds are formed by transition elements because they show variable oxidation states and defects in crystal…
Correct answer: Only transition elements- A. 3, 11, 19, 37
- B. 5, 13, 21, 39
- C. 7, 15, 31, 49
- D. 5, 13, 31, 49
Explanation: Group 13 begins with Boron (Z=5). The atomic numbers of subsequent elements are found by adding 8, 18, 18, etc.
Correct answer: 5, 13, 31, 49- A. Group 1 (IA)
- B. Group 13 (IIIA)
- C. Group 3 (IIIB)
- D. Group 18 (Zero Group)
Explanation: Group 3 is unique because it contains not only the four d- block elements (Sc, Y, Lu, Lr) but also serves as the placeholder for the two…
Correct answer: Group 3 (IIIB)- A. Increasing atomic number
- B. Decreasing atomic number
- C. Increasing atomic mass
- D. Decreasing atomic mass
Explanation: The modern periodic table is organized based on the Modern Periodic Law, which states that the properties of elements are a periodic…
Correct answer: Increasing atomic number- A. Mg(OH)2
- B. Ca(OH)2
- C. Sr(OH)2
- D. Ba(OH)2
Explanation: For the hydroxides of the alkaline earth metals (Group 2), solubility in water increases as you move down the group.
Correct answer: Ba(OH)2- A. MgO and NO2
- B. Mg and NO2
- C. MgO, NO2 and O2
- D. Mg(NO3)2
Explanation: Since magnesium nitrate has a high affinity for water, heating the hexahydrate does not result in the dehydration of the salt, but rather…
Correct answer: MgO, NO2 and O2- A. O2
- B. NO2
- C. O2 + NO2
- D. NaNO2 + O2
Explanation: Sodium nitrate (and potassium nitrate) upon heating decomposes to produce sodium nitrite and colorless and odourless oxygen gas.
Correct answer: NaNO2 + O2- A. Ionization energy
- B. Melting point
- C. Ionic radius
- D. Atomic radius
Explanation: Na, Mg, Al, Si are all GIANT LATTICE structures involving either metallic (Na, Mg, Al) or giant covalent macromolecule (Si) bonding.
Correct answer: Melting point- A. 12 C 6
- B. 14 N 7
- C. 16 O 7
- D. 19F 9
Explanation: EA increases (more negative value) along the period (→). But there is an exception in EA's value of N and C.
Correct answer: 14 N 7- A. Mendeleev's periodic law
- B. Newland's law of octaves
- C. Dobereiner's triads
- D. Lothar Meyer's classification
- E. Modern periodic law
Explanation: The modern Periodic law can be stated as: "The physical and chemical properties of the elements are periodic functions of their atomic…
Correct answer: Modern periodic law- A. They belong to 18th group of the modern periodic table.
- B. Except Rn, all the remaining noble gases are present in the air.
- C. These elements belong to 17th group in the IUPAC system.
- D. These are highly reactive elements.
- E. None of the above
Explanation: Noble gases are elements located in the 18th group of the modern periodic table.
Correct answer: They belong to 18th group of the modern periodic table.- A. Ortho-bromotoluene and meta-bromotoluene
- B. Meta-bromotoluene and para-bromotoluene
- C. Ortho-bromotoluene and para-bromotoluene
- D. Ortho-bromotoluene and ortho-bromotoluene
- E. Para-bromotoluene and para-bromotoluene
Explanation: The correct answer is Ortho-bromotoluene and para-bromotoluene. The methyl group (-CH3) on the benzene ring acts as an ortho-para…
Correct answer: Ortho-bromotoluene and para-bromotoluene- A. Na2B4O7.10H2O
- B. Na2B4O7.7H2O
- C. Na2B4O7.5H2O
- D. Na2B4O7.3H2O
- E. Na2B4O7.H2O
Explanation: Na2B4O7.10H2O . This is just a fact that should be recalled in the exam.
Correct answer: Na2B4O7.10H2O- A. s-block
- B. p-block
- C. d-block
- D. f-block
- E. None of the above
Explanation: The d-block elements are the outer transition elements as opposed to the f-block, which are the inner transition elements.
Correct answer: d-block- A. Their bond energy is low
- B. They easily absorb energy
- C. Splitting of the five degenerate d-orbitals take place
- D. The d-orbitals are very close to p-orbitals
- E. Degenerate p-orbitals are present
Explanation: The reason why transition metals, in particular, are colorful is that they have unfilled or half-filled d orbitals.
Correct answer: Splitting of the five degenerate d-orbitals take place- A. S block elements
- B. P block elements
- C. D block elements
- D. Noble gases
Explanation: At the end of the periodic table noble gases are found as shown below:
Correct answer: Noble gases- A. None of these
- B. CI2
- C. O2
- D. N2
- E. Na
Explanation: Chlorine gas does react with calcium oxide (CaO) to form calcium chloride (CaCl2):Cl2 + CaO → CaCl2But it doesnot react with NaHCO3
Correct answer: CI2- A. It is a covalent compound
- B. It is a gas with bad smell
- C. It is a stronger reducing agent than H2O
- D. It is a weak base in water
Explanation: H2S acts as weak acid in water, not as a weak base. In H2S, the influence of the nucleus is less and hence, it can give away its electrons.
Correct answer: It is a weak base in water- A. Ca
- B. Na
- C. Be
- D. Mg
Explanation: Ionization potential or ionisation potential is the amount of energy required to remove an electron from an isolated gaseous atom to form…
Correct answer: Be- A. Na
- B. Ca
- C. Mn
- D. F
- E. Ne
Explanation: The first ionization of an element refers to the amount of energy needed to remove one electron from an atom.
Correct answer: Na