CBSE Class 11 Chemistry Periodic Classification of Elements MCQs

MCQ - Choose Appropriate Alternative

Question. Which of the following pairs are chemically dissimilar?
(a) Na and K 
(b) Ba and Sr 
(c) Zr and Hf 
(d) Ca and Zn.

Question. The total number of inner transition elements is
(a) 10
(b) 14 
(c) 28
(d) 30

Question. The alkali metal which is liquid at 15^oC is
(a) K 
(b) Cs 
(c) Na 
(d) None

Question. Which of the following ion will form most water soluble hydroxide?
(a) K⁺
(b) Ni²⁺ 
(c) Zn²⁺ 
(d) Al³⁺

Question. Which of the following has greatest tendency to lose electron?
(a) F 
(b) Fr
(c) S
(d) Be.

Question. The oxide of which of the following elements will be acidic in character
(a) Mg 
(b) Rb 
(c) Li 
(d) CI

Question. Which of the following is isoelectronic with carbon atom?
(a) Na⁺ 
(b) Al³⁺ 
(c) O₂^- 
(d) N⁺

Question. Which of the following ions are paramagnetic in character?
(a) Zn²⁺ 
(b) Cu⁺ 
(c) Ni²⁺ 
(d) Ag⁺

Question. Ca²⁺ ion is isoelectronic with
(a) Mg²⁺
(b) Na⁺ 
(c) Ar 
(d) Kr

Question. Gradual addition of electronic shells in the noble gases causes a decrease in their
(a) Ionization energy 
(b) atomic radius 
(c) Boiling point 
(d) density.

Question. Which of the following has highest first ionization potential?
(a) Carbon
(b) Oxygen 
(c) Nitrogen
(c) Boron.

Question. Which of the following has the smallest size?
(a) Na⁺ 
(b) Mg²⁺ 
(c) Al³⁺ 
(d) CI

Question. Which of the following element has the maximum electron affinity?
(a) F
(b) S 
(c) I
(d) CI.

Question. Which of the following is isoelectronic as well as has the same structure as that of N₂O ?
(a) N₃H
(b) H₂O  
(b) NO₂ 
(c) CO₂

Question. The atomic radius increases as we move down a group because
(a) Effective nuclear charge increases 
(b) Atomic mass increases
(c) Additive electrons are accommodated in new electron level 
(d) Atomic number increase.

Question. Which one of the following is an incorrect statement?
(a) The ionization potential of nitrogen is greater than that of chlorine
(b) The electron affinity of fluorine is greater than that of chlorine
(c) The ionization potential of beryllium is greater than that of boron
(d) The electronegativity of fluorine is greater than that of chlorine.

Question. Electron affinity depends on
(a) Atomic size 
(b) Nuclear charge 
(c) Atomic number 
(d) Atomic size and nuclear charge both.

Question. Two elements whose eletronegativities are 1.2 and 3.0, the bond formed between them would be
(a) Ionic
(b) covalent 
(c) Coordinate
(c) metalli(c)

Question. Ionic radii are
(a) Directly proportional to square of effective nuclear charges 
(b) Inversely proportional to effective nuclear charge
(c) Inversely proportional to square of effective nuclear charge 
(d) Directly proportional to effective nuclear charge.

Question. Which of the following oxides is atmospheric in character?
(a) CaO
(b) CO₂ 
(c) SiO₂ 
(d) SnO₂

Question. Mark the correct statement:
(a) Na⁺ is smaller than Na atom
(b) Na⁺ is larger than Na atom
(c) CI^- is smaller than CI atom
(d) CI^- and CI are equal in size

Question. Who introduced the zero groups?
(a) Lothar Meyer
(b) Lockery 
(c) Mendleev
(d) Ramsay

Question. Element, of group I-B are called
(a) Representative elements 
(b) Transition elements 
(c) Rare earth 
(d) Coinage metals

Question. The element with Z = 24 is placed in the period
(a) 5
(b) 2 
(c) 3
(d) 4

Question. Which is the part of metalloids?
(a) NA and K
(b) F and CI 
(c) None of these
(d) Cu and Au

Question. Which one of the following has the maximum electron affinity?
(a) I
(b) Br 
(c) CI
(d) F

Question. On electrolysis of NaH, hydrogen is liberated
(a) At anode
(b) in the electrolyte
(c) At cathode
(d) none of them

Question. Elements with greater number of electrons have _________values of ionization energy.
(a) Only one
(b) More than one
(c) Zero
(d) Infinite

Question. Which of the following possess maximum hydration power?
(a) Na⁺
(b) K⁺
(c) Mg⁺²
(d) Ca⁺²

Question. Higher value of electron affinity means_________
(a) Atom will lose electron easily
(b) Atom will gain electron easily
(c) Atom may form di-positive ion
(d) The reason is unknown

Question. Melting points of VII-A group ___________ down the group
(a) Increase
(b) Decrease
(c) Remain constant
(d) No regular trend

Question. Oxidation state of an atom represents______
(a) No. of electrons gained
(b) No. of electrons lost
(c) No. of electrons gained or lost
(d) None of above correctly represent it

Question. Mendeleev’s periodic table was based on
(a) Atomic number
(b) Atomic mass
(c) Atomic volume
(d) Electronic configuration

Question. Elements present in a same group have the same
(a) Atomic number
(b) Molecular weight
(c) Chemical properties
(d) Electronic configuration

Question. “s” and “p” block elements are also called
(a) Transition elements
(b) Inert elements
(c) Typical elements
(d) Rare earth elements

Question. What is the symbol of the element with only three electrons and three protons?
(a) Li
(b) C
(c) Ag
(d) Cu

Question. Elements with seven electrons in their valence shell are known as
(a) Inert
(b) Lanthanides
(c) Halogens
(d) Alkali metals

Question. Which of the following pairs of elements are chemically most similar?
(a) Na and Al
(b) Cu and Cu
(c) S and F
(d) Sc and Zn

Question. A student of chemistry will identify positively the following symbols as sodium
(a) Na
(b) Mg
(c) Sd
(d) So

Question. In the periodic table each period begins with a metal, which is
(a) Most electronegative
(b) Most electropositive
(c) Less electropositive
(d) Less electronegative

Question. Which one of the following is not a coinage metal?
(a) Au
(b) Cu
(c) Ag
(d) Pd

Question. Which is the most metallic element of 2nd period?
(a) Lithium
(b) Beryllium
(c) Boron
(d) Carbon

Question. The outer most orbital involved in chemical bonding is called
(a) Molecular orbital
(b) Complete orbital
(c) Valence orbital
(d) Free orbital

Question. Elements, which form basic oxides are
(a) Electropositive
(b) Electronegative
(c) Inert
(d) None of these

Question. Which of the following has the most basic character?
(a) Na₂O
(b) MgO
(c) Al₂O₃
(d) P₂O₃

Question. Which of the following is smallest in size?
(a) K⁺¹
(b) O^-2
(c) F^-1
(d) Na⁺

Question. Ionization energy is lowest for
(a) Inert gases
(b) Halogens
(c) Alkali metals
(d) Alkaline earth metals

Question. An isotope of hydrogen is
(a) Neptunium
(b) Plutonium
(c) Thorium
(d) Tritium

Question. With respect to chlorine, hydrogen will be
(a) Electropositive
(b) Electronegative
(c) Neutral
(d) None of these

Question. Which of the following has the highest electron affinity?
(a) 1S² 2S² 2P³
(b) 1S² 2S² 2P⁶ 3S¹
(c) 1S² 2S² 2P⁵
(d) 1S² 2S² 2P⁵

Question. Excluding hydrogen and helium, the smallest elements in the periodic table is
(a) Lithium
(b) Fluorine
(c) Cesium
(d) Iodine

Question. Which halogen has the smallest electron affinity?
(a) F
(b) Cl
(c) Br
(d) I

Question. Theelementwith atomic number7islikelytohavesamepropertiestotheelementwhoseatomic number is
(a) 11
(b) 2 
(c) 15
(d) F

Question. Which of the following will have largest size?
(a) Br
(b) I -1
(c) I
(d) F

Question. In its chemical properties, calcium is most similar to
(a) Cs
(b) Cu
(c) Sc
(d) Sr

Question. Which two of the following are iso electronic with one another?
(a) Na⁺ and O
(b) Na⁺ and K⁺
(c) Na⁺ and Ne
(d) Ne and O

Question. Which of the following is a transuranic element?
(a) Americium
(b) Plutonium
(c) Neptunium
(d) All of these

Question. The hydrogen, which is present in the atmosphere of sun and stars in a large amount, is
(a) H₂
(b) H
(c) H⁺
(d) H^-

Question. Cesium and Francium are liquids above
(a) 10^oC
(b) 15^oC
(c) 20^oC
(d) 30^oC

Question. In an aqueous solution the hydrides of alkali metals are
(a) Stable
(b) Unstable
(c) No change
(d) None of these

Question. As the atomic number of the halogen increases, the halogens
(a) Lose their outermost electrons less easily
(b) Become less dense
(c) Becomes lighter in color
(d) Gain electrons less easily

Question. The electron affinity of fluorine is
(a) – 348.8 kj/mol
(b) – 337 kj/mol
(c) 337 kj/mol
(d) 348.8 kj/mol

Question. Which ionic halides have high m.p and (b)p?
(a) Fluoride
(b) Chloride
(c) Bromide
(d) Iodide

Question. Which gas is used in the making of tungsten bulb filaments?
(a) H₂
(b) N₂
(c) O₂
(d) CO₂

Question. The ionic halides in order of decreasing m.p and (b)p can be arranges as
(a) Iodide>bromide>chloride> fluoride
(b) Bromide>chloride>fluoride>iodide
(c) Chloride>bromide>iodide>fluoride
(d) Fluoride>chloride>bromide>iodide

Question. A hydride ion and helium atom has same number of
(a) Protons
(b) Neutrons
(c) Electrons
(d) All of these

Question. Ionic hydrides are also called
(a) Saline hydrides
(b) Salt like hydrides
(c) Both a & b
(d) None of these

Question. The hydrides are acts as powerful reducing agents are
(a) Ionic
(b) Covalent
(c) Interstitial
(d) Complex

Question. The hydrides which are non stoichiometric in nature are
(a) Ionic
(b) Covalent
(c) Interstitial
(d) Complex

Question. Which one is the example of complex hydride?
(a) PH₃
(b) NaH
(c) LaH₃
(d) NaBH₄

Question. The adsorption of hydrogen by platinum is known as
(a) Hydrogenation
(b) Dehydrogenation
(c) Occlusion
(d) Substitution

Question. From left to right in a periodic table charge to mass ratio increases therefore the hydration energy
(a) Decreases
(b) Increases
(c) Remains constant
(d) None of these

Question. ______ elements have been discovered so far.
(a)100
(b) 110
(c) 120
(d) 150

Question. _______ classified the then known elements into metals, non metals and their derivatives.
(a) Dobreiner
(b) Al – Razi
(c) Newlands
(d) Mendeleeve

Question. Dobreiner’s work led to the law of triads which states that ______
(a) Atomic weight of any one element was found to be approximately the mean of the other two elements of tria(d)
(b) Atomic weight of the middle element was found to be approximately the mean of the other two elements of a tria(d)
(c) Atomic number of any one element was found to be approximately the mean of the other two elements of a tria(d)
(d) Atomic number of the middle element was found t be approximately the mean of the other two elements of a tria(d)

Question. The law of octaves was given by _______
(a) Dobreiner
(b) Al – Razi
(c) Newlands
(d) None of these

Question. Law of octave states that ______
(a) The properties of every 6th element from the given one were similar to the first.
(b) The properties of every 9th element from the given one were similar to the first.
(c) The properties of every 8th element from the given one were similar to the first.
(d) The properties of every 7th element from the given one were similar to the secon(d)

Question. Mendeleev’s Periodic Table was based on _______
(a) Atomic number
(b) Atomic mass
(c) Atomic volume
(d) Electronic configuration

Question. Moseley’s work led to the periodic law, which states that _______
(a) The number of the electrons in the 1st energy level increases as the atomic number increases.
(b) The properties of the elements are a periodic function of their atomic mass.
(c) The x – rays spectra of the elements are more complex than the optical spectr(a)
(d) The properties of elements are the periodic function of their atomic number.

Question. A pair of elements in the same family in the periodic table classification is ________
(a) Chlorine and carbon
(b) Calcium and aluminum
(c) Nitrogen and neon
(d) Sodium and potassium

Question. In the period, the elements are arranged in strict sequence in order of _______
(a) Increasing charges in the nucleus.
(b) Increasing atomic weights.
(c) Increasing number of electrons in valence shell.
(d) Increasing valency.

Question. Uranium is a member of
(a) s – block
(b) p – block
(c) d – block
(d) f – block

Question. How many ionization energies can carbon have?
(a) 1
(b) 2
(c) 4
(d) 6

Question. Which ion has the maximum polarization power?
(a) L⁺
(b) Mg ²⁺
(c) Al ³⁺
(d) O ^2-

Question. Which of the following halides is not oxidized by MnO₂?
(a) F
(b) Cl^-
(c) Br
(d) I

Question. The process requiring absorption of energy is
(a) F → F
(b) Cl → Cl
(c) O → O²
(d) H → H

Question. Most of the known elements are metals of ______ of periodic table.
(a) d – block
(b) p – block
(c) III – group
(d) Zero block

Question. The volume in cubic centimeters occupied by one gram atom of the element is called
(a) Atomic volume
(b) Atomic weight
(c) Mass number
(d) None

Question. The lowest ionization energies are found in the
(a) Inert gases
(b) Alkali metals
(c) Transition elements
(d) Halogens

Question. The unit of ionization energy is _______
(a) Joule
(b) Calorie
(c) Electron volt
(d) None